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Comparative Evaluation of Chemical and Physical Expansive Agents in Cemented Paste Backfill:Expansion Behavior,Mechanical Response,and Microstructural Mechanisms 认领 引用
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作者 Lijie Guo Mengyuan Li +3 位作者 Xiaoming Wei Andrew Pan Xiaopeng Peng Tingting Ren 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期928-939,共12页
This study presents an assessment of four representative expansive additives—calcium sulphoaluminate-calcium oxide,magnesium oxide,sodium lauryl sulfate,and sodium abietate—and their effects on the expansion behavio... This study presents an assessment of four representative expansive additives—calcium sulphoaluminate-calcium oxide,magnesium oxide,sodium lauryl sulfate,and sodium abietate—and their effects on the expansion behavior,mechanical development,and microstructural characteristics of cemented paste backfill(CPB).A series of backfill mixtures containing different expansive agent types and dosages were prepared to examine their volumetric response during mixing and early hydration,uniaxial compressive strength(UCS)evolution at various curing ages,and corresponding microstructural features.The results reveal that the two physical foaming agents generated substantial instantaneous expansion during mixing,with sodium lauryl sulfate and sodium abietate reaching total relative expansion ratios of 24.38%and 10.73%at 3 days,respectively.In contrast,magnesium oxide and expansive cement produced delayed but stable expansion associated with hydration reactions.Strength testing showed strong type-dependent behavior:mixtures containing magnesium oxide or sodium abietate consistently achieved higher UCS values across all curing ages,whereas those with sodium lauryl sulfate or expansive cement exhibited significant strength reduction.Microstructural analysis further demonstrated that sodium abietate promoted a dense and continuous hydration network without the formation of interconnected pores,whereas expansive cement produced a dispersed and more porous matrix.Integrating the expansion,strength,and microstructural results shows that sodium abietate offers the most favorable balance between controlled expansion and mechanical performance,making it a promising additive for improving roof-contact efficiency and long-term structural stability in underground backfilling.The findings provide scientific support for the rational selection and optimized application of expansive agents in CPB. 展开更多
关键词 backfill-roof contacting cemented paste backfill expansive additives tailings underground mining
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Experimental investigation on mechanical properties of backfill–rock composite structure under in-situ mining and filling stress loading 认领 引用 被引量：1
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作者 Hongjian Lu Chao Mou +7 位作者 Lang Liu Sheng Li Yanbo Zhang Deqing Gan Youzhi Zhang Zhiyi Liu Zhenlin Xue Zhiguo Wang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第7期2129-2142,I0001-I0009,共14页
Backfill-rock composite structures(BRCSs)are crucial for the stability of underground mining areas.However,during the mining and backfilling cycles,they are subjected to coupled dynamic-static loading.Herein,to system... Backfill-rock composite structures(BRCSs)are crucial for the stability of underground mining areas.However,during the mining and backfilling cycles,they are subjected to coupled dynamic-static loading.Herein,to systematically investigate the mechanical properties of BRCSs under in situ mining and filling stress loading,true triaxial dynamic-static tests were conducted.First,the effects of the depth,cement-tailings(C/T)ratio by mass,and interfacial angle(IA)on the composite strength,deformation characteristics,and failure modes were systematically investigated.Subsequently,the evolution of acoustic emission(AE)signal parameters during BRCS failure was analyzed.Finally,a damage constitutive model was established based on the AE energy analysis.With increasing depth,C/T ratio,and I A,the peak strength and elastic modulus of the BRCS exhibited an upward trend,and the strain during the loading-unloading disturbance stages correspondingly increased.At a C/T ratio of 1:8,the specimens exhibited a rock-dominated load-carrying capacity with distinct brittle failure.Conversely,at a C/T ratio of 1:4,the specimens demonstrated a coupled backfill-rock load-carrying capacity,exhibiting ductile failure in the shallow regions and a transition to brittle failure in the deeper zones.AE signals were concentrated during loading-unloading disturbance,plastic yielding,and failure stages.The dominant failure mode was tensile-shear composite fracture,with the proportion of shear cracks gradually increasing with depth.The damage evolution process of a BRCS can be divided into three stages:initial,accelerated,and ultimate failures.This study provides an important theoretical basis and practical guidance for optimizing C/T ratio and enhancing stability assessment in backfilled mine designs. 展开更多
关键词 backfill mining backfill-rock composite structure mechanical properties true triaxial dynamic-static loading acoustic emis-sion characteristics
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Stability of base-exposed backfill roof considering interfaces between adjacent drifts in underhand drift-and-fill mining 认领 引用 被引量：2
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作者 Qinghai Ma Guangsheng Liu +2 位作者 Xiaocong Yang Lijie Guo Andy Fourie 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期214-229,共16页
