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ONE-DIMENSIONAL CONSOLIDATION OF LAYERED SOILS WITH IMPEDED BOUNDARIES UNDER TIME-DEPENDENT LOADINGS 认领 引用
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作者 蔡袁强 梁旭 吴世明 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第8期937-944,共8页
On the basis of Terzaghi's one-dimensional consolidation theory, the variation of effective stress ratio in layered saturated soils with impeded boundaries under time-dependent loading was studied. By the method o... On the basis of Terzaghi's one-dimensional consolidation theory, the variation of effective stress ratio in layered saturated soils with impeded boundaries under time-dependent loading was studied. By the method of Laplace transform, the solution was presented. Influences of different kinds of cyclic loadings and impeded boundaries conditions were discussed. Through numerical inversion of Laplace transform, useful illustrations were given considering several common time-dependent loadings. Pervious or impervious boundary condition is just the special case of the problem considered here. Compared with average index method,the results from the method illustrated are more accurate. 展开更多
关键词 one-dimensional consolidation impeded boundary layered soil time-dependent loadling Laplace transform effective stress ratio average index method
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Interfacial thermal contact model for consolidation of multilayered saturated soils subjected to time-dependent heating and loading 认领 引用 被引量：1
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作者 TANG Ke-jie WEN Min-jie +4 位作者 TU Yuan WU Wen-bing XIE Jia-hao LIU Kai-fu WU Da-zhi 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第6期2239-2255,共17页
Heat transfers at the interface of adjacent saturated soil primarily through the soil particles and the water in the voids.The presence of water induces the contraction of heat flow lines at the interface,leading to t... Heat transfers at the interface of adjacent saturated soil primarily through the soil particles and the water in the voids.The presence of water induces the contraction of heat flow lines at the interface,leading to the emergence of the thermal contact resistance effect.In this paper,four thermal contact models were developed to predict the thermal contact resistance at the interface of multilayered saturated soils.Based on the theory of thermal-hydro-mechanical coupling,semi-analytical solutions of thermal consolidation subjected to time-dependent heating and loading were obtained by employing Laplace transform and its inverse transformation.Thermal consolidation characteristics of multilayered saturated soils under four different thermal contact models were discussed,and the effects of thermal resistance coefficient,partition thermal contact coefficient,and temperature amplitude on the thermal consolidation process were investigated.The outcomes indicate that the general thermal contact model results in the most pronounced thermal gradient at the interface,which can be degenerated to the other three thermal contact models.The perfect thermal contact model overestimates the deformation of the saturated soil during the thermal consolidation.Moreover,the effect of temperature on consolidation properties decreases gradually with increasing interfacial contact thermal resistance. 展开更多
关键词 multilayered saturated soils thermal consolidation thermal contact resistance time-dependent loading Laplace transform
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Multi-pass intermittent local loading process of large-scale rib-web component:Forming characteristics and implementing apparatus 认领 引用 被引量：3
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作者 Dawei ZHANG Peng DONG +2 位作者 Jingxiang LI Zijian YU Shengdun ZHAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第1期601-625,共25页
The multi-pass intermittent local loading process,which features a more flexible processing path,can further enhance the second material distribution during local loading,improve the formability of components,and redu... The multi-pass intermittent local loading process,which features a more flexible processing path,can further enhance the second material distribution during local loading,improve the formability of components,and reduce forming loads.However,the absence of compatible forming equipment makes it difficult to control the constraint in the unloaded zones during the forming process.This difficulty complicates coordination and control of deformation,particularly for asymmetric rib-web components.Additionally,the current implementation involves multi-fire heating,a long process flow,and high energy consumption,which limits the popularization and application of the local loading process.In this study,a new multi-pass local loading hydraulic forming apparatus that can quickly and reliably switch between heavy-load deformation and low-load constraint for different local loading sub-dies was developed.A 10-tonne laboratory