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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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    Dynamic fracture properties and criterion of cyclic freeze-thaw treated granite subjected to mixed-mode loading

    Zhihui CuiFeng DaiYi LiuBiao Zhang...
    4971-4989页
    查看更多>>摘要：Rock masses in high-elevation or cold regions are vulnerable to the combined effects of freeze-thaw(F-T)weathering and dynamic mixed-mode loading,posing a serious threaten to the safety and stability of geotechnical engineering.In this study,a series of dynamic fracture tests were conducted on notched semi-circular bend(NSCB)granite specimens subjected to different mixed-mode loading and F-T cycles using a split Hopkinson pressure bar(SHPB)test system.The effects of F-T treatment and dynamic mixed-mode loading on the fracture properties of granite,including effective fracture toughness,pro-gressive fracture process,and macroscopic morphology of fracture surface,were comprehensively revealed.The experimental results suggest that the dynamic effective fracture toughness of NSCB specimens is dependent on the loading rate,particularly when the mode Ⅰ loading is dominant.Addi-tionally,the fracture toughness decreases as the number of F-T cycles increases,with an inflection point at 30 F-T cycles.All granite specimens subjected to mixed-mode loading exhibit a curved fracture path,with faster crack propagation speed and more fine cracks in specimens exposed to higher F-T cycles.Macroscopic morphology of fracture surface obtained using three-dimensional(3D)scanning indicates that the fractal dimension of the fracture surface increases with increasing F-T cycles,and the increment is more pronounced for specimens subjected to a higher mode Ⅱ loading component.Moreover,this study compared the fracture resistance of F-T treated granite subjected to dynamic mixed loading using the maximum tangential stress(MTS)criterion and the generalized maximum tangential stress-based semi-analytical(SA-GMTS)criterion.Compared with the MTS criterion,the SA-GMTS criterion shows a more reasonable consistency with the experimental results,with a root mean square error within±7％.
      原文链接:
    • 万方数据
    • 维普

    Impact of supercritical carbon dioxide on the frictional strength of and the transport through thin cracks in shale

    Talal Al ShaflootArjun KohliTae Wook KimAnthony R.Kovscek...
    4990-5003页
    查看更多>>摘要：Understanding the mechanical and transport behavior of thin(i.e.small aperture)cracks slipping under supercritical carbon dioxide(sc-CO2)conditions is essential to evaluate the integrity of sealing forma-tions with buoyant sc-CO2 below and the success of waterless fracturing.The two major items of interest in this work are frictional strength and permeability change of the crack.We used a triaxial cell that permits in situ visualization to conduct and monitor slippage along the faces of narrow cracks subjected to triaxial stresses.Such cracks are analogs to small geological faults.We tested carbonate-rich,1-inch diameter Wolfcamp shale samples that are saw cut 30° to vertical to create a thin crack.Friction co-efficients ranged from about 0.6 to 0.8 consistent with expectations for brittle rocks.The sc-CO2 generally did not alter friction coefficient over the time scale of experiments.From a transport perspective,saturating cracks with sc-CO2 substantially decreased permeability of the crack by 26％-52％,while slip resulted in a variety of permeability responses.Overall,the combined impact of sc-CO2 saturation and slip reduced fault permeability for all tests.Our observations support the notion that the sealing capacity of some caprocks improves when saturated with sc-CO2 and that some slip of small fractures is not necessarily detrimental to caprock integrity.
      原文链接:
    • 万方数据
    • 维普

    A new criterion of rock burst proneness based on residual energy release rate index

