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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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Numerical investigation of geostress influence on the grouting reinforcement effectiveness of tunnel surrounding rock mass in fault fracture zones 认领 引用 被引量：5
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作者 Xiangyu Xu Zhijun Wu +3 位作者 Lei Weng Zhaofei Chu Quansheng Liu Yuan Zhou 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第1期81-101,共21页
Grouting is a widely used approach to reinforce broken surrounding rock mass during the construction of underground tunnels in fault fracture zones,and its reinforcement effectiveness is highly affected by geostress.I... Grouting is a widely used approach to reinforce broken surrounding rock mass during the construction of underground tunnels in fault fracture zones,and its reinforcement effectiveness is highly affected by geostress.In this study,a numerical manifold method(NMM)based simulator has been developed to examine the impact of geostress conditions on grouting reinforcement during tunnel excavation.To develop this simulator,a detection technique for identifying slurry migration channels and an improved fluid-solid coupling(FeS)framework,which considers the influence of fracture properties and geostress states,is developed and incorporated into a zero-thickness cohesive element(ZE)based NMM(Co-NMM)for simulating tunnel excavation.Additionally,to simulate coagulation of injected slurry,a bonding repair algorithm is further proposed based on the ZE model.To verify the accuracy of the proposed simulator,a series of simulations about slurry migration in single fractures and fracture networks are numerically reproduced,and the results align well with analytical and laboratory test results.Furthermore,these numerical results show that neglecting the influence of geostress condition can lead to a serious over-estimation of slurry migration range and reinforcement effectiveness.After validations,a series of simulations about tunnel grouting reinforcement and tunnel excavation in fault fracture zones with varying fracture densities under different geostress conditions are conducted.Based on these simula-tions,the influence of geostress conditions and the optimization of grouting schemes are discussed. 展开更多
关键词 Numerical manifold method(NMM) Grouting reinforcement Geostress condition Fault fracture zone Tunnel excavation
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Numerical Simulation of Surrounding Rock Deformation and Grouting Reinforcement of Cross-Fault Tunnel under Different Excavation Methods 认领 引用 被引量：1
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作者 Duan Zhu Zhende Zhu +2 位作者 Cong Zhang LunDai Baotian Wang 《Computer Modeling in Engineering & Sciences》 SCIE EI 2024年第3期2445-2470,共26页
Tunnel construction is susceptible to accidents such as loosening, deformation, collapse, and water inrush, especiallyunder complex geological conditions like dense fault areas. These accidents can cause instability a... Tunnel construction is susceptible to accidents such as loosening, deformation, collapse, and water inrush, especiallyunder complex geological conditions like dense fault areas. These accidents can cause instability and damageto the tunnel. As a result, it is essential to conduct research on tunnel construction and grouting reinforcementtechnology in fault fracture zones to address these issues and ensure the safety of tunnel excavation projects. Thisstudy utilized the Xianglushan cross-fault tunnel to conduct a comprehensive analysis on the construction, support,and reinforcement of a tunnel crossing a fault fracture zone using the three-dimensional finite element numericalmethod. The study yielded the following research conclusions: The excavation conditions of the cross-fault tunnelarray were analyzed to determine the optimal construction method for excavation while controlling deformationand stress in the surrounding rock. The middle partition method (CD method) was found to be the most suitable.Additionally, the effects of advanced reinforcement grouting on the cross-fault fracture zone tunnel were studied,and the optimal combination of grouting reinforcement range (140°) and grouting thickness (1m) was determined.The stress and deformation data obtained fromon-site monitoring of the surrounding rock was slightly lower thanthe numerical simulation results. However, the change trend of both sets of data was found to be consistent. Theseresearch findings provide technical analysis and data support for the construction and design of cross-fault tunnels. 展开更多
关键词 Cross-fault tunnel finite element analysis excavation methods surrounding rock deformation grouting reinforcement
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Practical Research on Grouting Reinforcement Technology in Highway Tunnel Construction 认领 引用
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作者 JUKai WANGQian 《外文科技期刊数据库（文摘版）工程技术》 2022年第5期175-178,共4页