prototype was developed,and the forming characteristics during the forming process as well as the response characteristics of the hydraulic system during the multi-pass intermittent local loading of rib-web component were investigated using numerical simulations and physical experiments.Results indicated that,compared to a whole loading process with the same initial geometry of billet,the total forming load(i.e.,the sum of loaded and restrained loads)is reduced by more than 40%with the local loading process,and by nearly 50%with multi-pass local loading.The multi-pass local loading process allows for more effective control of material flow compared to single-pass local loading,leading to improved cavity filling and reduced flow line disturbance.For a large-scale,complex titanium alloy bulkhead,the cavity filling problem was addressed by optimizing the multi-pass local loading path with an unequal thickness billet.The dynamic performance of the multi-pass local loading hydraulic system was found to be robust,with stable pressure transitions during motion and load switching for the sub-die(s).The dynamic characteristic of the hydraulic cylinder when switching from non-moving/unloaded state to a moving/loading state are consistent whether a load is present or not.However,the dynamic characteristics differ when switching from a moving/loading state to non-moving/unloaded state,showing opposite behavior.The developed hydraulic drive mechanism provides a way for implementation of multi-pass local loading without auxiliary operation and extra heating.The results of the study provide a foundation for the industrial production of large-scale,complex components with reduced force requirement and low-energy consumption. 展开更多
关键词 Forming characteristics Hydraulic system Intermittent local loading process Material flow Rib-web component
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Time-dependent behavior of deep roadway surrounding rock considering damage induced by excavation and mining disturbances:Experiments,modeling,and simulation 认领 引用 被引量：1
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作者 Qingzhe Cui Rongbin Hou +4 位作者 Zhenhua Li Feng Du Xu Chen Boyang Zhang Lielie Li 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第2期439-456,共18页
In deep coal mining,surrounding rock is subjected to both high in-situ stress and intense mining disturbances,leading to significant time-dependent behavior.Accurately capturing this behavior is essential for predicti... In deep coal mining,surrounding rock is subjected to both high in-situ stress and intense mining disturbances,leading to significant time-dependent behavior.Accurately capturing this behavior is essential for predicting long-term roadway stability,necessitating the development of a reliable constitutive creep model and numerical simulation approach.In this study,creep experiments were conducted on pre-damaged rock with varying initial damage levels to investigate the time-dependent mechanical properties.Based on the experimental results,an accelerated-creep criterion was proposed,and an elastic-viscoplastic creep damage model(EVPCD)was established that simultaneously considers the effects of time-dependent damage and instantaneous damage caused by stress disturbances on rock creep behavior.Subsequently,the effectiveness of the proposed creep model was verified using experimental data,and the secondary development of the EVPCD model was completed based on the FLAC3D platform.Following this,a long-term stability analysis method of deep surrounding rock that accounts for excavation-and mining-induced disturbances was proposed.Using the main roadway of Xutuan Coal Mine as a case study,numerical simulations were carried out to investigate the time-dependent deformation and failure characteristics of the surrounding rock following excavation and mining disturbance.Combined with on-site monitoring of the surrounding rock damage areas,the results indicate that the EVPCD outperforms the CVISC and Nishihara models in predicting the time-dependent behavior of deep surrounding rock. 展开更多
关键词 Initial damage Time-dependent damage Creep model Numerical implementation Damage evolution
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Strain localization and time-dependent deformation in granodiorite characterized by distributed optical fiber sensing 认领 引用 被引量：1
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作者 Shuting Miao Arno Zang +3 位作者 Guido Blöcher Yinlin Ji Hannes Hofmann Pengzhi Pan 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期166-178,共13页
