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Grouting and re-bearing behaviors of sandy mudstone in the residual stage 认领 引用
1
作者 Zipeng Xin Zhaoyun Chai +5 位作者 Xuliang Zhang Keqin Lian Chang Xiao Xiangyu Liu Yuxu Shen Wei Gong 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1909-1922,共14页
Grouting is an essential technique for reinforcing tunnel rock masses following deformation and failure.However,the mechanisms and effectiveness evaluation of grouting in fractured rock masses that have experienced su... Grouting is an essential technique for reinforcing tunnel rock masses following deformation and failure.However,the mechanisms and effectiveness evaluation of grouting in fractured rock masses that have experienced substantial deformation and transition into the residual stage remain insufficiently understood.To elucidate the relationship between grouting effectiveness and pre-cracking strain,grouting and subsequent re-fracturing tests were conducted on sandy mudstone specimens with varying levels of pre-cracking strain.Additionally,a model was developed to determine the optimal grouting timing during the residual stage.The results indicate that the failure mode of specimens in the residual stage exhibits banded and localized distribution patterns.As pre-cracking strain increases,both the maximum fracture aperture and the relative grout injection ratio increase,with the increases becoming more pronounced at higher strain levels.After grouting,the consolidation coefficient and strength enhancement coefficient exhibit a positive correlation with pre-cracking strain,although the rate of increase gradually decreases.Grouting does not alter the initial failure mode of residual-stage fractured specimens but effectively suppresses secondary crack propagation in regions distant from primary fractures.At the microscale,grout bonds within the rock matrix form cavity structures that delay tensile failure and generate an interconnected network,thereby enhancing crack resistance.Based on the evolution of rock damage and the efficiency of grouting materials utilization,a method is proposed to determine the optimal grouting timing for fractured specimens in the residual stage.At the optimal timing,specimens exhibit moderate damage while maintaining high reinforcement efficiency per unit mass of grout. 展开更多
关键词 Residual stage Grouting Pre-cracking strain Microstructures of the fracture surfaces Grouting timing
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Reconstruction of pore structure and transformation of failure mode in reef limestone under MICP grouting 认领 引用
2
作者 Wenxi Zhu Huafeng Deng +5 位作者 Linjian Ma Mingyang Wang Yao Xiao Hongya Li Lei Cheng Wenlong Yu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第4期793-810,共18页
Given the high porosity,strong connectivity,and low strength of reef limestone,microbial-induced carbonate precipitation(MICP) reinforcement tests were performed under different grouting cycles.CTbased three-dimension... Given the high porosity,strong connectivity,and low strength of reef limestone,microbial-induced carbonate precipitation(MICP) reinforcement tests were performed under different grouting cycles.CTbased three-dimensional reconstruction,uniaxial compression,and acoustic emission analyses were employed to elucidate the coupling mechanism between microstructural evolution and macroscopic mechanical behavior.MICP-induced calcium carbonate deposition exhibited distinct scale selectivity,initially occurring in large pores and highly coordinated nodes,which reduced the average pore diameter from 221.26 μm to 75.36 μm and transformed the pore network from a highly connected loose type to a dense isolated one.The elastic modulus increased from 3.27 GPa to 6.21 GPa,and the peak strength approximately doubled,while the failure mode evolved from brittle to brittle–ductile.Acoustic emission analysis revealed a greater proportion of post-peak high-energy events and a frequency shift from high to mid–low ranges,indicating a multi-stage energy dissipation process.A reinforcement variable was introduced to quantify the MICP-induced strengthening,and a structural densification factor was incorporated to establish a constitutive model governed by densification.The study clarifies the coupling mechanism from microscopic densification to macroscopic enhancement,providing theoretical support for the green reinforcement of highly porous rock masses. 展开更多
关键词 Reef limestone MICP Pore structure evolution Grouting cycles Reinforcement variable
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Diffusion of polymer permeation grouting in water-rich sand layers:Mathematical model and experimental validation 认领 引用
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作者 Jiasen Liang Xueming Du +5 位作者 Lei Wang Hongyuan Fang Xiaohua Zhao Bin Li Kejie Zhai Shanyong Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3703-3721,共19页
Water-rich sand layers are frequently encountered as adverse geological conditions during underground construction.Polymer slurry grouting has been widely recognized as an effective technique for reducing permeability... Water-rich sand layers are frequently encountered as adverse geological conditions during underground construction.Polymer slurry grouting has been widely recognized as an effective technique for reducing permeability and enhancing the stability of such strata.In this study,a mathematical model is established to describe the diffusion behavior of polymer slurry in porous media under dynamic water conditions and is further validated through laboratory experiments.The theoretical formulation of the slurry permeation process is developed based on Darcy's law,the Hagen–Poiseuille flow principle,and the physicochemical characteristics of the slurry.The derivation primarily focuses on analyzing the dynamic response of the slurry under the influence of water flow,considering the effects of flow velocity,grouting pressure,and sand-layer porosity on diffusion behavior.To verify the