With the rapid development of the current society, it also drives the development of the scientific field, and the science and technology used in many fields have also undergone great changes. With the development and... With the rapid development of the current society, it also drives the development of the scientific field, and the science and technology used in many fields have also undergone great changes. With the development and progress of the society in recent years, people's living standards are also constantly improving, which leads to a gradual increase in the demand for roads. With the increase of the number of vehicles, such a sharp increase in traffic volume also requires that the construction of roads must be combined with the actual development needs at present. Because the weight of vehicles will have an impact on highway bridges, the increased load will easily lead to more problems in the use of these buildings, and will adversely affect the later use, thus causing some safety problems. At present, grouting reinforcement technology, which is often used in bridge tunnel construction, has obvious advantages, and it is widely used in highway bridge tunnel construction because of its advantages of simple construction and good effect. 展开更多
关键词 highway bridge and tunnel construction grouting reinforcement technology
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Structural deterioration and instability in grouted reinforcement crushed rock masses subjected to increasing-amplitude fatigue loading 认领 引用
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作者 LI Ju-zhou LI Chang-hong +2 位作者 TAHERI Abbas LI Peng MA Dan 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第2期783-801,共19页
To investigate the influence of different Talbot grading indices(n-values)on the fatigue damage deterioration and instability behavior of grouted reinforcement body,an increasing-amplitude fatigue loading test was con... To investigate the influence of different Talbot grading indices(n-values)on the fatigue damage deterioration and instability behavior of grouted reinforcement body,an increasing-amplitude fatigue loading test was conducted on grouted reinforcement specimens with different n-values using the multi-functional electro-hydraulic servo-controlled rigidity test system(MTS-815).Acoustic emission(AE)technology was employed to monitor the entire testing process.The fatigue mechanical response mechanism,AE characteristic parameters,and damage modes were analyzed.The results demonstrate that as n-value increases,the mechanical characteristics of the specimens initially increase and then decrease.AE parameters,including the cumulative AE ring counts and energy counts,follow the same trend,and spectral characteristics exhibit a strong correlation with crack evolution.The cumulative AE ring counts damage model reveals a three-phase behavior for the specimens under different n-values.The b-value,which characterizes the scale distribution of cracking events,correlates with the volumetric strain growth rate,showing a more sensitive response.Differences in n-values directly affect the distribution of RA/AF signals and damage modes.The findings provide valuable insights into predicting the destabilization of grouted reinforcement specimens under fatigue disturbance and offer necessary theoretical support for the design and stability control of excavation in fragmented surrounding rock. 展开更多
关键词 grouted reinforcement specimens Talbot grading indices fatigue loading b-value damage model
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Characterization of load-bearing and failure properties of fractured rock masses reinforced by negative pressure grouting 认领 引用 被引量：1
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作者 Juejing Fang Ke Yang +4 位作者 Farhad Aslani Xin Lyu Xiang He Guiquan Li Jiqiang Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第7期4261-4272,共12页
Grouting injection is a vital technique for addressing the challenges of high stress and significant deformation in the surrounding rock during deep mining operations,playing a crucial role in promoting green and low-... Grouting injection is a vital technique for addressing the challenges of high stress and significant deformation in the surrounding rock during deep mining operations,playing a crucial role in promoting green and low-carbon extraction methodologies.In this study,grouting reinforcement processes were examined by conducting grouting experiments on a fractured rock with varying negative pressures(0-100 kPa),followed by uniaxial compression testing of the grout-reinforced bodies.This investigation explored the diffusion patterns of grout under negative pressure and established a constitutive model of damage-bearing capacity for bodies reinforced by negative pressure grouting.It further studied the enhancement effect of negative pressure on the load-bearing capacity of the reinforced bodies and analyzed the instability mechanism of damage and failure in these bodies.The results indicated that the diffusion of