A multi-stage stress relaxation test was performed on a granodiorite sample to understand the deformation process prior to the macroscopic failure of brittle rocks,as well as the transient response during stress relax... A multi-stage stress relaxation test was performed on a granodiorite sample to understand the deformation process prior to the macroscopic failure of brittle rocks,as well as the transient response during stress relaxation.Distributed optical fiber sensing was used to measure strains across the sample surface by helically wrapping the single-mode fiber around the cylindrical sample.Close agreement was observed between the circumferential strains obtained from the optical fibers and the extensometer.The reconstructed full-field strain contours show strain heterogeneity from the crack closure phase,and the strains in the later deformation phase are dominantly localized within the former high-strain zone.The Gini coefficient was used to quantify the degree of strain localization and shows an initial increase during the crack closure phase,a decrease during the linear elastic phase,and a subsequent increase during the post-yielding phase.This behavior corresponds to a process of initial localization from an imperfect boundary condition,homogenization,and eventual relocalization prior to the macroscopic failure of the sample.The transient strain rate decay during the stress relaxation phase was quantified using the p-value in the"Omori-like"power law function.A higher initial stress at the onset of relaxation results in a lower p-value,indicating a slower strain rate decay.As the sample approaches macroscopic failure,the lowest p-value shifts from the most damaged zone to adjacent areas,suggesting stress redistribution or crack propagation in deformed crystalline rocks under stress relaxation conditions. 展开更多
关键词 Distributed optical fiber sensing Stress relaxation Strain localization Time-dependent deformation
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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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Effects of Temperature,Loading Frequency,Stress Amplitude,and Stress Ratio on the Low-Cycle Fatigue Behavior of FeMnSiCrNi Shape Memory Alloys 认领 引用 被引量：1
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作者 Bo Xu Beihai Huang +4 位作者 Sen Tang Xiang Xu Huabei Peng Chong Wang Qingyuan Wang 《Acta Mechanica Solida Sinica》 SCIE EI CSCD 2026年第2期133-151,共19页
FeMnSi-based shape memory alloys(SMAs)have great applied potential to large-scale structures in civil engineering,especially as an aseismic structural material.Low-cycle fatigue performance is one of the most importan... FeMnSi-based shape memory alloys(SMAs)have great applied potential to large-scale structures in civil engineering,especially as an aseismic structural material.Low-cycle fatigue performance is one of the most important properties of FeMnSi-based SMA aseismic materials.However,the low-cycle fatigue behavior of such SMAs,especially the stress-controlled low-cycle fatigue behavior(with ratchetting effect),has not been clearly understood.In this work,the low-cycle fatigue behavior of the FeMnSiCrNi SMAs subjected to stress-controlled cyclic tension–compression loads is investigated,and the effects of temperature,loading frequency,stress amplitude,and stress ratio are addressed.By analyzing the cyclic stress–strain response,fatigue fracture surface morphology,dissipation energy,ratchetting strain,and equivalent damping ratio,the mechanisms behind the temperature-,loading frequency-,stress amplitude-,and stress ratio-dependent low-cycle fatigue behavior are discussed.The results show that the plasticity,martensitic transformation,and/or the ratchetting strain caused by their tension–compression asymmetry are the decisive factors affecting the low-cycle fatigue behavior of FeMnSiCrNi SMAs. 展开更多
关键词 FeMnSiCrNi shape memory alloy Low-cycle fatigue behavior Temperature Loading frequency Stress amplitude Stress ratio
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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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Three-dimensional time-dependent fracturing model for hard rock involving stress-induced anisotropic cracks 认领 引用
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作者 Chen Fan Xia-Ting Feng +2 位作者 Jun Zhao Chengxiang Yang Mengfei Jiang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3333-3347,共15页
The time-dependent failure of surrounding rock in deep engineering is essentially controlled by the evolution of microcracks,with the pre-existing fracturing state induced by excavation playing a crucial role in the s... The time-dependent failure of surrounding rock in deep engineering is essentially controlled by the evolution of microcracks,with the pre-existing fracturing state induced by excavation playing a crucial role in the subsequent time-dependent fracturing process.From the perspective of microcrack development,it is a continuous,dynamic process.Therefore,taking the microcrack propagation process as the fundamental principle,this paper proposes a novel three-dimensional(3D)time-dependent model for hard rock that can depict the entire fracturing process within a unified theoretical framework.This developed model discards the traditional tri-modal partition method based on deformation,and instead adopts an analysis approach centred on time-dependent tensile and shear fracturing.The results show that the time-dependent deformation of hard rock is the macroscopic manifestation of the progressive evolution of microcracks over time.Under true triaxial stress,the growth tendency of cracks in hard rock is orientation-dependent throughout the entire loading process.This developed model provides a mechanical explanation for key time-dependent fracture characteristics observed in true triaxial creep tests,including the anisotropy of time-dependent deformation and the preferred orientation of macroscopic failure plane,and provides a novel framework for elucidating the time-dependent failure process of hard rock. 展开更多
