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岩石力学与岩土工程学报（英文版）
岩石力学与岩土工程学报（英文版）

钱七虎

季刊

1674-7755

rockgeotech@whrsm.ac.cn

027-87198182

430071

湖北省武汉市武昌区水果湖街小洪山2号

岩石力学与岩土工程学报（英文版）/Journal Journal of Rock Mechanics and Geotechnical EngineeringCSCDCSTPCD北大核心SCI
查看更多>>反映世界范围内，特别是中国岩石力学与工程的新成就、新理论、新方法、新经验、新动向，促进国内外学术交流，特别欢迎国家重大项目、国家自然科学基金项目及其他重要项目的研究成果，倡导和鼓励有实践经验的作者撰稿，并优先刊用这些稿件，本刊也发表少数侧重于工程应用的土力学方面的文章。为尽快交流最新的学术信息，本刊还发表短文和讨论文章、近期博士学位论文摘要、会议简讯、新书简介与相关的学术动态等；提倡撰写简短的讨论文章，活跃期刊学术氛围。
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    Anisotropic characteristics and creep model for thin-layered rock under true triaxial compression

    Tianxiang SongXia-Ting FengYangyi ZhouChengxiang Yang...
    4815-4834页
    查看更多>>摘要：The failure phenomenon of thin-layered rock tunnels not only exhibits asymmetric spatial characteris-tics,but also significant time-dependent characteristics under high in-situ stress,which is attributed to the time-dependent fracture of thin-layered rocks.This paper conducted a series of true triaxial creep compression tests on typical thin-layered rock siliceous slate with acoustic emission technique to reveal its anisotropic time-dependent fracture characteristics.The anisotropic long-term strength,creep frac-turing process,and fracture orientation characteristics of thin-layered rocks under different loading angles(β,ω)and intermediate principal stress were summarized.A three-dimensional(3D)non-linear visco-plastic creep model for thin-layered rock was developed to simulate its anisotropic creep behavior.The time-dependent fracturing of rocks during true triaxial creep loading is reflected through the change of equivalent strain based on an improved Euler iteration method.By constructing the plastic potential function and overstress index related to loading angles and stress state,the anisotropic time-dependent fracturing process and propagation of thin-layered rocks under different loading angles and intermediate principal stress are expounded.The model was validated experimentally to show it can reflect the long-term strength and creep deformation characteristics of thin-layered rocks under true triaxial compression.
      原文链接:
    • 万方数据
    • 维普

    Corrosion considerations in the capacity of welded wire mesh

    Efstratios KarampinosJohn Hadjigeorgiou
    4835-4851页
    查看更多>>摘要：Ground control in underground mines employs rock reinforcement and surface support to maintain the integrity of excavations for their anticipated working life.The performance of a ground support system,however,is more complex and relies on effective load distribution between reinforcement and surface support elements.Typically,failure of the ground support system is along its weakest link,often the surface support.Consequently,the degradation of any ground support element over time will compro-mise the structural integrity of the ground support system.Degradation of ground support can be due to multiple factors.This paper focuses on the role of corrosion in the long-term performance of mesh.It presents a comprehensive methodology for quantifying the impact of degradation on bolted welded wire mesh over time.This is an important aspect,as the mesh is often the first element that fails in a ground support system.This paper combines information from extensive field and laboratory studies on mesh corrosion with calibrated numerical models to capture the long-term performance of different bolting patterns under a range of corrosion environments.A series of three-dimensional(3D)distinct element models(DEM)were constructed to quantify the impact of different corrosion rate scenarios on the loading capacity,displacement,and failure mechanisms of bolted welded wire mesh in diamond and square bolting patterns.This work can contribute to the management of long-term hazards associated with corrosion of mesh in corrosive environments under non-seismic mining conditions.
      原文链接:
    • 万方数据
    • 维普

    Prediction of brittle rock failure severity:An approach based on rock mass failure progress