    Guangbo ChenJing ZhangWei TangTan Li...
    5004-5026页
    查看更多>>摘要：The natural property of rock material,whether impact occurs,is the key influencing factor of the occurrence of rock burst disaster.To accurately assess rock burst proneness,this study focuses on typical sandstone as the research object.Uniaxial cyclic loading and unloading tests were conducted to measure the elastic strain energy accumulated in sandstone under different stress levels and a relationship be-tween elastic strain energy and stress level was established.The results show that:(1)The peak stress under cyclic loading and unloading conditions is slightly lower than the uniaxial compressive strength.With an increase in the number of cycles,the internal damage of sandstone continues to accumulate,and the mechanical properties such as compressive strength continue to deteriorate;(2)With an increase in stress,the input strain energy,elastic strain energy,and dissipated strain energy also increase;(3)When the stress is low,the increase in elastic strain energy is large and shows a steady growth;with an increase in stress,the increase of elastic strain energy decreases;(4)The square of stress at any time has a good linear relationship with elastic strain energy.According to the relationship obtained from the test,the elastic strain energy at the peak stress time can be obtained;(5)A new criterion for assessing rock burst proneness is proposed:residual energy release rate index WT,which characterizes the energy release per unit time when the rock burst occurs.The intervals for evaluating the rock burst proneness of the re-sidual energy release rate index WT are as follows:WT＜0.025,indicating no rock burst proneness;0.025≤ WT＜0.15,indicating weak rock burst proneness;0.15≤ WT＜2,indicating medium rock burst proneness;WT＞2,indicating strong rock burst proneness;and(6)The rationality of the proposed re-sidual energy release rate index WT is verified by the multi-index method and the multi-sample method,and the proposed residual energy release rate index is used to determine the rock burst proneness of 10 kinds of rock samples.The evaluation accuracy is shown to be high,and it can reflect the actual rock burst proneness
      原文链接:
    • 万方数据
    • 维普

    Sources of high-temperature water and gas inrush during tunnel excavation:A case of Bangfu tunnel in Southwest China

    Guo-Hua ZhangZhong-Zhi XieBo-Wen ZhangYu-Yong Jiao...
    5027-5049页
    查看更多>>摘要：Cases of simultaneous inrush of high-temperature water and harmful gases are infrequently reported in areas without geothermal anomalies,hydrocarbon source rock,or coal measures.For this,we investi-gated the origin,development,and formation of the high-temperature water and harmful gases that rushed into Bangfu tunnel,Southwest China.During excavation of the Bangfu tunnel through the F1-2 fault in sandstone,a significant incident occurred involving a sudden influx of high-temperature water(45.4 ℃)of Na-HCO3 type and harmful gases(CO2,H2S).An extensive geological examination uncovered a fault network extending from the crust to the mantle in the tunnel site area.The site features a sub-stantial presence of both surface water and ground water.Furthermore,within the middle crust at depths ranging from 19 km to 23 km,there are high-temperature ductile melts enriched with fluids and gases.Monitoring and experiments conducted on the harmful gases reveal that the primary source is identified in the crust,with the mantle source being secondary,followed by the atmospheric source being a minimal contribution.The hydrochemical and isotopic composition characteristics of the high-temperature rushed water indicate its evolution was formed through the infiltration of atmospheric precipitation from cold groundwater of the Ca-HCO3 type.The mechanism underlying the formation of the inrush high-temperature water and harmful gases can be outlined as follows.The fault network,spanning from the crust to the mantle,serves as a migration pathway for the inflow substances.Mantle-derived volatiles and high-temperature melts make heat energy facilitate the inrush activity,while groundwater contributes to heat transfer and acts as a medium for gas transport.As mantle-derived volatiles migrate towards the surface through the fault network,they mix with high-temperature melts and crust-derived gases,forming a crust-mantle mixed gas.Through processes such as deep hy-drothermal circulation,shallow hydrothermal circulation,water/rock reaction,near-surface mixing,and dilution,Ca-HCO3 type cold groundwater transforms into high-temperature water of Na-HCO3 type.The methodologies and findings of our research offer insights into the route selection,investigation,and construction of mountain tunneling projects under similar geological conditions.
      原文链接:
    • 万方数据
    • 维普

    Expanded pore-emanated cracking model for brittle failure of sedimentary rocks under triaxial compression