关键词 Three-dimensional(3D)time-dependent model Continuous fracturing process Microcrack development Time-dependent anisotropic fracturing True triaxial stress
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Tunnel support in red bed soft rocks considering hydro-sensitivity and time-dependent behaviors:A review 认领 引用
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作者 Weizhong Chen Xiaoyun Shu +3 位作者 Hongming Tian Chenming Yang Xianjun Tan Zhende Zhu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第7期5862-5885,共24页
Red bed tunnel engineering presents significantchallenges due to the combined effects of hydrosensitivity and time-dependent nonlinear mechanical behavior of the surrounding rock masses.Despite critical stability conc... Red bed tunnel engineering presents significantchallenges due to the combined effects of hydrosensitivity and time-dependent nonlinear mechanical behavior of the surrounding rock masses.Despite critical stability concerns,globally recognized standardized design methodologies for support systems in such geological conditions are still under development.This comprehensive review systematically examines recent advancements in support technologies for red bed tunnels.The following conclusions can be drawn.First,based on the hydro-sensitive and time-dependent nature of red bed rocks,four dominant failure modes are identified:hydro-mechanical weakening failure,low-strength material failure,bedding plane-controlled structural failure,and time-dependent deformation failure.The applicability and performance of three representative stabilization strategies-prestressed anchorage,rock mass grouting,and yielding support systems-are then critically evaluated across different tunnel service stages.Second,prestressed anchorage and grouting are shown to effectively mitigate construction-phase instabilities caused by low rock strength and pronounced bedding structures,particularly using specialized anchorage systems and hydro-sensitive grouting materials that significantlyenhance the mechanical properties of red bed rock masses.Third,for long-term tunnel operation,the incorporation of compressible layers between the surrounding rock and secondary lining is highlighted as an effective solution to accommodate time-dependent deformation and prevent lining damage,with recommended ranges of mechanical parameters summarized from existing studies.Finally,key research frontiers are discussed,including the time-dependent anisotropic behavior of stratifiedred bed rock masses,scale effects in prestressed anchorage systems,and viscoelastic-plastic interactions in yielding support designs.The potential application of resilience-based design concepts is also emphasized,offering new perspectives for improving the long-term safety and adaptability of tunnels constructed in red bed soft rock formations. 展开更多
关键词 Red bed Tunnel support Time-dependent characteristics Water–rock interaction Tunnel construction
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The stress transfer mechanism of nacre-like composites under off-axis tensile loading 认领 引用
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作者 Peng Jiang Guangming Xia +5 位作者 Shi Bai Dongfang Xu Jixiang Qi Xun Xiong Xianben Ren Ying Li 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期466-472,共7页
Nacre exhibits excellent mechanical properties attributed to the staggered alignment of inorganic minerals and bio-organic materials.This study aims to understand how stress transfers from macro-scale loading conditio... Nacre exhibits excellent mechanical properties attributed to the staggered alignment of inorganic minerals and bio-organic materials.This study aims to understand how stress transfers from macro-scale loading conditions to the staggered architecture,revealing multiple stress transfer modes in nacre-like composites under off-axis tensile loading conditions.We propose an innovative off-axis tension-shear chain model,which predicts the trend of the equivalent modulus.Systematic optimization reveals a counter-intuitive result:the equivalent modulus at a certain angle can be smaller than the equivalent moduli in both principal directions,and this phenomenon differs from the monotonic behavior commonly observed in continuous fiber composite materials. 展开更多
关键词 Composites Load transfer Nacre Bioinspired Architected materials