proposed model,a visualized grouting simulation system was designed to observe the diffusion process of polymer slurry in water-rich sand layers.The results demonstrate that slurry diffusion is significantly affected by grouting pressure,porosity,and water flow velocity.The observed staged diffusion characteristics,dynamic evolution patterns,and directional effects are in good agreement with theoretical predictions.Furthermore,the average relative deviations between the theoretical and experimental results for diffusion pressure and diffusion distance are both less than 25%,confirming the reliability of the proposed model.Additionally,this study identifies distinct differences in slurry diffusion between porous and void media.In porous media,slurry propagation encounters greater hydraulic resistance,leading to rapid pressure attenuation and a limited diffusion range.Conversely,diffusion in void media occurs more smoothly due to the continuous cavity structure,resulting in slower pressure decay and a substantially larger diffusion radius.These findings elucidate the mechanisms governing slurry diffusion under dynamic water conditions and provide a theoretical basis for optimizing grouting parameters and improving construction efficiency in water-bearing strata. 展开更多
关键词 Water-rich sand layer Model derivation Permeation grouting Polymer slurry Diffusion mechanism
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Research on the diffusion mechanism of infi ltration grouting in broken rock layers based on the rheological properties of slurry 认领 引用
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作者 Liu Xiang-yang Qian Zi-wei +2 位作者 Tang Bin Lin Jian Wu Yun 《Applied Geophysics》 SCIE CSCD 2026年第2期801-813,872,共13页
The diffusion path and slurry viscosity play crucial roles in determining the diffusion range and reinforcement eff ect of permeation grouting.In this study,the tortuosity eff ect of the diff usion path and the rheolo... The diffusion path and slurry viscosity play crucial roles in determining the diffusion range and reinforcement eff ect of permeation grouting.In this study,the tortuosity eff ect of the diff usion path and the rheological characteristics of the slurry are comprehensively considered,and a theoretical model for the spherical permeation grouting diff usion of Bingham-fl uid slurries is established.The governing equations for the diff usion of rheological slurries are derived and experimentally verifi ed.The results show that the injection pressure increases following an exponential function,initially rising slowly and then increasing rapidly as the diff usion radius expands.In the early stage of grouting,the slurry viscosity is relatively low,and both the injection pressure and the injection rate are the dominant factors controlling the slurry diff usion range.Once the slurry viscosity reaches a certain threshold,viscosity becomes the primary factor governing the diff usion range.Based on these fi ndings,a grouting control strategy is proposed,which involves high-pressure and high-speed injection at the initial stage,followed by low-speed injection in the later stages.This strategy takes into account the formation conditions.In the early phase,a higher grouting pressure and rate are used to enable the slurry to diff use rapidly within the fractured rock mass.Subsequently,the grouting rate is reduced to enhance the slow-penetration and compaction-diff usion eff ect into the surrounding rock.This control measure was applied to the repair and treatment of the fractured surrounding rock in the fl oor of the-1000 m haulage tunnel in the eastern section of Guqiao Mine,achieving favorable engineering eff ects. 展开更多
关键词 the tortuosity eff ect the rheological properties permeation grouting broken surrounding rock guqiao mine
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Formulation,Properties and Mechanism of a New Expanding Agent-activated Backfill Grouting Material for Shield Tunneling 认领 引用
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作者 ZHANG Chiyu ZHANG Jianfeng +4 位作者 LI De MIN Fanlu SHEN Chen ZHANG Yazhou YAO Zhanhu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期805-819,共15页
In the process of backfill grouting for shield tunneling,the hardening and shrinkage of the slurry can easily lead to ground settlement,whereas the secondary grouting prolongs the construction period and increases the... In the process of backfill grouting for shield tunneling,the hardening and shrinkage of the slurry can easily lead to ground settlement,whereas the secondary grouting prolongs the construction period and increases the engineering cost generally.In this study,a new but low-cost strategy to resist the shrinkage of backfill grouting using calcium a sulphoaluminate micro-expansion agent(CAS-H)is innovatively proposed.With the addition of CAS-H at 8%and 20%,the lateral expansion rate of the backfill grouting increased to 1%and 3%at 28 d,respectively.On the contrary,that of the backfill grouting without CAS-H was only about-4%.Simultaneously,CAS-H also increased the density and the impermeability of the hardened slurry significantly.Other essential properties such as the bleeding rate,setting time,fluidity,consistency,strength after hardening and other indicators of the backfill grouting still satisfied the related engineering standards.From the perspective of microstructure,the appearance of C-S-H gel,C4AH13,Aft,Afm and Ca(OH)2 was accelerated by CASH,filling the pores and making the microstructure denser.The hydration heat curve and thermodynamic simulation(GEMS)further validated the other essential beneficial effects of CAS-H,and the cumulative hydration heat of 72 h was calculated to be increased by 29.6%.The hydration degree of cement clinker(C3S,C2S,C3A,C4AF,etc)also increased,which was believed the key reason for inhibiting the shrinkage of the background grouting using the expansion agent-activated strategy. 展开更多
关键词 expanding agent backfill grouting shield tunnelling impermeability microstructure.