grout under negative pressure is influenced by four types of forces,which alter the extent of grout diffusion within the fractured rock mass.Introducing a damage constitutive model that serially connects pore and framework elements characterizes the damage and failure behavior of groutreinforced bodies under different negative pressures.As the negative pressure increases,changes in porosity,water-to-cement ratio,and admixture quantity occur in the grout-reinforced specimens,with the strength mean curve showing a trend of first increasing and then decreasing,reaching a threshold at a negative pressure of 60 kPa.With increasing negative pressure,the negative pressure damage variable decreases and then increases,and the stronger the interfacial microelement connections caused by the negative pressure,the greater the bearing capacity,ultimately manifesting in different failure modes. 展开更多
关键词 Grout reinforcement Mechanical properties Constitutive model
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Compressive-shear damage and acoustic emission response of grouted concrete in fault zones:Coupling effects of aggregate content and particle size 认领 引用
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作者 Xiaojun Feng Shuaishuai Zhou +4 位作者 Weitao Yue Chunjie Wu Haopeng Chen Yansen Lou Enyuan Wang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第7期1359-1385,共27页
Understanding aggregate effects within fault fracture zones is crucial for assessing fault reactivation risks in grouted deep coal mines.This study investigates the compressive-shear damage mechanisms of grouted concr... Understanding aggregate effects within fault fracture zones is crucial for assessing fault reactivation risks in grouted deep coal mines.This study investigates the compressive-shear damage mechanisms of grouted concrete specimens with varying aggregate contents(20%,40%,60%)and particle sizes(1-5 mm,6-10 mm).Uniaxial compressive-shear tests were monitored synchronously using digital image correlation(DIC)and acoustic emission(AE).Additionally,a calibrated PFC2D discrete element model,incorporating matrix,aggregate,and interfacial transition zones,elucidated the mesoscale mechanisms.Results indicate:(1)peak shear load decreases linearly(R2>0.86)with increasing aggregate content,dropping 64.3%from 20%to 60%,driving a transition from brittle to plastic failure;(2)AE b-value evolution tracks progressive damage,while damage rate k exhibits contrasting size-dependent trends;(3)macroscopic failure modes are synergistically controlled by aggregate size and content;and(4)numerical simulations validate the mesoscale mechanical origins of this brittle-to-plastic transition.These findings reveal the micro-mechanical mechanisms of anisotropic failure and re-strengthening in grouted fault materials,offering vital geological insights into stress evolution and instability precursors during fault reactivation. 展开更多
关键词 Fault grouting reinforcement Compressive-shear damage Aggregate effects Acoustic emission Multi-scale simulation
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Experimental Study on Mechanical Characteristics of Cracked Rock Mass Reinforced by Bolting and Grouting 认领 引用 被引量：2
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作者 HAN Li-jun HE Yong-nian 《Journal of China University of Mining and Technology》 2005年第3期177-182,共6页
The stress hardening characteristics of the reinforced rock mass in uniaxial compression tests were revealed by means of the experimental study on mechanical characteristics of cracked rock mass reinforced by bolting ... The stress hardening characteristics of the reinforced rock mass in uniaxial compression tests were revealed by means of the experimental study on mechanical characteristics of cracked rock mass reinforced by bolting and grouting. And the load-beating mechanism of the reinforced rock mass was perfectly reflected by the experiment. The results can offer some useful advice for support design and stability analysis of deep drifts in unstable strata. 展开更多
关键词 stress hardening reinforcement by bolting and grouting displacement constraints cracked rock mass structural effect
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Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks 认领 引用 被引量：3
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作者 Maolin Tian Shaojie Chen +1 位作者 Lijun Han Hongtian Xiao 《Deep Underground Science and Engineering》 2024年第1期53-69,共17页