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Thallium(Ⅰ)retention in porous media is restricted by elevated Mn(Ⅱ)and Fe(Ⅲ)loadings:Insights into suitability between media and microbial communities 认领 引用
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作者 Yuheng Huang Xiaoling Zhang +3 位作者 Ziqiang Liu Xiaoliu Huangfu Qiang He Suyan Pang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第6期665-675,共11页
In tailings permeated by leachate containing thallium(Tl),manganese oxides(MnO x)are recognized as critical substances in immobilizing Tl and preventing its further migration into groundwater.However,dissolved Mn(... In tailings permeated by leachate containing thallium(Tl),manganese oxides(MnO x)are recognized as critical substances in immobilizing Tl and preventing its further migration into groundwater.However,dissolved Mn(Ⅱ)and Fe(Ⅲ)also exist in micro-oxic environments.The effects and mechanisms of the increased levels of these coexisting ions,driven by environmental processes such as rainfall leaching,on Tl(Ⅰ)retention remain largely unclear.This study established two systems using natural manganese sand and limestone sand as porous media,demonstrating that the elevated Mn(Ⅱ)/Fe(Ⅲ)loadings weakened Tl(Ⅰ)retention.Redundancy analysis identified media type and depth as primary factors shaping microbial communities,which subsequently influenced Tl(Ⅰ)immobilization.Manganese sand exhibited superior recovery capacity compared to limestone sand under higher Mn(Ⅱ)and Fe(Ⅲ)loadings.Co-occurrence network analyses revealed that media-microorganism suitability governs microbial community structure and heavy metal retention efficiency.Hydraulic impact and dissolved organic/inorganic cations reduced MnO x content,while the higher retention capacity of manganese sand was attributed to the presence of microorganisms with higher activity and abundance,as well as an increased abundance of microbial-generated MnO_( x).This study offers novel insights into the mechanisms underlying Tl(Ⅰ)retention in tailings,which is crucial for comprehending its environmental fate. 展开更多
关键词 Thallium Restricted retention Porous media Elevated loadings Co-occurrence network
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A dual capillary contraction-induced prestressing strategy for high-loading Si/C anode with long cycling stability 认领 引用
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作者 Yanpeng Wang Fenghua Liu +6 位作者 Yusheng Luo Zhaoyang Song Zezhong Li Xiaomei Chen Shuang Liu Ke Gong Wei Liu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第6期287-295,I0008,共9页
Silicon(Si)is a leading anode candidate for high-energy-density lithium-ion batteries due to its exceptional theoretical specific capacity.However,its practical application is hindered by particle fracture under high ... Silicon(Si)is a leading anode candidate for high-energy-density lithium-ion batteries due to its exceptional theoretical specific capacity.However,its practical application is hindered by particle fracture under high areal loadings and the inherent trade-off between electrode density and ion transport kinetics.Herein,we propose a“dual capillary contraction”strategy to construct a dense,structurally robust silicon-based anode(Si@SA@GO).This method uses nano-CaCO3 as a sacrificial filler between graphene oxide(GO)layers,creating a“filled capillary”effect that amplifies contraction forces during initial drying.Subsequent removal of the filler generates nanopores,which then trigger an intense“hyper-contraction”driven by Young-Laplace pressure in a secondary drying stage.This cascaded process forges a pretensioned GO network that tightly confines Si nanoparticles,actively imposing compressive stress to counteract their volumetric expansion.The resulting electrode successfully resolves the conflict between density and structural stability,achieving a remarkable tap density of 0.84 g cm-3,while maintaining efficient ion transport pathways.The Si@SA@GO anode delivers an ultrahigh areal capacity of 8.5 mAh cm-2,with 75%capacity retention after 1000 cycles in the Si@SA@GO//LFP full cell.This work provides a scalable and effective route to resolve the long-standing trade-offs among density,stress,and kinetics in high-performance silicon anodes. 展开更多
关键词 Contraction Silicon anode High density High loading Lithium ion storage
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Ag-loading boosts full-spectrum photocatalysis performance of Bi2 WO6:Yb3+,Er3+ 认领 引用
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作者 Xuemei Lu Xin Guo +7 位作者 Xiaoxuan Fan Wen Liu Xu Gao Hainan Li Jialin Wang Yang Zhao Jiwei Wang Kexin Wang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第5期1453-1463,共11页