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Properties improvement of cement grouts by modified graphene oxide for deep rock grouting 认领 引用
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作者 Bin ZHU Yuanjun MA +1 位作者 Fei XIAO Zhipeng XU 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第5期1054-1073,共20页
The rheological behavior of cement grouts often deteriorates significantly with increasing temperature,particularly during grouting in deep formations.Although traditional superplasticizers are effective in improving ... The rheological behavior of cement grouts often deteriorates significantly with increasing temperature,particularly during grouting in deep formations.Although traditional superplasticizers are effective in improving the flowability of cement grouts,they can also negatively affect its setting.Modified nanomaterials,designed to address the challenge of excessive specific surface area,present a promising alternative.In this study,modified graphene oxide(MGO)is synthesized via free radical polymerization to enhance both the fresh properties and strength performance of cement grouts at elevated temperatures.Polymer chains from Methylallyl Alcohol Polyoxyethylene Ether(MAPE)are copolymerized and covalently grafted onto the hydrophilic hydroxyl and carboxyl groups,to form the MGO.The grafting rate of MGO can be considered around 29%estimated by analyzing the mass loss.Incorporating 0.05 wt%MGO significantly improves the initial rheology of cement grout at elevated temperatures,reduces its time-dependent behavior,and effectively delays the setting,due to the steric hindrance and electrostatic repulsion provided by the polymer chains grafted onto the MGO.Furthermore,MGO can also effectively enhance the strength performance and density of hardened cement grouts under high temperatures.The findings suggest that the MGO can improve the injectability of cement grout under high ground temperatures,thereby enhancing grouting quality in deep underground applications. 展开更多
关键词 cement grout modified graphene oxide rheology compressive strength deep rock grouting
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Shear behavior of concrete-soil interfaces in geopolymer post-grouted bored piles:Insights into green grouting mechanisms 认领 引用
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作者 Pan LI Feiyu LI +3 位作者 Jing WANG Yangyang XIA Mingsheng SHI Junjun MENG 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第6期1193-1209,共17页
Post-grouting technology is an effective method to enhance the bearing performance of the pile foundation,where cement is the most commonly applied due to outstanding performance.However,cement production accounts for... Post-grouting technology is an effective method to enhance the bearing performance of the pile foundation,where cement is the most commonly applied due to outstanding performance.However,cement production accounts for a relatively high proportion of global carbon dioxide emissions,which doesn’t agree with the dual carbon target.Geopolymer is a green and sustainable material,since consisting of natural minerals rich in aluminosilicate and industrial waste.To promoting the application of geopolymer post-grouting technology,this study,based on the actual stress environment of post-grouting bored piles,explores the influence laws of mudcake,grouting volume,grouting pressure,interfacial roughness,normal stress,and grouting material on the shear characteristics of the geopolymer post-grouting concrete–soil interface through the interfacial shear test,and the shear stress–displacement curves are fitted by using a hyperbolic function model.The results showed that the shear stress–displacement curves conformed to the hyperbolic model,with shear stress–displacement behavior following Mohr-Coulomb failure criteria and showing shear hardening.The presence of mudcake significantly reduced the interfacial shear strength,but geopolymer grouting enhanced the interfacial shear strength by 0.52 to 1.66 times and the cohesion by 1.09 to 2.24 times compared with the ungrouted treatment.Sufficient grouting volume and normal stress mitigate mudcake’s adverse effects.Geopolymer grouting improves interface shear strength 1.45 to 2.41 times more than ordinary Portland cement.This study provides theoretical insights and a scientific basis for geopolymer post-grouting pile application,offering an eco-friendly solution to enhance foundation performance. 展开更多
关键词 geopolymer grouting concrete-soil interface shear strength mudcake effects shear stress-displacement model
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Microbially induced carbonate precipitation for soil improvement:Insights from a meter-scale radial grouting trial 认领 引用
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作者 Guijie Sang Rebecca J.Lunn +1 位作者 James M.Minto Grainne El Mountassir 《Biogeotechnics》 2026年第1期27-34,共8页