    Shengwen QiSongfeng GuoMuhammad Faisal WaqarGuangming Luo...
    4852-4865页
    查看更多>>摘要：This study presents the classification and prediction of severity for brittle rock failure,focusing on failure behaviors and excessive determination based on damage depth.The research utilizes extensive field survey data from the Shuangjiangkou Hydropower Station and previous research findings.Based on field surveys and previous studies,four types of brittle rock failure with different failure mechanisms are classified,and then a prediction method is proposed.This method incorporates two variables,i.e.Kv(modified rock mass integrity coefficient)and GSI(geological strength index).The prediction method is applied to the first layer excavation of the powerhouse cavern of Shuangjiangkou Hydropower Station.The results show that the predicted brittle rock failure area agrees with the actual failure area,demonstrating the method's applicability.Next,it extends to investigate brittle rock failure in two lo-cations.The first is the k0+890 m section of the traffic cavern,and the second one is at K0-64 m of the main powerhouse.The criterion-based prediction indicates a severity brittle rock failure in the K0+890 m section,and a moderate brittle rock failure in the KO-64 m section,which agrees with the actual occurrence of brittle rock failure in the field.The understanding and application of the prediction method using Kv and GSI are vital for implementing a comprehensive brittle rock failure prediction process in geological engineering.To validate the adaptability of this criterion across diverse tunnel projects,a rigorous verification process using statistical findings was conducted.The assessment out-comes demonstrate high accuracy for various tunnel projects,allowing establishment of the correlations that enable valuable conclusions regarding brittle rock failure occurrence.Further validation and refinement through field and laboratory testing,as well as simulations,can broaden the contribution of this method to safer and more resilient underground construction.
      原文链接:
    • 万方数据
    • 维普

    A novel V-cut method for explosive-free breakage of biaxially loaded rock using soundless chemical demolition agents

    Tuo ChenIsaac VennesHani S.Mitri
    4866-4877页
    查看更多>>摘要：Interest in soundless chemical demolition agents(SCDAs),also known as expansive cements,as potentially viable alternatives to explosives for rock fragmentation,has been growing in recent years.Consequently,there is an increasing amount of literature on the use of SCDA for the breakage of rock blocks and boulders.Limited research has been conducted so far on the breakage of excavation fronts,such as tunnel or drift faces,using SCDA.This is due to the perception that the planar compressive in-situ stresses in the face would inhibit the creation and propagation of fracturing due to expansive pressure.This study proposes a novel V-cut method for demolishing rock panels under biaxial stress using SCDA.This method was examined through large-scale tests and numerical modelling.The rock panels were subjected to high biaxial confinements of 26 MPa and 40 MPa.Such a level of confinement corresponds to an in-situ stress state 1000 m below the surface in the Canadian shield.The V-cut drillhole pattern employs two sets of three SCDA holes angled at 45° from the face of a Stanstead granite panel.The drillhole arrangement aims to create a V-shaped wedge in the plane of major principal stress.When angled drillholes are subjected to expansive pressure,they tend to cast out of the panel face,causing fragmentation.Two panels of 1 m x 1 m x 0.25 m were successfully demolished using the proposed method.The three-dimensional fast Lagrangian analysis code FLAC3D modelling was used to reconstruct the panel failure mechanism owing to the V-cut.This study demonstrates the feasibility of fragmenting an excavation front,such as a rock excavation face,with SCDA using a V-cut drill hole pattern while subjected to high biaxial confinement.
      原文链接:
    • 万方数据
    • 维普

    Statistical properties of seismic foreshocks and aftershocks associated with longwall mining:Implications from the Epidemic Type Aftershock Sequence model

    Xu LiGuangyao SiBobo ShiWenzhuo Cao...
    4878-4894页
    查看更多>>摘要：The control and management of mining-induced seismic hazards have attracted ever-rising attention,especially in underground longwall coal mines,where continuous mining activities dynamically alter the stress states and induce seismic events.In this work,the Epidemic Type Aftershock Sequence(ETAS)model was applied to formulate the aftershock catalogue of mining-induced seismicity and investigate the formation of event triggering associated with longwall mining.The conventional Baiesi and Paczuski method(2004)was used to separate longwall mining-induced seismic events into triggered and non-triggered catalogues.The latter catalogue contains both non-triggering(NT)-isolated events that do not trigger subsequent events and NT-parent events of the former catalogue.Statistical properties of triggered events were analysed spatially and temporally.The temporal triggering sequence follows the Omori-Utsu law,where the temporal decay of aftershocks is influenced by the magnitude of NT-parent events in mining-induced seismicity.The spatial distribution of aftershocks follows an inverted U-shaped relationship with distance to their corresponding NT-parent events.The quantitative forecasting of triggered events was performed based on the nonhomogeneous Poisson distribution,which achieved a good consistency with their NT-parent events.Amongst the non-triggered catalogue,NT-isolated events are concentrated ahead of NT-parent events,potentially acting as foreshocks for the latter.
      原文链接:
    • 万方数据
    • 维普