Stability of base-exposed backfill roof in underhand drift-and-fill mining is crucial for the safety of those working beneath.Given the commonly used primary-and-secondary mining sequence,interfaces are formed between... Stability of base-exposed backfill roof in underhand drift-and-fill mining is crucial for the safety of those working beneath.Given the commonly used primary-and-secondary mining sequence,interfaces are formed between adjacent filled drifts,which can weaken the integrity of the backfill roof.These interfaces also lead to two common drift layouts:aligned drifts and staggered drifts.However,less attention has been paid to the interfaces and the two drift layouts were not adequately distinguished in previous studies.In this paper,the interfaces between filled drifts were firstly considered to investigate the stability of backfill roof.Failure modes and strength requirements of backfill roof in aligned and staggered drifts are comprehensively investigated by FLAC3D,with a focus on considerations of varied shear parameters of the interfaces.Results show that failure modes in aligned drifts transition from block sliding to top caving,bottom caving or sloughing as the interface cohesion increases from zero to at least half of the backfill cohesion.Further increases in interface cohesion allow aligned drifts to behave as if there are no interfaces between them.The critical stability conditions of backfill roof in aligned drifts were mostly determined by the interface strength instead of the backfill strength.However,the stability of backfill roof in staggered drifts is barely affected by the interface strength.The outcomes are expected to provide references for mining engineers to optimize drift layouts and perform cost-effective backfill roof strength design at mines using underhand drift-and-fill mining method. 展开更多
关键词 Base-exposed backfill Interface Failure mode Strength requirement Underhand drift-and-fill mining
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Multi-scale quantitative study on cemented tailings and waste-rock backfill under different loading rates 认领 引用 被引量：1
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作者 YIN Sheng-hua CHEN Jun-wei +4 位作者 YAN Ze-peng ZENG Jia-lu ZHOU Yun YANG Jian ZHANG Fu-shun 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期357-374,共18页
The development of metallic mineral resources generates a significant amount of solid waste,such as tailings and waste rock.Cemented tailings and waste-rock backfill(CTWB)is an effective method for managing and dispos... The development of metallic mineral resources generates a significant amount of solid waste,such as tailings and waste rock.Cemented tailings and waste-rock backfill(CTWB)is an effective method for managing and disposing of this mining waste.This study employs a macro-meso-micro testing method to investigate the effects of the waste rock grading index(WGI)and loading rate(LR)on the uniaxial compressive strength(UCS),pore structure,and micromorphology of CTWB materials.Pore structures were analyzed using scanning electron microscopy(SEM)and mercury intrusion porosimetry(MIP).The particles(pores)and cracks analysis system(PCAS)software was used to quantitatively characterize the multi-scale micropores in the SEM images.The key findings indicate that the macroscopic results(UCS)of CTWB materials correspond to the microscopic results(pore structure and micromorphology).Changes in porosity largely depend on the conditions of waste rock grading index and loading rate.The inclusion of waste rock initially increases and then decreases the UCS,while porosity first decreases and then increases,with a critical waste rock grading index of 0.6.As the loading rate increases,UCS initially rises and then falls,while porosity gradually increases.Based on MIP and SEM results,at waste rock grading index 0.6,the most probable pore diameters,total pore area(TPA),pore number(PN),maximum pore area(MPA),and area probability distribution index(APDI)are minimized,while average pore form factor(APF)and fractal dimension of pore porosity distribution(FDPD)are maximized,indicating the most compact pore structure.At a loading rate of 12.0 mm/min,the most probable pore diameters,TPA,PN,MPA,APF,and APDI reach their maximum values,while FDPD reaches its minimum value.Finally,the mechanism of CTWB materials during compression is analyzed,based on the quantitative results of UCS and porosity.The research findings play a crucial role in ensuring the successful application of CTWB materials in deep metal mines. 展开更多
关键词 cemented backfill waste rock loading rate multi-scale analysis mercury intrusion porosimetry pore structure micromorphology
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Precise and non-destructive approach for identifying the real concentration based on cured cemented paste backfill using hyperspectral imaging 认领 引用 被引量：2
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作者 Qing Na Qiusong Chen Aixiang Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第1期116-128,共13页
Cemented paste backfill(CPB)is a technology that achieves safe mining by filling the goaf with waste rocks,tailings,and other materials.It is an inevitable choice to deal with the development of deep and highly diffic... Cemented paste backfill(CPB)is a technology that achieves safe mining by filling the goaf with waste rocks,tailings,and other materials.It is an inevitable choice to deal with the development of deep and highly difficult mines and meet the requirements of environmental protection and safety regulations.It promotes the development of a circular economy in mines through the development of lowgrade resources and the resource utilization of waste,and extends the service life of mines.The mass concentration of solid content(abbreviated as“concentration”)is a critical parameter for CPB.However,discrepancies often arise between the on-site measurements and the pre-designed values due to factors such as groundwater inflow and segregation within the goaf,which cannot be evaluated after the solidification of CPB.This paper innovatively provides an in-situ non-destructive approach to identify the real concentration of CPB after curing for certain days using hyperspectral imaging(HSI)technology.Initially,the spectral variation patterns under different concentration conditions were investigated through hyperspectral scanning experiments on CPB samples.The results demonstrate that as the CPB concentration increases from 61wt%to 73wt%,the overall spectral reflectance gradually increases,with two distinct absorption peaks observed at 1407 and 1917 nm.Notably,the reflectance at 1407 nm exhibited a strong linear relationship with the concentration.Subsequently,the K-nearest neighbors(KNN)and support vector machine(SVM)algorithms were employed to classify and identify different concentrations.The study revealed that,with the KNN algorithm,the highest accuracy was achieved when K(number of nearest neighbors)was 1,although this resulted in overfitting.When K=3,the model displayed the optimal balance between accuracy and stability,with an accuracy of 95.03%.In the SVM algorithm,the highest accuracy of 98.24%was attained with parameters C(regularization parameter)=200 and Gamma(kernel coefficient)=10.A comparative analysis of precision,accuracy,and recall further highlighted that the SVM provided superior stability and precision for identifying CPB concentration.Thus,HSI technology offers an effective solution for the in-situ,non-destructive monitoring of CPB concentration,presenting a promising approach for optimizing and controlling CPB characteristic parameters. 展开更多