Despite the growing interest in microbially induced carbonate precipitation(MICP)for geotechnical applications,reports on meter-scale MICP trials for soil improvement remain limited,and controlling and predicting ceme... Despite the growing interest in microbially induced carbonate precipitation(MICP)for geotechnical applications,reports on meter-scale MICP trials for soil improvement remain limited,and controlling and predicting cementation efficiency on a large-scale is even more scarce.This study presented a meter-scale improvement of a poorly-graded sand(initial dry density:1581 kg/m3,porosity:40%)through MICP in a cylindrical cell(diameter:1 m;thickness:15 cm)using a radial flow injection strategy,which involves injecting fluids radially from a single well located at the center while maintaining a constant hydraulic head at the outer boundary.Nine cycles of a two-phase MICP treatment were applied:Phase 1-injection of 0.7 pore volumes(PVs)of bacterial solution and 1-L water pulse;Phase 2-injection of 1.4 PVs of 0.5 mol/L cementing solution in two stages(i)0.7 PV injection two hours after the bacteria were injected,and(ii)a further 0.7 PV injection the following morning after an overnight static reaction period.We observed non-uniform CaCO3precipitations along the distance from the central well and over the depth,which was induced by the decreasing flux towards the outer boundary under the radial flow pattern,along with influences from layered soil packing and hydraulically induced flow channels.CaCO3precipitation with distance from the central well follows a symmetric Gaussian-type distribution,with sufficient cementation to retrieve full-length cores occurring near the midpoint between the central well and the outer boundary.The unconfined compressive strengths of the full-length cores were in the range of 1.2–6.8 MPa with CaCO3contents of 0.08–0.17.Our study suggests that cementation level under radial flow conditions is controllable on a large scale and highly dependent on the injection volume of both bacteria and rinsing water pulse.The study provides a solid baseline for predicting and controlling CaCO3distribution in large-scale MICP soil improvement using a two-phase radial injection approach. 展开更多
关键词 MICP Biocementation Radial flow Large-scale Two-phase grouting CaCO3distribution
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Data-driven analysis of the spatial dependence of grouting efficiency during tunnel excavation 认领 引用
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作者 Huaxin Liu Xunchang Fei Wei Wu 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期106-115,共10页
Grouting with water–cement mixtures is the most widely used and cost-effective method for managing excess water inflow during tunnel construction.Due to uncertain geological and hydrological conditions,current grouti... Grouting with water–cement mixtures is the most widely used and cost-effective method for managing excess water inflow during tunnel construction.Due to uncertain geological and hydrological conditions,current grouting design relies heavily on the experience of onsite engineers.Recent advances in machine learning offer a promising alternative to traditional design to predict grout volume and improve grouting efficiency.Here,an artificial neural network(ANN)model was developed using the data set from an operation tunnel of Jurong Rock Caverns in Singapore to showcase an efficient and physics-guided training strategy.The ANN model was refined by incorporating the spatial scenarios,including the number of grouting holes in four quadrants of tunneling faces,the sequence of grouting screens along the tunnel axis,and the order of grouting rounds on the tunneling faces.The results indicate that an improved training strategy should encompass the grouting process,from Round 1 with grouting holes uniformly distributed around the tunnel periphery,to Round 2 with grouting holes drilled midway between neighboring first-round holes,and to Round 3 with grouting holes determined by onsite engineers.This model,trained based on the order of grouting rounds,performs better than the other models,highlighting the importance of establishing machine learning models grounded in physical principles.The finding was verified by the data set from another operation tunnel and concluded with a perspective on future grouting research. 展开更多
关键词 artificial neural networks grout volume spatial dependence tunnel excavation
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Finite Element Analysis of Mechanical Performance for Sleeve Grouting Connection Nodes in Prefabricated Buildings 认领 引用
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作者 HU Chang 《外文科技期刊数据库（文摘版）工程技术》 2026年第1期127-131,共5页
In the prefabricated concrete structural system, the sleeve grout connection technology is a core construction measure to ensure the continuity of reinforcement and the mechanical performance of joints, with its conne... In the prefabricated concrete structural system, the sleeve grout connection technology is a core construction measure to ensure the continuity of reinforcement and the mechanical performance of joints, with its connection quality directly related to the overall safety and seismic reliability of the structure. Given the limitations of indoor full-scale tests, such as high costs, single parameters, and difficulties in observing internal damage mechanisms, this study selects key influencing parameters including reinforcement anchorage length, grout compressive strength, and reinforcement eccentricity. A systematic analysis is conducted to investigate the influence of parameter variations on joint failure modes, load-displacement curve characteristics, and stress transfer paths. Numerical simulation results demonstrate that the established finite element model can accurately replicate the entire load-bearing process of the joint. When the reinforcement anchorage length reaches 8 times the diameter of the reinforcement, the joint can achieve reinforcement fracture failure, meeting the requirements of Grade I joints as specified in national industry standards. Increasing the grout strength significantly enhances interfacial bonding stiffness but exhibits a diminishing marginal effect on ultimate bearing capacity. The findings of this study provide theoretical basis and data support for the refined design, construction quality control, and connection performance evaluation of sleeve grout joints in prefabricated buildings. 展开更多