The fractured surrounding rocks of roadways pose major challenges to safe mining.Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks.The aim of ... The fractured surrounding rocks of roadways pose major challenges to safe mining.Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks.The aim of this study is to develop highly efficient composite ultrafine cement(CUC)grouts to reinforce the roadway in fractured surrounding rocks.The materials used are ultrafine cement(UC),ultrafine fly ash(UF),ultrafine slag(US),and additives(superplasticizer[SUP],aluminate ultrafine expansion agent[AUA],gypsum,and retarder).The fluidity,bleeding,shrinkage,setting time,chemical composition,microstructure,degree of hydration,and mechanical property of grouting materials were evaluated in this study.Also,a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock.The results have shown that the addition of UF and US reduces the plastic viscosity of CUC,and the best fluidity can be obtained by adding 40%UF and 10%US.Since UC and UF particles are small,the pozzolanic effect of UF promotes the hydration reaction,which is conductive to the stability of CUC grouts.In addition,fine particles of UC,UF,and US can effectively fill the pores,while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout.The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts.Finally,the CUC22‐8 grout was used to reinforce the No.20322 belt roadway.The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway.In this research,high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives. 展开更多
关键词 broken surrounding rock composite ultrafine cement(CUC)grouts grouting material grouting performance grouting reinforcement
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Support failure of a high-stress soft-rock roadway in deep coal mine and the equalized yielding support technology: a case study 认领 引用 被引量：34
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作者 Lihui Sun Haoyuan Wu Bensheng Yang Qiangqiang Li 《International Journal of Coal Science & Technology》 CAS 2015年第4期279-286,共8页
Abstract There are many soft-rock roadway coal mines in China. The surrounding rocks of the high-stress soft-rock roadways in deep mine are especially difficult to be supported using the traditional supporting way. In... Abstract There are many soft-rock roadway coal mines in China. The surrounding rocks of the high-stress soft-rock roadways in deep mine are especially difficult to be supported using the traditional supporting way. In this study, the south wing rail roadway on the second level of Yunjialing coal mine in China was used as an example to analyze the deformation and failure characteristics and influencing factors of roadway. On this basis, this study proposed the equalized yielding support idea which employs the yielding rings to realize the pressure equalization on the bolts and cables in the section. To achieve this purpose, the first bolt-mesh-cable equalizing pressure yielding support was integrated with the second grouting reinforcement. The results proved that the yield rings of the bolts and cables on the spandrel of the arched roadway firstly developed yielding deformation; then the deformation extended to the vault of the roadway; the bolts and cables achieved a yielding extreme value of 15 and 18 tonnes, respectively. The roadway surrounding rock tended to be stable at the 26th day after the maintenance. The equalizing pressure yielding supporting technology plays a moderate pressure-releasing and actively controlling role on the surrounding rocks in the soft-rock roadway with large deformation. 展开更多
关键词 Deep-well high-stress Soft-rock roadway Equalized yielding support Grouting reinforcement
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Accident Analysis and Emergency Response Effect Research of the Deep Foundation Pit in Taiyuan Metro 认领 引用
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作者 ZHANG Xiaoshuang FENG Chao +1 位作者 HAN Yunshan ZHANG Jun 《Journal of Donghua University(English Edition)》 CAS 2020年第3期199-206,共8页
Taking the deep foundation pit accident occurring at a station of metro Line 2 in Taiyuan as an example,the influence of the seepage and inrush of the foundation pit on the retaining structure and surrounding environm... Taking the deep foundation pit accident occurring at a station of metro Line 2 in Taiyuan as an example,the influence of the seepage and inrush of the foundation pit on the retaining structure and surrounding environment were studied under the geological conditions of the confined aquifer on the east coast of Fenhe River.The causes of deep foundation pit accident were also analyzed systematically based on the monitoring data,and various emergency measures were proposed to control the occurrence of secondary accident for deep foundation pit.The results showed that the occurrence of inrush for foundation pit was mainly caused by the insufficient dewatering.The development of the accident was effectively controlled by the adding of the dewatering wells,local grouting of retaining structure to stop seepage,surface grouting to reinforcement and uplift soil.The successful experience can provide some guidance to the construction of similar projects in the proposal. 展开更多
关键词 metro station deep foundation pit inrush seepage grouting reinforcement
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Field Investigations on Integrated Construction and Monitoring Technique for a Highway Tunnel Passing Through Soft Fractured Ground 认领 引用
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作者 ZHAO Cui GAO Yong-tao QI Wen-rui 《Journal of Highway and Transportation Research and Development(English Edition)》 2021年第4期96-110,共15页