    Decomposing significant factors of Coulomb stress and its components in injection-induced seismicity

    Yao ZhangQi LiYongsheng TanXiaying Li...
    4895-4908页
    查看更多>>摘要：Injection-induced seismicity has been a focus of industry for decades as it poses great challenges to the associated risk mitigation and hazard assessment.The response surface methodology is integrated into the geo-mechanical model to analyze the effects of multiple factors on induced seismicity during the post shut-in period.We investigate the roles of poroelastic stress and pore pressure diffusion and examine the differences in the controlling mechanism between fault damage zones and the fault core.A sensitivity analysis is conducted to rank the selected factors,followed by a Box-Behnken design to form response surfaces and formulate prediction models for the Coulomb stress and its components.Reservoir properties significantly affect the potentials of induced seismicity in the fault by changing pore pressure diffusion,which can be influenced by other factors to varying degrees.Coulomb stress is greater in pressurized damage zones than in fault cores,and the seismicity rate exhibits a consistent variation.Poroelastic stress plays a similar role to pore pressure diffusion in the stability of the fault within the pressurized damage zones.However,pore pressure diffusion dominates in the fault core due to the low rigidity,which limits the accumulation of elastic energy caused by poroelastic coupling.The slip along the fault core is a critical issue to consider.The potential for induced seismicity is reduced in the right damage zones as the pore pressure diffusion is blocked by the low-permeability fault core.However,poroelastic stressing still occurs,and in deep basements,the poroelastic effect is dominant even without a direct increase in pore pressure.The findings in this study reveal the fundamental mechanisms behind injection-induced seismicity and provide guidance for optimizing injection schemes in specific situations.
      原文链接:
    • 万方数据
    • 维普

    Sidewall rockburst characteristics of highly stressed circular tunnel under impact load

    Wuxing WuFengqiang GongZongxian Zhang
    4909-4924页
    查看更多>>摘要：This study investigated the sidewall rockburst characteristics of highly stressed circular tunnel subjected to impact loads resulting from rock blasting or other mining-related dynamic disturbances,aiming at exploring the influence of vertical prestress and dynamic load on sidewall rockburst.Using a biaxial Hopkinson pressure bar(BHPB)system,we studied the sidewall rockburst of a circular tunnel by applying various prestresses(horizontal and vertical static stresses)to a sand prefabricated circular hole specimen,followed by impact loads.The real-time process and strain field of the sidewall rockburst around the specimen were tracked by the high-speed camera and digital image correlation(DIC).The tests reveal that the sidewall rockburst process can be summarized as:calm stage,slab buckling and spalling stage,rock slabs ejection stage,and V-shaped notch formation stage.Furthermore,the sidewall rockbursts exhibit typical dynamic tensile failure.The mechanism of sidewall rockburst under the coupled static-impact loads was summarized,i.e.the static prestress determines the initial stress and strain distribution,and the vertical prestress influences the affected range and strain values of the strain concentration zone;the impact load disrupts the original static stress equilibrium,inducing alterations in the stress and strain of the surrounding rock and triggering sidewall rockburst.
      原文链接:
    • 万方数据
    • 维普

    Changes in shear properties of granite fractures subjected to cyclic heating and air-cooling treatments