关键词 Prefabricated buildings Sleeve grouting connection Finite element analysis Mechanical properties Parametric analysis ABAQUS
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Research on the Water Pressure Diffusion Law and Sealing Grouting Parameters of Annular Gap Leakage in Hydraulic Pressure Pipelines 认领 引用
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作者 CAI Quan 《外文科技期刊数据库（文摘版）工程技术》 2026年第8期123-127,共5页
In response to safety and stability issues caused by annular cracks in hydraulic pressure pipelines, researchers carefully studied the characteristics of water flow propagation within the cracks, built a basic mathema... In response to safety and stability issues caused by annular cracks in hydraulic pressure pipelines, researchers carefully studied the characteristics of water flow propagation within the cracks, built a basic mathematical model to describe the flow of water, and explored in detail the weakening of water pressure within the cracks. And they investigated the effects of different crack shapes and sizes, as well as different environmental conditions, on the speed and direction of water flow. Particular attention was paid to examining the flow characteristics of common grouting materials and their changing patterns over time. Based on the fundamental principles of fluid-solid interaction, a mathematical model of the process by which grouting materials enter the interior of the cracks was established to clearly demonstrate the physical mode by which grouting blockage works. The researchers carefully examined the operating conditions such as grouting pressure and grouting speed, as well as the various effects of adjusting the proportion of grouting materials, and found that each condition had a significant impact on the final blocking effect. Using the scientific method of orthogonal testing, a detailed assessment of the sensitivity of these major operating conditions was made, clearly indicating the order of the impact of each condition on the blocking effect. At the same time, the recommended range of grouting operation parameters suitable for various actual engineering situations was given, and the key technical links that needed special attention in the actual construction process were summarized. The research results obtained above can provide a reliable theoretical basis and technical support for the design work and on-site construction work of using grouting blockage to deal with leakage after annular cracks in hydraulic pressure pipelines. 展开更多
关键词 Hydraulic pressure pipeline Annular gap Leaking water pressure Diffusion law Grouting sealing
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A Novel Quantitative Detection of Sleeve Grouting Compactness Based on Ultrasonic Time-Frequency Dual-Domain Analysis 认领 引用
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作者 Longqi Liao Jing Li +4 位作者 Yuhua Li Yuemin Wang Jinhua Li Liyuan Cao Chunxiang Li 《Structural Durability & Health Monitoring》 EI 2026年第1期138-160,共23页
Quantitative detection of sleeve grouting compactness is a technical challenge in civil engineering testing.This study explores a novel quantitative detection method based on ultrasonic time-frequency dual-domain anal... Quantitative detection of sleeve grouting compactness is a technical challenge in civil engineering testing.This study explores a novel quantitative detection method based on ultrasonic time-frequency dual-domain analysis.It establishes a mapping relationship between sleeve grouting compactness and characteristic parameters.First,this study made samples with gradient defects for two types of grouting sleeves,G18 and G20.These included four cases:2D,4D,6D defects(where D is the diameter of the grouting sleeve),and no-defect.Then,an ultrasonic input/output data acquisition system was established.Three-dimensional sound field distribution data were obtained through an orthogonal detection layout and pulse reflection principles.Finally,a novel quantification detection with a comprehensive defect index(DI)was established by comprehensively considering eight feature parameters,such as time-frequency domain Kurtosis factor(KU),Skewness factor(SK),Formfactor(FF),Crest factor(CF),Impulse factor(IF),Clearance factor(CLF),Wavelet packet energy entropy(WPEE),and Hilbert energy peak(HEP).Construct a DI index by quantifying the difference between defect signals and defect free signals in the time-frequency domain.Experimental results show that,under no-defect conditions,the values of feature parameters are significantly lower than those under defect conditions.Among these,the KU,FF,CF,WPEE and HEP exhibit strong correlations with grout sleeve compactness.The proposed DI index in both types of grout sleeves showed good universality with a linear fit goodness of 0.847–0.962.However,G20 the larger inner diameter and length of the sleeve result in a more complex medium effect during ultrasonic propagation,making its DI index more sensitive to defects than the G18 sleeve.Therefore,the presented method is effective for quantitative detection and analysis of the compactness of grouting sleeves. 展开更多
关键词 Sleeve grout compactness ultrasonic non-destructive testing time-domain dimensionless wavelet packet transform empirical mode decomposition Hilbert-Huang transform