    Esraa M.AlomariKam NgLokendra Khatri
    5050-5060页
    查看更多>>摘要：Brittle fracture and its relationship to deformation and strength have been a fundamental area of research in rock mechanics.This paper presents an expanded pore-emanated cracking model to better understand the fracture behaviors and predict the compressive strength of sedimentary rocks.This proposed model is developed to account for a triaxial compression condition using the triaxial compression test results on sandstone,limestone and siltstone samples from Wyoming,USA and experimental data on sedimentary rocks collected from published literature.The normalized critical crack length is determined from the proposed model through which the peak compressive strength is estimated when the stress intensity at the crack tip reaches a critical value called the fracture toughness.Results indicate that the rock porosity and pore radius have an inverse relationship with the compressive strength.Adopting the porosity-permeability relationship,the pore radius is calculated in terms of porosity and grain size.Next,the effect of grain size is implicitly included in the model and negatively correlated with the compressive strength.Moreover,a new approach is proposed for the estimation of fracture toughness based on the pore radius and confining pressure.The predicted compressive strengths from the proposed model show a good agreement with the measured strengths with a mean bias(i.e.average ratio of the measured to predicted strengths)of 1.014.The influence of φ and KIC on σ1was thoroughly studied using parametric study.The study concludes that the effect of φ is more prominent than KIC onσ1.At a constant porosity of 0.1,the stress ratio decreases from 0.0082 to 0.0078 when KIC increases from 0.1 to 0.2,indicating a 5％decrease in stress ratio.Whereas,at a constant KIC of 0.1,the stress ratio increases from 0.0082 to 0.014 when the porosity increases from 0.1 to 0.2,indicating 71％increases in stress ratio and therefore compressive strength.
      原文链接:
    • 万方数据
    • 维普

    Acquisition of acoustic emission precursor information for rock masses with a single joint based on clustering-convolutional neural network method

    Peiyao XieWeizhong ChenWusheng ZhaoHou Gao...
    5061-5076页
    查看更多>>摘要：The method for precursor information acquisition based on acoustic emission(AE)data for jointed rock masses is of significant importance for the early warning of dynamic disasters in underground engi-neering.A clustering-convolutional neural network(CNN)method is proposed,which comprises a clustering component and a CNN component.A series of uniaxial compression tests were conducted on granite specimens containing a persistent sawtooth joint,with different strain rates(10-5-10-2 s-1)and joint inclination angles(0°-50°).The results demonstrate that traditional precursory indicators based on full waveforms are effective for obtaining precursor information of the intact rock failure.However,these indicators are not universally applicable to the failure of rock masses with a single joint.The clustering-CNN method has the potential to be applied to obtain precursor information for all three failure modes(Modes Ⅰ,Ⅱ and Ⅲ).Following the waveform clustering analysis,the effective waveforms exhibit a low main frequency,as well as high energy,ringing count,and rise time.Furthermore,the clustering method and the precursory indicators influence the acquisition of final precursor information.The Birch hier-archical clustering method and the S value precursory indicator can help to obtain more accurate results.The findings of this study may contribute to the development of warning methods for underground engineering across faults.
      原文链接:
    • 万方数据
    • 维普

    Acoustic emission responses and damage estimation of coal with carbon fiber-reinforced polymer confinement under uniaxial compression

    Ze XiaQiangling YaoXuehua LiLinli Yu...
    5077-5094页
    查看更多>>摘要：Fiber-reinforced polymer(FRP)wrapping is a potential technique for coal pillar reinforcement.In this study,an acoustic emission(AE)technique was employed to monitor coal specimens with carbon FRP(CFRP)jackets during uniaxial compression,which addressed the inability to observe the cracks inside the FRP-reinforced coal pillars by conventional field inspection techniques.The spatiotemporal fractal evolution of the cumulated AE events during loading was investigated based on fractal theory.The re-sults indicated that the AE response and fractal features of the coal specimens were closely related to their damage evolution,with CFRP exerting a significant influence.In particular,during the unstable crack development stage,the evolutionary patterns of the AE count and energy curves of the CFRP-confined specimens underwent a transformation from the slight shock-major shock type to the slight shock-sub-major shock-slight shock-major shock type,in contrast to the unconfined coal specimens.The AE b-values decreased to a minimum and then increased marginally.The AE spatial fractal dimension increased rapidly,whereas the AE temporal fractal dimension fluctuated significantly during the accu-mulation and release of strain energy.Ultimately,based on the AE count and AE energy evolution,a damage factor was proposed for the coal samples with CFRP jackets.Furthermore,a damage constitutive model was established,considering the CFRP jacket and the compaction characteristics of the coal.This model provides an effective description of the stress-strain relationship of coal specimens with CFRP jackets.
      原文链接:
    • 万方数据
    • 维普

    Effect of crystal morphology on cementability and micromechanical properties of calcium carbonate precipitate induced by crude soybean enzyme