关键词 cemented paste backfill concentration hyperspectral imaging non-destructive testing
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Study on the destabilizing damage precursors of cemented tailings backfill based on critical slowing down theory combined with multiple denoising algorithms under consideration of initial defect conditions 认领 引用 被引量：1
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作者 ZHAO Kang ZHONG Jun-cheng +3 位作者 YAN Ya-jing LIU Yang WEN Dao-tan XIAO Wei-ling 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期375-399,共25页
The cemented tailings backfill(CTB)with initial defects is more prone to destabilization damage under the influence of various unfavorable factors during the mining process.In order to investigate its influence on the... The cemented tailings backfill(CTB)with initial defects is more prone to destabilization damage under the influence of various unfavorable factors during the mining process.In order to investigate its influence on the stability of underground mining engineering,this paper simulates the generation of different degrees of initial defects inside the CTB by adding different contents of air-entraining agent(AEA),investigates the acoustic emission RA/AF eigenvalues of CTB with different contents of AEA under uniaxial compression,and adopts various denoising algorithms(e.g.,moving average smoothing,median filtering,and outlier detection)to improve the accuracy of the data.The variance and autocorrelation coefficients of RA/AF parameters were analyzed in conjunction with the critical slowing down(CSD)theory.The results show that the acoustic emission RA/AF values can be used to characterize the progressive damage evolution of CTB.The denoising algorithm processed the AE signals to reduce the effects of extraneous noise and anomalous spikes.Changes in the variance curves provide clear precursor information,while abrupt changes in the autocorrelation coefficient can be used as an auxiliary localization warning signal.The phenomenon of dramatic increase in the variance and autocorrelation coefficient curves during the compression-tightening stage,which is influenced by the initial defects,can lead to false warnings.As the initial defects of the CTB increase,its instability precursor time and instability time are prolonged,the peak stress decreases,and the time difference between the CTB and the instability damage is smaller.The results provide a new method for real-time monitoring and early warning of CTB instability damage. 展开更多
关键词 initial defects cemented tailings backfill critical slowing down acoustic emission RA/AF values denoising algorithms
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CO2nanobubble-enhanced cement-fly ash backfill:Optimizing aggregate gradation and microstructure 认领 引用 被引量：1
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作者 Xiaoxiao Cao Haoyan Lyu +4 位作者 Yanlong Chen Jiangyu Wu Hideki Shimada Takashi Sasaoka Akihiro Hamanaka 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第1期129-140,共12页
Mine filling materials urgently need to improve mechanical properties and achieve low-carbon transformation.This study explores the mechanism of the synergistic effect of optimizing aggregate fractal grading and intro... Mine filling materials urgently need to improve mechanical properties and achieve low-carbon transformation.This study explores the mechanism of the synergistic effect of optimizing aggregate fractal grading and introducing CO2nanobubble technology to improve the performance of cement-fly ash-based backfill materials(CFB).The properties including fluidity,setting time,uniaxial compressive strength,elastic modulus,porosity,microstructure and CO2storage performance were systematically studied through methods such as fluidity evaluation,time test,uniaxial compression test,mercury intrusion porosimetry(MIP),scanning electron microscopy-energy dispersive spectroscopy analysis(SEM-EDS),and thermogravimetric-differential thermogravimetric analysis(TG-DTG).The experimental results show that the density and strength of the material are significantly improved under the synergistic effect of fractal dimension and CO2nanobubbles.When the fractal dimension reaches 2.65,the mass ratio of coarse and fine aggregates reaches the optimal balance,and the structural density is greatly improved at the same time.At this time,the uniaxial compressive strength and elastic modulus reach their peak values,with increases of up to 13.46%and 27.47%,respectively.CO2nanobubbles enhance the material properties by promoting hydration reaction and carbonization.At the microscopic level,CO2nanobubble water promotes the formation of C-S-H(hydrated calcium silicate),C-A-S-H(hydrated calcium aluminium silicate)gel and CaCO3,which is the main way to enhance the performance.Thermogravimetric studies have shown that when the fractal dimension is 2.65,the dehydration of hydration products and the decarbonization process of CaCO3are most obvious,and CO2nanobubble water promotes the carbonization reaction,making it surpass the natural state.The CO2sequestration quality of cement-fly ash-based materials treated with CO2nanobubble water at different fractal dimensions increased by 12.4wt%to 99.8wt%.The results not only provide scientific insights for the design and implementation of low-carbon filling materials,but also provide a solid theoretical basis for strengthening green mining practices and promoting sustainable resource utilization. 展开更多
关键词 cement-fly ash-based backfill CO2nanobubble fractal dimension macro and micro performance carbon sequestration
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CO2-driven structural transformation of steel slag into low-carbon cementitious materials for carbon-reducing mine backfill 认领 引用 被引量：1
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作者 Bo Su Xingtong Yue +5 位作者 Ning Shao Yong Sun Liancheng Wang Xiaobo Liu Jingping Qiu Yingliang Zhao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第7期2255-2270,共16页