Currently,one of the main factors limiting the performance of photocatalytic technology is the suboptimal utilization efficiency of the infrared region in sunlight spectrum.Although rare earth ion doping can improve l... Currently,one of the main factors limiting the performance of photocatalytic technology is the suboptimal utilization efficiency of the infrared region in sunlight spectrum.Although rare earth ion doping can improve light absorption of photocatalysts in the infrared region to some extent,it is still restricted by a narrow absorption cross-section and relatively low photocatalytic efficiency under infrared light.In this work,a full-spectrum photocatalyst based on Bi2 WO6:Yb3+,Er3+/Ag composite was prepared.Ag loading formed a Schottky junction on the surface of Bi2 WO6 and introduced the localized surface plasmon resonance(LSPR)effect.Their synergistic interaction optimized the band structure and the separation efficiency of photogenerated charge carriers.Hot electron injection induced by the LSPR effect can simultaneously enhance the mutually independent photocatalytic processes driven by visible light and near-infrared light,thereby achieving an overall boost in full-spectrum photocatalytic performance.It enables Bi2 WO6:Yb3+,Er3+/Ag composite to efficiently address various refractory pollutants and complex conditions.Bi2 WO6:Yb3+,Er3+/Ag composite exhibits outstanding photodegradation performance for a diverse mixture of antibiotics,including tetracycline hydrochloride,norfloxacin,ciprofloxacin,and levofloxacin in real water samples under simulated sunlight irradiation.This work paves a way for the development of green,efficient,and sustainable environmental remediation technologies. 展开更多
关键词 Photocatalysis Precious metal loading Degradation Rare earth doping Upconversion
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Mechanical response and brittle-ductile transition of porous sandstone under true-triaxial loading 认领 引用
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作者 Junjie Xiao Xing Li +2 位作者 Jiacun Liu Dongping Liu Kaiwen Xia 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3394-3406,共13页
This study investigates the influence of mean stress and Lode angle on the mechanical behavior of porous sandstone.Sandstone specimens were tested using a newly developed true-triaxial loading apparatus under five con... This study investigates the influence of mean stress and Lode angle on the mechanical behavior of porous sandstone.Sandstone specimens were tested using a newly developed true-triaxial loading apparatus under five constant Lode angle conditions and seven different mean stresses,covering a transition from brittle to ductile regimes.Based on the experimental results,three types of stress-strain responses were identified,transitioning progressively from Type 1,through Type 2 to Type 3 as the mean stress increases.Type 1 response represents typical brittle behavior,characterized by prominent shear fractures.Type 2 response corresponds to the brittle-ductile transition behavior,exhibiting non-penetrating shear fractures.Type 3 response is associated with ductile behavior,characterized by no visible shear fractures.The deviatoric stress initially increases and then decreases with increasing mean stress,forming a cap surface in the meridian plane.A generalized failure criterion is subsequently developed,capable of accurately characterizing this strength response.Furthermore,the brittle-ductile transition behavior is found to be significantly dependent on the Lode angle.Finally,the brittle-ductile transition boundary is described,incorporating the dependence of Lode angle. 展开更多
关键词 True-triaxial loading Lode angle Brittle-ductile transition Porous sandstone Failure surface
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Mechanical behavior of granite under cyclic loading after a seawater cyclic thermal shock 认领 引用
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作者 Wenfeng Shen Wei Wang +3 位作者 Xuelei Duan Shifan Liu Hao Wang Qizhi Zhu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期2776-2793,共18页
The ocean,islands,and coastal areas represent significantpotential for geothermal energy development,owing to the abundant seawater resources serving as an efficientheat exchange medium.To study the mechanical behavio... The ocean,islands,and coastal areas represent significantpotential for geothermal energy development,owing to the abundant seawater resources serving as an efficientheat exchange medium.To study the mechanical behavior of granite under cyclic loading after cyclic thermal shock,a laboratory triaxial cyclic loading and unloading test was carried out.This paper presents the results of a study on the deformation behavior,mechanical properties,and failure modes of granite after 0–30 cycles of seawater thermal shock at 400℃.The experimental results show that the axial and circumferential plastic deformations increase monotonically with the number of cycles(N),while the elastic modulus changes nonlinearly.The computed tomography(CT)results indicate that seawater thermal shock cycles cause the formation of cracks on the granite surface.With an increase in the number of thermal shock cycles,the cracks gradually increase and expand inwards,resulting in a rise of 93.84%in axial strain and a decrease of 29.02%in failure strength(σc).Furthermore,the occurrence of shear failure is predominantly observed in the damaged granite,and shear-induced cracks form along the shear fractures when the number of thermal shock cycles exceeds 6.However,after three cycles of thermal shock,the failure surface of the granite exhibits characteristics of shear splitting failure,and theσcincreases by 14.96%. 展开更多