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Impact of Grouting Pipeline Design on the Performance of Suction Bucket Jacket Foundation Grouting 认领 引用
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作者 DING Hong-yan WANG Ting-yuan +1 位作者 ZHANG Pu-yang LE Cong-huan 《China Ocean Engineering》 SCIE EI CSCD 2025年第6期1162-1175,共14页
Suction bucket jacket foundations exhibit considerable potential for implementation in deep-sea offshore wind power projects. To address water film formation resulting from negative pressure penetration during constru... Suction bucket jacket foundations exhibit considerable potential for implementation in deep-sea offshore wind power projects. To address water film formation resulting from negative pressure penetration during construction, certain suction bucket jacket foundation projects implement grouting techniques to ensure adequate bearing capacity. This study conducted a large-scale suction bucket foundation grouting model experiment to examine grout flow characteristics and specific phenomena under various grouting pipeline configurations. Comparative analyses of grouting efficiency and quality across different pipeline layouts identified critical influencing factors and their impact on grouting performance. The results demonstrate that the number of grout outlets should be maintained within an optimal range:insufficient outlets enhance the indentation effect and decrease fill efficiency, while excessive outlets necessitate precise spacing for effective distribution. Additionally, grout outlets should be uniformly arranged to reduce segregation and enhance overall grouting quality. This study's findings provide a scientific foundation for optimizing grouting design in suction bucket jacket foundations, with substantial implications for engineering applications. 展开更多
关键词 suction bucket jacket foundation grouting technique pipeline design flow characteristics grouting efficiency
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An extended discontinuous deformation analysis for simulation of grouting reinforcement in a water-rich fractured rock tunnel 认领 引用 被引量：7
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作者 Jingyao Gao Siyu Peng +1 位作者 Guangqi Chen Hongyun Fan 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第1期168-186,共19页
Grouting has been the most effective approach to mitigate water inrush disasters in underground engineering due to its ability to plug groundwater and enhance rock strength.Nevertheless,there is a lack of potent numer... Grouting has been the most effective approach to mitigate water inrush disasters in underground engineering due to its ability to plug groundwater and enhance rock strength.Nevertheless,there is a lack of potent numerical tools for assessing the grouting effectiveness in water-rich fractured strata.In this study,the hydro-mechanical coupled discontinuous deformation analysis(HM-DDA)is inaugurally extended to simulate the grouting process in a water-rich discrete fracture network(DFN),including the slurry migration,fracture dilation,water plugging in a seepage field,and joint reinforcement after coagulation.To validate the capabilities of the developed method,several numerical examples are conducted incorporating the Newtonian fluid and Bingham slurry.The simulation results closely align with the analytical solutions.Additionally,a set of compression tests is conducted on the fresh and grouted rock specimens to verify the reinforcement method and calibrate the rational properties of reinforced joints.An engineering-scale model based on a real water inrush case of the Yonglian tunnel in a water-rich fractured zone has been established.The model demonstrates the effectiveness of grouting reinforcement in mitigating water inrush disaster.The results indicate that increased grouting pressure greatly affects the regulation of water outflow from the tunnel face and the prevention of rock detachment face after excavation. 展开更多
关键词 Discontinuous deformation analysis(DDA) Water-rich fractured rock tunnel Grouting reinforcement Water inrush disaster
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Effects of elevated ground temperatures on properties of cement grouts for deep rock grouting 认领 引用 被引量：3
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作者 Zhipeng Xu Jianping Sun +2 位作者 Runguo Li Lei He Changwu Liu 《Deep Underground Science and Engineering》 EI CAS CSCD 2025年第2期171-188,共18页
Appropriate determination of the mix ratios of cement grouts is of vital importance to the quality of rock grouting and the risk reduction of groundwater inflow.The behavior of grout,often highly temperature dependent... Appropriate determination of the mix ratios of cement grouts is of vital importance to the quality of rock grouting and the risk reduction of groundwater inflow.The behavior of grout,often highly temperature dependent,is likely to be affected by the elevated ground temperature in deep rock masses.This paper aims to experimentally gain insights into the effects of elevated ground temperatures on the properties of cement grout in fresh and hardened states in deep rock grouting.The results revealed that a temperature of 35°C is crucial for changes in the properties of thick cement grout with a water–cement ratio of less than 0.8.When the temperature is up to 35°C,there can be significant improvements in rheological parameters,acceleration of grout setting,and increase in the rheological time dependence of thick cement grout;however,there may also be a slight impact on the initial grout flowability and the nature of shear thinning.The high temperature may still improve the stability of fresh cement grout and also improve the porosity and creep deformation of hardened cement grout considerably.The proposed constitutive model that couples the Burgers model with a fractional derivativebased Abel dashpot in the series can be used to characterize the creep behavior of hardened cement grout appropriately.The paper provides a valuable reference for optimization of mixture design of cement grouts,thus enhancing deep rock grouting quality and improving safety. 展开更多