Disasters such as collapse and water inrush are prone to occur when tunnel crosses the soft fault fractured ground.To settle the difficulties encountered in the construction of a highway tunnel crossing the F139 fault... Disasters such as collapse and water inrush are prone to occur when tunnel crosses the soft fault fractured ground.To settle the difficulties encountered in the construction of a highway tunnel crossing the F139 fault broken zone,the comprehensive advanced geological predictions,construction measures and real-time monitoring and measuring systems are conducted in field using tunnel seismic prediction(TSP),ground penetrating radar(GPR),three-bench seven-step method,3D laser scanning technology,etc.The results demonstrate that the tunnel,starting from the mileage YK20+490,will get into the core influence zone of the F139 weakly fault broken zone.The development of the fractured structural surface and the water-rich condition are in front of the working face visually characterized based on comprehensive geological prediction.Ensuring that the tunnel passes through the F139 fault fractured zone with smoothness and safety,the implementation of comprehensive construction measures effectively curbs the occurrence of disasters of collapse and water inrush in tunneling.According to the comprehensive monitoring and measuring systems,the vault settlement and the horizontal convergence both show a sharp increase firstly,then remain a steady trend,followed by a slowly increase,and finally a stabilization.The maximum vault settlement and convergence displacements are 39.1 mm and 37.5 mm,respectively,which meets the allowable deformation specifications.After 15 days of excavation and support,the accumulated deformation of the surrounding rock shows a law of first increasing and then decreasing from the left wall to the vault to the right wall.The deformation near the vault is the largest with 21~23 mm,and the deformation near the side wall is the smallest with only 4 mm. 展开更多
关键词 tunnel engineering disaster treatment field tests fault fracture zone comprehensive advanced geological prediction grouting reinforcement 3D laser scanning
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Combined active and passive support technology and its application for deformation control in large-section weakly cemented tunnel 认领 引用
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作者 Qing Ma Wei Zhang +3 位作者 Xiaoli Liu Weiqiang Xie Ruosong Wang Jinpeng Zhao 《Underground Space》 SCIE EI CSCD 2026年第2期1-23,共23页
The development of large cross-section tunnels is an inevitable trend driven by the intensification of coal mining activities and advancements in mining equipment technology.However,the disturbance stress exerted by a... The development of large cross-section tunnels is an inevitable trend driven by the intensification of coal mining activities and advancements in mining equipment technology.However,the disturbance stress exerted by adjacent caverns has a more pronounced impact on weakly cemented rock strata in the vicinity of neighboring tunnels.To mitigate deformation in weakly cemented tunnels,grouting and the installation of long anchor cables were employed to reinforce the self-supporting capacity of the surrounding rock,thereby establishing an active support layer.Additionally,U-shaped steel frames combined with the subsequent application of flexible filling materials were utilized to aid the surrounding rock in mobilizing its self-supporting capacity,which resulted in the formation of a passive support layer.A layered collaborative control methodology integrating both active and passive support mechanisms was developed and implemented in engineering practice.The findings demonstrate that the vertical stress was alleviated after cavern excavation and was predominantly transferred toward the adjacent tunnel,with the influence zone extending approximately 7 to 12 times the tunnel height.Conversely,the horizontal stress is primarily dispersed laterally,affecting a region approximately 3 to 6 times the tunnel width.Following the infilling of pebbles between the U-shaped steel frame and the adjacent rock mass,the maximum compressive stress experienced by the U-shaped steel frame decreased by 50%.Additionally,the spatial extent of the maximum axial force was reduced by 65%,whereas the stresses within the rock bolts and cable bolts increased by 30%and 40%,respectively.Grouting reinforcement contributed to bonding and compaction effects on the delamination and fracturing of the roof strata,with the grout predominantly distributed within a range of 1.5 to 5 m from the central region of the roof.The research outcomes presented in this paper can provide valuable reference for a large-section weakly cemented tunnel. 展开更多
关键词 Weakly cemented rock Large cross-section caverns Large deformation tunnel Active-passive collaborative control Grouting reinforcement
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