关键词 Geothermal exploitation Cyclic thermal shock Cyclic loading Mechanical characteristics Plastic deformation
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In-situ stress solution theory for borehole overcoring technique incorporating time-dependent effect of stress relief and its applications 认领 引用
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作者 Daohong Xia Shengjun Miao +5 位作者 Lianjun Chen Yuan Li Zejing Liu Rongmin Zhang Pengjin Yang Pengcheng Li 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第1期187-203,共17页
In-situ stress is a key parameter for underground mine design and rock stability analysis.The borehole overcoring technique is widely used for in-situ stress measurement,but the rheological recovery deformation of roc... In-situ stress is a key parameter for underground mine design and rock stability analysis.The borehole overcoring technique is widely used for in-situ stress measurement,but the rheological recovery deformation of rocks after stress relief introduces errors.To improve accuracy,this study proposes an in-situ stress solution theory that incorporates time-dependent stress relief effects.Triaxial stepwise loadingunloading rheological tests on granite and siltstone established quantitative relationships between instantaneous elastic recovery and viscoelastic recovery under different stress levels,confirming their impact on measurement accuracy.By integrating a dual-class elastic deformation recovery model,an improved in-situ stress solution theory was derived.Additionally,accounting for the nonlinear characteristics of rock masses,a determination method for time-dependent nonlinear mechanical parameters was proposed.Based on the CSIRO hollow inclusion strain cell,time-dependent strain correction equations and long-term confining pressure calibration equations were formulated.Finally,the proposed theory was successfully applied at one iron mine(736 m depth)in Xinjiang,China,and one coal mine(510 m depth)in Ningxia,China.Compared to classical theory,the calculated mean stress values showed accuracy improvements of 6.0%and 9.4%,respectively,validating the applicability and reliability of the proposed theory. 展开更多
关键词 In-situ stress solution theory Borehole overcoring technique Time-dependent effect of stress relief Viscoelastic recovery strain of rock In-situ stress measurement
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Dilatancy and long-term stability of deep salt caverns under cyclic loading 认领 引用
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作者 JI Zhen-xing QIN Ken +4 位作者 LIU Jian-feng WANG Gui-jiu YANG Jian-xiong YI Hai-yang WEI Jin-bing 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第5期2189-2209,共21页
Constructing salt caverns in deep formations poses significant challenges due to their high geostresses,pronounced creep behavior,and particularly intense pressure fluctuations.This study first conducted mechanical ex... Constructing salt caverns in deep formations poses significant challenges due to their high geostresses,pronounced creep behavior,and particularly intense pressure fluctuations.This study first conducted mechanical experiments to investigate the long-term creep behavior of salt rock and to examine the differences in its mechanical response under cyclic loading compared with traditional triaxial loading.The results revealed a confining-pressure-dependent nonlinear creep behavior as well as a degradation mechanism induced by cyclic loading.A numerical model was then developed that incorporates the nonlinear creep law with periodic parameter weakening.Comparative analyses of cavern dilatancy under cyclic versus constant pressure conditions were conducted,validating the necessity of integrating the periodic weakening mechanism into the numerical model.The results indicate that cyclic loading enhances the plastic deformation capacity while lowering its dilatancy threshold.For the cyclic gas pressure(CGP)mode,a minimum operational pressure of 9.6 MPa is infeasible due to excessive sidewall convergence and extensive spalling risk zones,with 12.0 MPa recommended as the lower limit.The constant brine pressure(CBP)mode exhibits superior performance in controlling deformation and damage.For the constant gas pressure(GP)mode,a constant pressure of 19.2 MPa results in no significant dilatancy damage zones in the salt layer.Critically,neglecting the dynamic weakening of parameters induced by cyclic loading leads to substantial underestimation of long-term deformation,by 20.2%in this study,primarily accumulated during the unloading(gas production)phase.The findings are expected to provide valuable insights into deep salt caverns with high-pressure fluctuations. 展开更多