Mine backfilling is a critical geotechnical operation for underground stability and waste management,while its environmental performance is increasingly constrained by the high carbon footprint of cementitious binders... Mine backfilling is a critical geotechnical operation for underground stability and waste management,while its environmental performance is increasingly constrained by the high carbon footprint of cementitious binders,particularly ordinary Portland cement(OPC).This study investigates the use of CO2-mineralized steel slag as a reactive supplementary binder for mine backfill to develop a carbon-reducing mine backfill(CRMB),while simultaneously enhancing mechanical performance and reducing carbon emissions.The results show that moderate carbonation(~50% carbonation degree)significantly improves backfill performance,with CRMB2 achieving a24.5%increase in 28 d compressive strength compared with the uncarbonated system and slightly outperforming OPC under identical conditions.Mechanistic analyses demonstrate that CO2 mineralization induces the formation of highly reactive CaCO3 and silica gels,which reprogram hydration pathways by accelerating silicate and aluminate reactions.Furthermore,the availability of carbonate species promotes the formation of stable carboaluminate phases,contributing to sustained strength development at later ages.Nanoindentation also confirms that both low-and high-density calcium silicate hydrate(C-S-H)phases exhibit enhanced stiffness at moderate carbonation levels.From an environmental perspective,CRMB reduces embodied CO2 emissions by up to~60% relative to OPC,resulting in superior strength-to-emission efficiency and demonstrating its effectiveness as a carbon-sequestering supplementary binder for mine backfill. 展开更多
关键词 green mines mine backfill carbon emission steel slag CO2mineralization
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Consolidation and mechanical response of cemented tailings backfill to multiaxial stresses from rockwall closure and self-loading 认领 引用 被引量：1
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作者 Hongbin Liu Mamadou Fall 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3407-3424,共18页
Cemented paste backfill(CPB)is a key material in underground mining,providing essential ground support while aiding in tailings management.However,current research has overlooked the combined effects of horizontal roc... Cemented paste backfill(CPB)is a key material in underground mining,providing essential ground support while aiding in tailings management.However,current research has overlooked the combined effects of horizontal rockwall closure stress and vertical self-loading stress,referred to as multiaxial stress,on the CPB's consolidation behavior and its mechanical properties development.Understanding and assessing these effects is critical because they directly affect the stability and performance of CPB structures.In this study,a novel multiaxial compressive stress curing and monitoring apparatus was used to simulate two horizontal rockwall closure scenarios with a consistent backfilling rate,under both drained and undrained conditions.Key parameters assessed included unconfined compressive strength(UCS),deformation during curing,stress-strain behavior,and modulus of elasticity.The results highlight that rockwall closure,combined with vertical stress,plays a pivotal role in the consolidation behavior of CPB,significantly affecting key mechanical properties.Higher horizontal stress from faster rockwall closure intensified compression during curing,leading to reduced porosity,enhanced particle rearrangement,and accelerated consolidation.This intensified consolidation leads to notable improvements in mechanical properties,including increased UCS,enhanced stiffness,and a higher modulus of elasticity,indicating improved load-bearing capacity.Moreover,the interaction between multiaxial stress and drainage conditions influenced stress-strain behavior and deformation,with drained conditions promoting earlier plasticity and higher peak stresses.These findings underscore the critical influence of multiaxial stress,combined with drainage conditions,on CPB performance,offering valuable insights for optimizing CPB design in underground mining applications. 展开更多
关键词 Consolidation behaviour Cemented paste backfill(CPB) Tailings Multiaxial stresses curing Mine Rockwall closure
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Load-bearing characteristics of backfilling solids in deep mining under flexible passive confining pressure: An experimental study 认领 引用
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作者 Minghe Ju Bo Zhang +7 位作者 Liyuan Yu Chaohan Hu Baiyi Li Wenzhe Gu Linming Dou Qiang Zhang Hao Ji Ruyi Cheng 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第4期811-828,共18页
To address the deviation between rigid confining pressure experiments and actual engineering conditions of deep backfill mining,where backfill near the working face has less confining pressure,while that in deep goaf ... To address the deviation between rigid confining pressure experiments and actual engineering conditions of deep backfill mining,where backfill near the working face has less confining pressure,while that in deep goaf areas is under high confining pressure,this study investigates the load-bearing characteristics of rock granular materials under flexible passive confining pressure.Customized PC molds with varying wall thicknesses and rigid steel molds were used to construct a gradient confining pressure environment.Compression tests were conducted,combined with the characterization of acoustic emission(AE) monitoring,strain measurement,particle sieving,and scanning electron microscopy(SEM) observation.The results show that flexible passive confining pressure divides the particle compression process into three stages that are different from those under traditional rigid constraints,namely the initial compaction stage,the crushing failure stage,and the lateral confinement-dominated stage.AE signals exhibit a bimodal energy distribution,and the time interval between the two can vary by more than 4 times with changes.The failure modes transition from shear to tension.Compared with intact materials,granular materials under lateral confinement maintain continuous volume contraction,and can even maintain a continuous volume contraction trend at least when the strain reaches 8%.And lateral confinement stiffness significantly enhances axial bearing capacity: when the axial strain reaches 30%,the axial stress in the rigid confinement group is nearly 5 times that in the flexible confinement group.Fractal dimension increases from 1.94 to 2.39 as the confinement stiffness rises.This study clarifies the influence mechanism of lateral confinement stiffness on granular mechanics,providing fundamental support for optimizing backfill design based on goaf locations and improving surrounding rock control in deep green mining. 展开更多