关键词 cement grout creep deep rock rheology rock grouting temperature
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Evaluating densification effect of ideal compaction grouting in unsaturated soils by volumetric water content 认领 引用 被引量：1
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作者 Qiong Wang Guang Hu +2 位作者 Shanyong Wang Wei Su Weimin Ye 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第8期5089-5098,共10页
Compaction grouting is primarily applied based on empiricism,and it is challenging to quantify its densification effect.To address this issue,five sets of laboratory model tests on ideal compaction grouting were condu... Compaction grouting is primarily applied based on empiricism,and it is challenging to quantify its densification effect.To address this issue,five sets of laboratory model tests on ideal compaction grouting were conducted,with varying pressures from 400 kPa to 800 kPa,to quantitatively evaluate the densification effect in unsaturated soils.The response of surrounding soil during compaction grouting was monitored.The changes in dry density and void ratio induced by compaction grouting were obtained by monitoring volumetric water content to determine compaction efficiency.In addition,a model was developed and validated to predict the effective compaction range.The results show that soil dry density increased rapidly during compaction grouting before being stabilized at a consistent level.As expected,it is positively correlated with grouting pressures(GPs)and negatively correlated with the distance from the injection point.At higher GPs,the difference in densification effect around the injection point after compaction grouting was significant.Interestingly,variations in ultimate dry density and peak earth pressures perpendicular to the injection direction exhibited axisymmetric behavior around the injection point when comparing the dry density and earth pressure results.Furthermore,soil densification resulted in a decrease in suction.However,no significant effect of GP on suction at different soil positions was observed.Moreover,compaction efficiency decreased with increasing distance from the injection point,showing a strong linear relationship.In addition,the model results for the effective compaction range were basically consistent with the extrapolated values from the experimental results. 展开更多
关键词 Compaction grouting Densification effect Dry density Void ratio Volumetric water content Unsaturated soil
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Resistance of Cement-based Grouting Materials with Nano- SiO2 Emulsion to Chloride Ion Penetration 认领 引用 被引量：1
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作者 LI Shuiping CHENG Jian +2 位作者 WEI Chao YUAN Bin YU Chengxiao 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2025年第1期114-119,共6页
The chloride penetration resistance of cement-based grout materials was improved by nano-silica emulsion.Specimens of mixtures containing different nano-silica particles or emulsions were exposed in sodium chloride so... The chloride penetration resistance of cement-based grout materials was improved by nano-silica emulsion.Specimens of mixtures containing different nano-silica particles or emulsions were exposed in sodium chloride solutions of specific concentrations with different test ages.Hardened properties of the mixes were assessed in terms of weight loss and compressive strength.X-ray diffraction(XRD)and scanning electron microscopy(SEM)of mixes were performed to analysis the phase evolution and microstructure.The results demonstrated that the introduction of nano-SiO2 emulsion significantly decreased the compressive strength loss and calcium hydroxide(CH)crystal content of hydration production,and then enhanced the resistance of cement-based grouting materials to chloride ion penetration.This improvement derives from the filling and pozzolanic effects of nano-SiO2 particles,which were incorporated via an emulsion and attributed to a well dispersion in grouting matrix. 展开更多
关键词 grouting materials nano-SiO2emulsion chloride ion penetration,weight loss strength loss
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Mechanical Performance Analysis of Rubber Elastic Polymer-Polyurethane Reinforced Cement-Based Composite Grouting Materials 认领 引用 被引量：1
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作者 Baoping Zou Jiahao Yin +1 位作者 Chunhui Cao Xu Long 《Journal of Polymer Materials》 SCIE CAS 2025年第1期255-275,共21页