关键词 deep salt cavern cyclic loading dilatancy cyclic gas pressure constant brine pressure
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The recrystallization mechanism and its effects on texture in pre-twinned AZ31 magnesium alloy during medium-high temperature impact loading 认领 引用
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作者 Xiao Liu Xiaofeng Zhang +6 位作者 Biwu Zhu Chao Xie Bibo Hu Wenhui Liu Luoxing Li Congchang Xu Pengcheng Guo 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第1期459-475,共17页
Investigating effect of recrystallization mechanism on deformation mode and texture evolution is conducive to controlling deformation mechanism and texture in magnesium alloys under medium-high temperature impact load... Investigating effect of recrystallization mechanism on deformation mode and texture evolution is conducive to controlling deformation mechanism and texture in magnesium alloys under medium-high temperature impact loading.In the present study,a Johnson-Cook model incorporating twin strengthening was established to simulate macro-deformation,and a twinning induced recrystallization(TDRX)model and bulging recrystallization(GBBDRX)model are introduced into visco-plastic self consistant(VPSC)framework to quantitatively study the deformation mechanism of pre-twinned AZ31 magnesium alloy during medium-high temperature impact loading.Both TDRX and GBBDRX occur,with basal slip as the dominant slip system,followed by pyramidal〈c+a〉slip and prismatic slip.The dynamic recrystallization(DRX)significantly influences basal and pyramidal〈c+a〉slip systems,with minimal impact on secondary deformation mechanism.In addition,the recrystallization mechanism of grain boundary bowing increases the activity of basal slip and decreases the activity of pyramidal〈c+a〉slip.The nucleation and growth of recrystallized grains enhance basal slip activity and suppress pyramidal〈c+a〉slip,leading to the formation of a strong basal texture.As dynamic recrystallization progresses,a bimodal texture develops,characterized by a reduction in basal component pole density and a more pronounced basal slip. 展开更多
关键词 Az31 magnesium alloy Texture Deformation mode Dynamic recrystallization Impact loading
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Damage behavior of soaked sandstone subjected to cyclic loadings 认领 引用
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作者 Zhenhui Bi Lei Wang +3 位作者 Chunhe Yang Yintong Guo Wuhao Guo Mingnan Xu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期1090-1107,共18页
Large-scale geological energy storage plays a crucial role in balancing the intermittency of renewable energy.As an energy storage medium,soaked sandstone has a wide range of applications in geological energy storage.... Large-scale geological energy storage plays a crucial role in balancing the intermittency of renewable energy.As an energy storage medium,soaked sandstone has a wide range of applications in geological energy storage.Understanding the damage characteristics in soaked sandstones is essential for ensuring the stability and longevity of these energy storage systems.This study involved multi-stage cyclic loading tests conducted on soaked sandstone to explore the damage evolution throughout the loading process.The findingsreveal several important insights:(1)The plastic hysteresis loops observed during multi-stage cyclic loading evolved from dense to sparse.An increase in stress level led to greater damage in the rock,as evidenced by an increase in accumulated peak/plastic strains.(2)Energy density and stress level are related by quadratic polynomial relationships.The elastic and dissipated energy densities are related by a linear law.The average energy storage coefficientdecreased by up to 24.1%with increasing stress amplitude,reflectingchanges in energy dynamics within the samples.(3)AE counts,amplitude,and frequency provided critical insights into rock damage and fracture patterns.The greater the loading rate and stress amplitude,the lower the proportion of high-amplitude,high-peak frequency,and shear-type fractures.Increasing stress amplitude caused a maximum 16.63%reduction in the AE bvalue,indicating shifts in fracture behavior under varying stress conditions.(4)The increase in loading rate and stress amplitude promotes the transformation of micropores and mesopores to macropores/microcracks.(5)Damage variables,definedin terms of cumulative dissipation energy,aligned closely with the fatigue damage model under multi-stage cyclic loading.Accelerated damage primarily occurred during the finalstages of fatigue loading,highlighting critical periods in the degradation of soaked sandstones.This study can offer guidance for designing operational parameters for energy storage geological bodies dominated by soaked sandstones. 展开更多
关键词 Soaked sandstone Multi-stage cyclic loading Energy density Acoustic emission Microstructure Damage evaluation
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