关键词 Backfill mining Rock particle breakage Flexible confinement Confining stiffness Stress–strain behavior
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Damage constitutive model and damage evolution characteristics of gangue cemented backfill with different moisture contents based on energy dissipation 认领 引用
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作者 YU Xiang YANG Ke +3 位作者 HE Xiang HOU Yong-qiang WEI Zhen HE Shu-xin 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第6期2651-2681,共31页
To reveal the influence of moisture content on the mechanical properties and damage of gangue cemented backfill,uniaxial compression tests were carried out on gangue cemented backfill with four different moisture cont... To reveal the influence of moisture content on the mechanical properties and damage of gangue cemented backfill,uniaxial compression tests were carried out on gangue cemented backfill with four different moisture contents(dry,natural,immersed,and saturated).The influence of moisture content on the characteristic parameters,energy evolution,distribution characteristics and peak point energy index of gangue cemented backfill was considered.The unit characteristic change rate and unit energy change rate were proposed to describe the degree of variation in the characteristic parameters and peak point energy indicators with moisture content.From the perspective of energy dissipation,a damage constitutive model considering the initial compaction closure and post-peak failure stages was established,and the model was revised to compensate for the shortcomings of the current damage constitutive model research.The stress−strain curve of the gangue-cemented backfill before reaching the saturated state exhibited a typical four-stage characteristic,whereas the gangue-cemented backfill in the saturated state lost the initial compaction closure stage.The characteristic parameters of the cemented gangue backfill decreased in the form of a quadratic function with the increase of moisture content.The unit characteristic change rate gradually decreased with the increase of moisture content,and the decreased amplitude gradually increased,indicating that the order of the influence of moisture state on the unit characteristic change rate of gangue cemented backfill was:drying effect<immersion effect<saturation effect.The energy evolution law of gangue cemented backfill with different moisture contents was consistent with the stage characteristics of the stress−strain curve.Before the saturated state,the elastic energy ratio curves of the gangue-cemented backfill all showed a trend of first increasing and then decreasing,whereas the dissipation energy ratio curves showed a trend of first decreasing and then increasing.The order of influence of the moisture state on the unit energy change rate of the total strain energy and elastic energy of the gangue-cemented backfill was as follows:drying effect<immersion effect<saturation effect,while the order of influence on the unit energy change rate of the dissipated energy was as follows:saturation effect<immersion effect<drying effect.With the increase in the moisture content of the gangue-cemented backfill,the failure mode of the backfill mainly underwent a transformation from tensile failure to tensile-shear mixed failure and then to"V"-shaped shear failure.The modified damage constitutive model based on energy dissipation considering the initial compaction closure stage and the post-peak failure stage has a high consistency with the test curve,and the energy dissipation curve and damage evolution curve of the cemented gangue backfill with different moisture content were also consistent.When the dissipation energy curve reached the threshold,the damage evolution curve also reached the threshold.These results provide a theoretical basis for studying the long-term stability of gangue-cemented backfill with different moisture contents in the goaf. 展开更多
关键词 gangue cemented backfill compressive strength energy evolution dissipation energy damage constitutive model
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Damage evolution law under unloading confining pressure of cemented backfill based on energy dissipation 认领 引用
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作者 LIU Wei-zhen GONG Bin +3 位作者 NIU Shi-wei WANG Hui-qin LI Hong-rui HU Zhong-jing 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期400-421,共22页
High ground temperature and unloading disturbance have emerged as critical factors impacting the property of cemented gauge-fly ash backfill(CGFB).The characteristics of energy and damage in CGFB were analyzed under c... High ground temperature and unloading disturbance have emerged as critical factors impacting the property of cemented gauge-fly ash backfill(CGFB).The characteristics of energy and damage in CGFB were analyzed under conditions of high ground temperature and unloading by conducting triaxial unloading tests with different initial confining pressures on CGFB that had been cured at various temperatures.Based on dissipative energy,triaxial unloading confining pressure damage constitutive model of CGFB was constructed.It has been demonstrated that the ratio of elastic strain energy in CGFB decreases and the ratio of dissipated energy increases at the end of unloading increases under higher curing temperature.The change in the elastic energy consumption ratio curve of CGFB,which shifts from a gradual increase to a swift rise at a certain"inflection point",can be utilized as a criterion for evaluating the failure of the unloading strength of CGFB.The triaxial unloading damage constitutive model for CGFB divides the damage progression into three distinct phases:initial damage stage,accelerated damage development stage,and rapid damage growth stage.The research findings offer a theoretical foundation for evaluating the extent of damage to CGFB caused by the combined influences of elevated ground temperature and unloading. 展开更多