    Kai XuMing HuangMingjuan CuiShuang Li...
    5095-5108页
    查看更多>>摘要：Enzyme-induced carbonate precipitation(EICP)has emerged as an innovative soil stabilization tech-nology to precipitate CaCO3 by catalyzing urea decomposition.Although extensive efforts have been made to increase the calcium carbonate content(CCC)formed in the EICP process for the better bio-cementation effect,the cementability and micromechanical properties of CaCO3 are rarely known.A study of the cementitious characteristics and micromechanical properties of CaCO3 precipitates with different mixing percentages of crystal morphology is essential for soil improvement.In the present study,ultrasonic oscillation tests and nanoindentation tests were performed to investigate the cementability and micromechanical properties of CaCO3 precipitate.The results show that the cementability and micromechanical properties of CaCO3 precipitate are related to the composition of the crystal morphology.A high content of calcite is beneficial to improve the adhesion of calcium carbonate precipitate.Calcite has better mechanical properties(elastic modulus,hardness and ductility)than vaterite,and the presence of vaterite can significantly affect the measured value of mechanical properties in nanoindentation tests.The ductility of CaCO3 precipitate induced by crude soybean urease(CSU)is higher than that of CaCO3 precipitate induced by commercially available pure enzyme,suggesting that commercially available pure enzyme can be replaced by CSU for cost-effective field-scale engineering applications.This work can provide insight into optimizing the properties of CaCO3 precipitate from the micro-scale.
      原文链接:
    • 万方数据
    • 维普

    A new bacterial concentration method for large-scale applications of biomineralization

    Hanjiang LaiXingzhi DingMingjuan CuiJunjie Zheng...
    5109-5120页
    查看更多>>摘要：Bacterial suspension is an essential component of microbially induced carbonate precipitation(MICP)-based biocement and a large-scale production is required for field applications.In this study,a new bacterial concentration method is proposed to enable high concentration bacterial suspension to be produced to facilitate field work.By adding low concentration calcium to bacterial suspension,flocs are formed and bacterial cells are adsorbed on the flocs to achieve bacterial concentration.Compared to the traditional bacterial concentration method using centrifugation and freezing-drying method,the pro-posed method can concentrate a large volume of bacterial suspension without using special equipment.The feasibility of this method is verified by bacterial concentration tests,solution tests and sand column treatment tests.The results of both the solution test and the sand column treatment test show that the bacterial suspension concentrated by the proposed method can be effectively used for soil bio-cementation.There is a threshold calcium concentration that allows a complete bacterial concentration for the proposed method,and this threshold calcium concentration tends to increase linearly with the optical density of the cell suspension at a wavelength of 600 nm(OD600).
      原文链接:
    • 万方数据
    • 维普

    Bacterial activity and cementation pattern in biostimulated MICP-treated sand-bentonite mixtures

    Yu ZhangXiangrui XuShiqi LiuYijie Wang...
    5121-5134页
    查看更多>>摘要：The application of microbially induced carbonate precipitation(MICP)in clayey soils has attracted much attention,and many studies used clay as an additive to enhance microbial mineralization efficiency in sandy soils.Within the sand-clay-bacteria-calcite system,the property and content of clay play crucial roles in affecting bacterial growth and calcite formation.More important,bentonite is particularly sensitive to changes in the geochemical environment.In this study,the sand-bentonite mixtures were treated by biostimulated MICP,aiming to provide insights into the behavior of this system.The bacterial activity and cementation pattern at different bentonite contents were evaluated through a series of tests such as enrichment tests,unconfined compressive strength(UCS)tests,cementation content measure-ments,mercury intrusion porosimetry(MIP)tests,scanning electron microscopy(SEM)observations,and energy dispersive X-ray spectroscopy(EDS)analyses.The findings showed that the bentonite presence promoted the enrichment of indigenous ureolytic bacteria,with lower bentonite levels enhancing ure-olytic activity.Macroscopic and microscopic characterization indicated that the bentonite-coating sand structure was more conducive to the formation of large-sized calcite crystals capable of cementing soil particles compared to sand-supported and bentonite-supported structures.Additionally,excessive cal-cium ions(Ca2+)concentrations in the cementitious solution would lead to predominant calcite depo-sition on soil particle surfaces,contributing minimally to strength improvement.
      原文链接:
    • NETL
    • NSTL
    • 万方数据