The ongoing operation of subway systems makes existing tunnels vulnerable to deformations and structural damage caused by adjacent foundation pit construction.Such deformations-manifesting as horizontal displacement,h... The ongoing operation of subway systems makes existing tunnels vulnerable to deformations and structural damage caused by adjacent foundation pit construction.Such deformations-manifesting as horizontal displacement,heightened lateral convergence,and internal force redistribution-may significantly compromise subway operational safety.Grouting remediation has become a widely adopted solution for tunnel deformation control and structural reinforcement.Developing optimized grouting materials is crucial for improving remediation effectiveness,ensuring structural integrity,and maintaining uninterrupted subway operations.This investigation explores the substitution of fine mortar aggregates with 0.1 mm discarded rubber particles at varying concentrations(0%,3%,6%,9%,12%,and 15%).Experimental parameters included three water-cement ratios(0.65,0.70,and 0.75)with constant 4%WPU content.Mechanical properties including compressive strength,flexural strength,and compression-to-bending ratio were evaluated across specified curing periods.Material characterization employed Fourier Transform Infrared Spectroscopy(FTIR)spectroscopy for molecular analysis and Scanning Electron Microscopy(SEM)for microstructural examination.Results indicate optimal toughness at 0.70 water-cement ratio with 6%rubber content,meeting mechanical pumping specifications while maintaining structural performance. 展开更多
关键词 Rubber particles polymer polyurethane grouting material mechanical properties
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Corrosion resistance and modification mechanism of modified anchoring grouting material in carbonaceous mudstone environment 认领 引用
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作者 QIU Xiang YIN Qian +5 位作者 XU Hong LI Yao CHEN Jing-cheng WU Yong XIA Xie-hui FU Si-ni 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第11期4486-4499,共14页
In the corrosive environment of carbonaceous mudstone,the mechanical properties of grouting materials in the anchorage section of anchor bolts continue to deteriorate.In response,a cement-based modified anchoring grou... In the corrosive environment of carbonaceous mudstone,the mechanical properties of grouting materials in the anchorage section of anchor bolts continue to deteriorate.In response,a cement-based modified anchoring grouting material(MAGM)with high corrosion resistance was developed.The results reveal that compared with those of ordinary Portland cement(OPC)grouting material,the compressive strength,tensile strength,and shear stress peak of the MAGM increased by 85.9%,44.4%and 45.4%,respectively,after 28 d of corrosion in a carbonaceous mudstone solution.Waterborne epoxy resin and curing agent create a network membrane structure under the action of nano-Al2O3to protect the cement hydration products.In the corrosive environment of carbonaceous mudstone,corrosion products formed on the surface of the stone body have adsorbed onto the reticular membrane structure,filling the pores of the stone body and slowing the erosion rate of ions.After 365 d of application of MAGM and OPC in the corrosive environment of a carbonaceous mudstone slope,the peak shear stress of MAGM is,on average,55.3%greater than that of OPC. 展开更多
关键词 grouting material nanometer material water epoxy resin modification mechanism carbonaceous mudstone
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Weakening Mechanism of Sulfate Ions on Grouting Composites in the Strong Weathering Rock of Submarine Tunnels in a Dynamic Seawater Environment 认领 引用
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作者 LI Peng WANG Cheng-qian +3 位作者 LIU Yong SHENG Yu-ming SUN Yue HE Ling-yao 《China Ocean Engineering》 SCIE EI CSCD 2025年第3期518-528,共11页
Grouting represents a reliable method for strengthening fractured rock masses and preventing seawater infiltration in subsea tunnel engineering. However, grouting composites are continuously subjected to harsh marine ... Grouting represents a reliable method for strengthening fractured rock masses and preventing seawater infiltration in subsea tunnel engineering. However, grouting composites are continuously subjected to harsh marine environments,experiencing both chemical and physical effects from high-concentration erosive seawater ions, elevated water pressure, and complex flow fields. This multi-factor erosion deterioration diminishes the waterproofing capabilities of grouting composites and threatens the service life of subsea tunnel linings. To investigate the erosion deteriortion mechanism induced by sulfate, erosion weakening experiments were conducted using a seawater flow simulation device. The research examined the compressive strength and permeability coefficient of grouting composites under different erosion durations, water-cement ratios, and grouting pressures. In the later stages of the experiment, the strength of grouting composites in the static water erosion control group(SEG) and dynamic water erosion group(DEG) decreased by 31.2% and 18.8%, respectively, compared to the freshwater control group(FG). Futhermore, the permeability coefficient exhibited significant increases. Subsequent microscopic analyses of the eroded grouting composites were performed. This research elucidated the erosion-weakening mechanism of grouting composites subjected to sulfate-induced degradation in complex marine environments. The study emphasizes the critical role of erosion resistance and durability in design and implementation. From practical perspective, this work establishes a foundation for developing enhanced strategies to improve the long-term performance and integrity of grouting composites in subsea tunnel applications. 展开更多
关键词 subsea tunnel grouting composite erosion of sulfate ions dynamic water environment
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