关键词 curing temperature cemented gangue-fly ash backfill unloading confining pressure dissipated energy damage constitutive model
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Mechanical properties and energy evolution characteristics of magnesium slag-blast furnace slag-based backfill with different curing ages and magnesium slag contents 认领 引用
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作者 YANG Xiao-bing YANG Jian +6 位作者 WANG Xi YIN Sheng-hua ZHANG Xi-zhi LI Gong-cheng CHEN Xun QI Yao-bin CHEN Wei 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第5期2360-2385,共26页
Utilizing solid waste resources and lowering backfill costs are made possible by the preparation of cementitious materials as cement substitutes using magnesium slag(MS)and blast furnace slag(BFS).Uniaxial compression... Utilizing solid waste resources and lowering backfill costs are made possible by the preparation of cementitious materials as cement substitutes using magnesium slag(MS)and blast furnace slag(BFS).Uniaxial compression tests were carried out on MS-BFS-based backfill with different MS contents(20%,30%,40%,and 50%)and curing ages(3,7,and 28 d)to investigate their effects on the mechanical properties and energy evolution characteristics of the MS-BFS-based backfill.The coupled effects of curing age and MS content on the compressive strength and elastic modulus of the MS-BFS-based backfill are discussed.The energy damage evolution characteristics,energy distribution characteristics,and energy indexes at the peak stress point of the MS-BFS-based backfill were examined,and an energy damage constitutive model was constructed based on energy dissipation.The results show that with increasing curing age,the brittleness of the MS-BFS-based backfill specimen itself is gradually enhanced.With increasing MS content,the post-peak brittle deformation capacity of the MS-BFS-based backfill at all curing ages is enhanced,while post-peak plasticity diminishes.A moderate amount of MS(30%)improves the strength properties of the backfill and provides similar enhancement at all curing ages.On the 28th day,the strength and elastic modulus of the backfill with 30%MS content can reach 7.677 and 1317.063 MPa,respectively.The established two-factor coupling function can better represent the coupled effect of curing age and MS content on the mechanical parameters and energy indexes of the MS-BFS-based backfill.After introducing the pre-peak compaction coefficient,the damage constitutive model based on energy dissipation effectively characterizes the stress−strain behavior of the MS-BFS-based backfill.The findings can provide support for the application and stability analysis of MS-BFS-based backfill. 展开更多
关键词 solid waste resource utilization magnesium slag-blast furnace slag-based backfill magnesium slag content mechanical properties energy damage evolution coupled effects
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Developing low-carbon mine backfill:Performance optimization and carbon storage using CO2nanobubble and high-volume fly ash 认领 引用
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作者 Xiaoxiao Cao Haoyan Lyu +5 位作者 Feng Ju Meng Xiao Juan Xu Hideki Shimada Takashi Sasaoka Akihiro Hamanaka 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第7期1433-1451,共19页
Achieving carbon neutrality and large-scale industrial waste utilization requires low-carbon mine backfill materials.This study investigates a strategy to enhance cement-fly ash based composites using CO2nanobubble... Achieving carbon neutrality and large-scale industrial waste utilization requires low-carbon mine backfill materials.This study investigates a strategy to enhance cement-fly ash based composites using CO2nanobubble water.Normal cement-fly ash based backfill and CO2nanobubble-modified cement-fly ash based backfill were compared through mechanical and microstructural analyses,including uniaxial compression,mercury intrusion porosimetry,scanning electron microscopy and thermogravimetric analysis.The results demonstrate that CO2nanobubbles effectively mitigate the strength degradation induced by high fly ash replacement.Compared with normal backfill,the uniaxial compressive strength and elastic modulus of modified samples increased by 6.5%-13.4%and 14.8%-59.1%,respectively,enabling highvolume fly ash utilization without compromising mechanical integrity.Microstructural analyses reveal that CO2nanobubble water promotes hydration and in-situ carbonation reactions,leading to the formation of uniformly distributed C-S-H gels and calcium carbonate crystals that refine the pore structure and reduce total porosity by approximately 20%.Thermogravimetric results further confirm that CO2nanobubble significantly enhance carbonation efficiency,with the maximum carbonation degree reaching 13.07%at a fly ash content of 60%.Balancing performance and cost,the optimal fly ash content is identified within 20%-60%,providing a green pathway for mining waste valorization. 展开更多
关键词 Low-carbon backfill CO2nanobubble High-volume fly ash Carbon sequestration Cost-benefit analysis
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Enhancing the performance of waste-derived super-sulfated with carbonated recycled concrete fines for cemented paste backfill applications 认领 引用
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作者 Liancheng Wang Xingtong Yue +4 位作者 Ping Jiang Xiaobo Liu Shiyu Zhang Kai Cui Yingliang Zhao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第2期492-506,共15页
This study investigates the performance enhancement of super-sulfated cement(SSC)derived from arsenic-containing bio-oxidation waste(BW)through the incorporation of carbonated recycled concrete fines(CRCF).The finding... This study investigates the performance enhancement of super-sulfated cement(SSC)derived from arsenic-containing bio-oxidation waste(BW)through the incorporation of carbonated recycled concrete fines(CRCF).The findings revealed that the addition of 5wt%CRCF yields optimal performance,with compressive strengths reaching approximately 1.83,12.59,and 42.81 MPa at 1,3,and 28 d,respectively.These values represented significant increases of 408.3%,10.0%,and 14.3%compared to the reference sample.The improvement was attributed to the synergistic effects of ultrafine CRCF particles acting as fillers and nucleation sites,as well as the high reactivity of silica gels,which promoted the formation of additional hydration gels.Microstructural analysis confirmed that CRCF addition refined pore structure,and enhanced the stiffness of C-S-H gels.Furthermore,CRCF served as a net CO2 sink,sequestering 0.268 kg CO2 per kilogram of CRCF and thereby reducing the carbon footprint of SSC.In addition,the feasibility of applying CRCF-modified SSC in cemented paste backfill(CPB)is highlighted,given the high cement-related carbon footprint of conventional CPB.When 5wt%CRCFmodified SSC was employed in CPB,its 3-d compressive strength attained over 70%of that of ordinary Portland cement(OPC),while the 28-d strength was comparable to that of OPC.The proposed binder thus provides a sustainable pathway for BW valorization,combining waste utilization,carbon sequestration,and improved engineering performance. 展开更多