    Guo-Hua ZhangZhao-Yang HanSheng-Lian LiLu-Zhao Dan...
    4925-4943页
    查看更多>>摘要：The effects of cyclic heat treatments on the fracture shear behaviors are rarely reported.To enhance our understanding,granite fractures having almost the same roughness were first exposed to cyclic heating at 400 ℃ and air-cooling treatments,and then direct shear tests were performed under four levels of normal loading.The influences of thermal cycles on roughness degradation and shear properties are analyzed.The roughness degradation in the joint roughness coefficient and the three-dimensional(3D)roughness metric exhibit linear increasing tendency with increasing thermal cycles.Typical fracture shear properties,including cohesion and friction angle,peak and residual shear strength,peak and re-sidual shear displacement,and initial and secant shear stiffness,fluctuate generally within the first 10 thermal cycles,followed by gradual decreasing tendencies.The thermal effect on the shear properties become weaker as the number of heat treatments increases from 10 to 80.Nonuniform expansion and shrinkage of mineral grains after thermal treatments produce micro-cracks within the rock matrix and on the rock surface,suggesting that asperities are easier to be sheared-off.Thermal alteration in fracture peak-shear strength could be attributed to the deterioration in rock strengths and the mismatch in opposing fracture walls.The observations would provide better insights into rock friction after high temperatures in geothermal energy exploitation.
      原文链接:
    • 万方数据
    • 维普

    Pore-structure and damage behaviors of cement stone subjected to dry-wet cycles

    Xiaoran LiQiang SunJishi GengYuliang Zhang...
    4944-4954页
    查看更多>>摘要：The stable protection of the walls of high-temperature geothermal wells is a challenging issue for sus-tainably exploiting geothermal resources.However,the cement stone filling layer of the cemented portion of the well deteriorates gradually during geothermal mining due to the dry-wet cycles of the saline geothermal water,reducing the service life of the geothermal well.For this,this paper presented five groups of cement stone cylinders with salt contents of 0％,1％,6％,and 11％,which were subjected to heating to 300 ℃ and 1-5 dry-wet cycles.Nuclear magnetic resonance(NMR)and nonmetallic detection were used to test and analyze the porosity and wave velocity.Additionally,the damage evolution induced by dry-wet cycles was captured based on acoustic emission(AE)data.The experimental results indicated that the heating process primarily resulted in mineral and salt crystal expansion,which in turn caused damage.The damage threshold due to the salt content was found to be 6％.The sudden increase in the thermal stress caused by cooling and deterioration of the tensile strength of the cement column were the key factors in the damage during the cooling process.As the number of cycles increased,the accumulated AE energy moved forward and backward,with decreasing and increasing temperature,respectively.The threshold of signal mutation in the heating process is 200 ℃,and the accumulated AE energy decreases by 11.7％.When the salt content was 0％,1％,6％and 11％,the wave velocity decreased by 19％,27.3％,35.5％and 35.9％,respectively.This study also proposed a damage model,which could provide theoretical support for long-term health monitoring and safety protection of geothermal wells.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Mechanical response of Q2 loess stratum surrounding a hydraulic tunnel under dry-wet cycles

    Sen PengCaihui ZhuLetian ZhaiHaoding Xu...
    4955-4970页
    查看更多>>摘要：Understanding the mechanical response of Q2 loess subjected to dry-wet cycles(DWCs)is the premise for the rational design of a hydraulic tunnel.Taking the Hanjiang-to-Weihe south line project in China as the research background,the microstructure evolution,strength degradation and compression charac-teristics of Q2 loess under different DWCs were investigated,and the fluid-solid coupling analysis of the hydraulic tunnel was carried out using the FLAC3D software.The amplification effect of tunnel sur-rounding soil pressure(SSP)and its influence on the long-term stability of the tunnel under different DWCs were obtained.The results showed that the pore microstructure parameters of the undisturbed and remolded loess basically tend to be stable after the number of DWCs exceeds 3.The porosity of Q2 loess is increased by 26％.The internal friction angle and cohesion of Q2 loess are decreased by 35％and 31％,respectively.The vertical strain of Q2 loess is increased by 55％after considering the DWCs.After the DWCs stabilized,the SSP ratio is increased between 10％and 25％.With the increase in buried depth of the tunnel,the SSP ratio is increased by 8％-10％.The SSP is reduced from 8％to 16％by the rise in groundwater level.As the number of DWCs increases and the burial depth of the tunnel decreases,the distribution of SSP becomes progressively more non-uniform.Based on the amplification factor and the modified compressive arch theory,the SSP distribution model of loess tunnel was proposed,which can be preliminarily applied to the design of supporting structures considering DWCs.
      原文链接:
    • NETL
    • NSTL
    • 万方数据