关键词 super-sulfated cement compressive strength bio-oxidation waste arsenic cemented paste backfill
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Time-dependent ground stability of inclined backfilled stope characterized by creep behavior 认领 引用
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作者 Ruofan Wang Yujie Zhu +3 位作者 Lang Liu Mengbo Zhu Baoxu Yan Hao Cui 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第2期479-491,共13页
Backfill is routinely adopted as a ground support measure for underground mines.However,ground stability enhancement by backfill has received limited research attention.This is likely to be because of the conventional... Backfill is routinely adopted as a ground support measure for underground mines.However,ground stability enhancement by backfill has received limited research attention.This is likely to be because of the conventional assumption that the fill material exhibits a significantly lower stiffness than the host rocks.Significantly,a recent pioneering work revealed the time-dependent ground stability around a backfilled stope with vertical walls through numerical modeling.In practice,underground stopes typically exhibit a higher or lower degree of inclination.This alters the stress state in peripheral rocks and may induce severe instability and dilution,particularly in stope-hanging walls.Hence,it is imperative to analyze the time-dependent ground stability of inclined backfilled stopes for backfill structure design.Therefore,comprehensive numerical simulations were performed using FLAC3D to address this knowledge deficiency by incorporating a coupled analysis of the backfill consolidation behavior and long-term creep deformation in surrounding rocks.The ground stability was evaluated based on the confinement effectiveness,strength-stress ratio,stress path relative to the yield surface,and time-dependent stress redistribution in the rocks.A parametric study revealed that the inclination angle of the backfilled stope reduced the confinement effectiveness in the host rocks when the wall creep was minor.This exacerbated the rock mass sloughing potential.However,a backfilled stope with a shallower dip angle achieved superior ground stability enhancement when the creep deformation was substantial,by applying a more significant compression on the backfill and effectively mobilizing its passive support performance during consolidation.Additional simulations were conducted to analyze the effects of stope height and width,mine depth,mechanical properties of rocks,backfill compressibility,and filling gap on the time-dependent stress redistribution and stability around the inclined backfilled stope. 展开更多
关键词 inclined backfilled stope ground stability time-dependency creep consolidation
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Mechanical response and pore pressure evolution of cemented paste backfill under deep mine-like multiaxial stress and temperature conditions 认领 引用
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作者 Hongbin Liu Mamadou Fall 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第2期457-474,共18页
As underground mining advances to greater depths,cemented paste backfill(CPB)is increasingly subjected to complex thermo-mechanical loading conditions,including multiaxial stress states and elevated temperatures.This ... As underground mining advances to greater depths,cemented paste backfill(CPB)is increasingly subjected to complex thermo-mechanical loading conditions,including multiaxial stress states and elevated temperatures.This study investigates the coupled effects of field-representative vertical self-weight and horizontal rockwall closure stresses,along with in-situ temperatures,on the mechanical behavior and pore water pressure(PWP)evolution of CPB.Experiments were conducted using a novel apparatus capable of controlling multiaxial stress and temperature during curing,replicating in-situ stress paths and thermal profiles typical of deep mine environments.Results show that multiaxial stress enhances CPB strength and stiffness by promoting denser particle packing,reducing porosity,and increasing frictional resistance.Elevated temperatures independently accelerate early-age cement hydration,further improving bond strength and stiffness.When combined,multiaxial stress and elevated temperature produce a synergistic enhancement in unconfined compressive strength(UCS)and elastic modulus,as confirmed by two-way ANOVA and synergy index analysis.PWP responses were also highly sensitive to thermo-mechanical conditions.The evolution of positive and negative PWP was governed by the interplay of thermal expansion,hydration-induced desaturation,and mechanical compaction.Multiaxial stress amplified early positive PWP and delayed its dissipation,whereas elevated temperature accelerated hydration and reduced pore pressure,leading to enhanced suction at later ages.A transient“stress-induced resaturation”effect was observed under late-stage excessive horizontal stress but was mitigated by elevated temperatures.These findings provide critical insights into the coupled mechanical and hydraulic behavior of CPB under realistic field conditions and offer guidance for optimizing backfill design,binder content,and barricade stability in deep mining applications. 展开更多
关键词 Cemented paste backfill Tailings Multiaxial stress Field temperature Mechanical properties Pore water pressure Rockwall closure
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Thermomechanical and microstructural characteristics of cemented backfill incorporating low-dosage polyvinyl chloride powder 认领 引用 被引量：1
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作者 Chao Zhang Jinping Guo +3 位作者 Tingting Li Weidong Song Yuan Wang Abbas Taheri 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第7期2206-2219,共14页
With the increasing mining depth,heat hazards have become a critical challenge in deep underground operations.This study explores the incorporation of polyvinyl chloride(PVC)powder as a partial cement replacement in c... With the increasing mining depth,heat hazards have become a critical challenge in deep underground operations.This study explores the incorporation of polyvinyl chloride(PVC)powder as a partial cement replacement in cemented backfill to improve thermal insulation and promote sustainable waste utilization.Five mix designs were prepared with 0,5wt%,10wt%,15wt%,and 20wt%PVC,and their thermomechanical behaviors were systematically evaluated through uniaxial compressive strength(UCS)testing,thermal parameter measurements,energy evolution analysis,and micro structural characterization via scanning electron microscopy.The results showed that the UCS and energy absorption capacity first increased and then decreased with PVC addition,reaching an optimum at10wt%PVC,which achieved an 87.5% higher strength and improved energy dissipation compared with the control.The thermal conductivity and specific heat capacity progressively decreased with increasing PVC content,with the maximum reductions of 23.0% and 40.2%,respectively,for 20wt%PVC.Microstructural analysis confirmed that moderate PVC addition reduced the porosity and enhanced the internal compactness,whereas excessive PVC likely inhibited calcium silicate hydrate gel formation and weakened the structural integrity.A PVC dosage of 10wt% was identified as the optimal replacement level,providing a favorable balance between strength and thermal insulation.This study provides new insights into sustainable backfill design and offers a practical strategy for mitigating thermal hazards in deep mining environments. 展开更多
关键词 cemented backfill polyvinyl chloride uniaxial compressive strength thermal properties microstructure
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Coupled effects of sodium lignosulfonate and water-to-binder mass ratio on rheology,strength and microstructure of high-volume fly ash cemented paste backfill 认领 引用 被引量：1
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作者 Haoyan Lyu Xiaoxiao Cao +2 位作者 Hideki Shimada Takashi Sasaoka Akihiro Hamanaka 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第7期2178-2193,共16页
High-volume fly ash(HVFA)binders are widely utilized as a mature method for cemented paste backfill in green mining,yet their performance remains highly sensitive to mix design.The fundamental coupling mechanism betwe... High-volume fly ash(HVFA)binders are widely utilized as a mature method for cemented paste backfill in green mining,yet their performance remains highly sensitive to mix design.The fundamental coupling mechanism between the water-to-binder mass ratio(W/B)and sodium lignosulfonate(SL)content in pozzolan-rich HVFA systems remains insufficiently understood.In this study,HVFA pastes with varying SL contents(0-0.9wt%)and W/B(0.5-0.8)were characterized via rheometry,unconfined compressive strength(UCS)tests,and microstructural analyses,including zeta potential measurements.Results indicated that the absolute zeta potential magnitude increased from 11.88 to 27.08 mV as SL dosage rose from 0 to 0.9wt%,providing direct evidence for enhanced electrostatic repulsion.This surface modification significantly reduced yield stress and decreased the Relative Thixotropic Index(RTI)from 14.99% to7.88% at a W/B of 0.5 with 0.3wt%SL.The effect of SL on 28-d UCS was non-monotonic,peaking at 35.72 MPa with 0.3wt%SL.The mercuty intrusion porosimetry(MIP)analysis revealed a primary pore diameter shift from the harmful range(~284 nm)to the refined range(183 nm),while X-ray diffraction(XRD)analysis confirmed enhanced calcium hydroxide consumption via pozzolanic reactions.The findings elucidate the dual role of SL as a physical dispersant optimizing particle packing and a chemical modulator governing hydration kinetics.These quantitative relationships provide a scientific basis for the performance-based design and intelligent pumping control of HVFA binders. 展开更多
关键词 cemented paste backfill high-volume fly ash binders sodium lignosulfonate rheological behavior water-to-binder ratio mi-crostructure zeta potential intelligent pumping control
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Blast furnace slag-based binder as an eco-friendly and cost-effective material in cementitious mine backfill:Mechanisms,applications and future perspectives 认领 引用 被引量：1
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作者 Zhuoran Wang Jixiong Zhang +3 位作者 Haiqiang Jiang Liang Cui You Fu Erol Yilmaz 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第7期2220-2241,共22页
In conventional cemented paste backfill(CPB),ordinary Portland cement(OPC)is the primary binder;however,it has drawbacks such as high costs and carbon emissions,and low durability.Granulated blast-furnace slag,a bypro... In conventional cemented paste backfill(CPB),ordinary Portland cement(OPC)is the primary binder;however,it has drawbacks such as high costs and carbon emissions,and low durability.Granulated blast-furnace slag,a byproduct of ironmaking,has emerged as a promising sustainable additive.In this review,three slag-based binders—slag-cement blends(SCB),alkali-activated slag(AAS),and alkali-sulfate-activated slag(ASAS)—are discussed,focusing on their hydration mechanisms,rheological characteristics,mechanical properties,microstructure,sulfate resistance,and heavy metal solidification capabilities.SCB-CPB exhibits enhanced fluidity and latestage strength compared to OPC-CPB,albeit with reduced early-stage strength.Although AAS exhibits superior comprehensive properties,its application is hindered by the high cost and corrosiveness of alkali activators.In contrast,ASAS emerges as a balanced solution,offering early-and late-age strength,second only to AAS,while being the most cost-effective and lowest-carbon option.Moreover,the furure prospects of slag-based binders in CPB are discussed,providing valuable guidance for their formulation and application.These findings offer valuable insights for the further development and implementation of cost-effective and environmentally friendly slag-based binders in CPB applications. 展开更多
关键词 cemented paste backfill slag-based binder hydration mechanisms mechanical performance microstructure
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