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Thermo-mechanical modelling of spalling around the deposition boreholes in an underground nuclear waste repository during its thermal phase Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-11 M. Cristina Saceanu, Adriana Paluszny, Diego Mas Ivars, Robert W. Zimmerman
This paper presents a three-dimensional numerical analysis of multiple fracture growth leading to the development of excavation disturbed zones and spalling around deposition boreholes in a geological disposal facility. The development of fracture patterns is simulated with the Imperial College Geomechanics Toolkit, a finite-element based simulator that can model the simultaneous nucleation, growth
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Calibrating high-dimensional rock creep constitutive models for geological disaster prevention: An application of data assimilation methods Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-10 Weiya Xu, Changhao Lyu, Jiangjiang Zhang, Huanling Wang, Rubin Wang, Long Yan, Wei-Chau Xie
The study of rock creep phenomena is of paramount importance due to its potential to trigger geological disasters, such as landslides. To predict and prevent such disasters, creep constitutive models are widely employed to comprehend the time-dependent deformation of rocks. These models encompass various mechanical parameters that describe the intricate stress-strain behaviors. Nevertheless, significant
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Micro- and macro-scale fracture behaviour of brittle rocks: Comparison between the conventional Brazilian test and the advanced universal snap-back indirect tensile test (AUSBIT) Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-09 Fauzan Yudho Pratomo, Murat Karakus, Giang D. Nguyen, Ha H. Bui
Post-peak behaviour is crucial for the estimation of rock mass fracturing in cave mining operations where hard rocks can exhibit class-II or snap-back response when subjected to loading. Despite the rapid development of research into class-II rocks under compression, the corresponding behaviour in tensile tests has rarely been investigated, which is critical considering the complexity of rock mass
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Effects of seismic buffer thickness on a circular rock tunnel considering seismic damage form and failure state Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-09 Runfang Sun, Hua Xu, Qixiang Yan, Kai Yang, Chuan Zhang
Conventional seismic designs are currently inadequate to withstand earthquakes in mountain tunnels, which have historically suffered devastating seismic damage. Seismic buffers made of expanded polystyrene geofoam, which are widely used in aboveground structures, have potential applications in tunnels. However, it is not known what the optimal thickness should be, and the seismic effects on such buffers
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Experimental study on Sc-CO2 fracturing of granite under real-time high temperature and true triaxial stress Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-05 Yang Yang, Dawei Hu, Haizhu Wang, Yunteng Wang, Dianbin Guo, Hui Zhou
Sc-CO fracturing would be a potential stimulation method for Hot Dry Rock. A series of Sc-CO fracturing experiments were performed on granite under different temperature and stress conditions. Quantitative and qualitative analysis of injection pressure curves and cracks were conducted to explain the Sc-CO fracturing mechanism under high temperature and high stress conditions. Under the same stress
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Dynamic change in dominant factor controls the injection-induced slip behaviors of rock fractures Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-05 Zhou Fang, Wei Wu
In the geo-energy industry, fluid injection induces different slip behaviors of a rock fracture, from aseismic creep to dynamic slip. The transition from aseismic creep to dynamic slip is explained by the ratio of the stiffness of surrounding rock and the critical stiffness of the fracture. However, numerous studies suggest multiple controls affecting the slip behaviors, and their joint influences
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Effect of artificially induced microcracks near the rock surface on granite fragmentation performance under heating treatment Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-04 Yanliang Li, Jiming Li, Jianming Peng, Dong Ge, Kun Bo
Various novel assisted drilling technologies enhance rock fragmentation performance by introducing microcracks on the rock surface to weaken rock strength. However, the quantitative relationship between artificially induced microcracks and rock fragmentation characteristics is not clear. In this study, we induced artificial microcracks of varying degrees on the rock surface through one-dimensional
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The influence of morphology and the loading-unloading process on discontinuity stress states observed via photoelastic technique and its inspiration to induced seismicity Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-04 Dapeng Wang, Jianchun Li, Chunjiang Zou, Zhijie Wang, Jian Zhao
Stress change in rock mass caused by human activities has the potential to cause the sliding and destruction of faults and joints, resulting in induced seismicity. Laboratory experiments are conducted on a simulated fault with various teeth numbers and undulation angles to uncover the mechanism of stress change-induced seismicity. The potential risk of induced seismicity is explained using three methods:
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Deep transfer learning for P-wave arrival identification and automatic seismic source location in underground mines Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-03 Xu Yang, Sen Li, Anye Cao, Changbin Wang, Yaoqi Liu, Xianxi Bai, Qiang Niu
Seismic monitoring routines provide a robust framework for assessing rock stability and dynamic hazards in underground mining operations. However, the labor-intensive task of manually identifying wave arrivals and the suboptimal selection of geophone arrays do not meet the stringent timeliness and accuracy necessary for seismic source location in such contexts. The precise identification of wave arrivals
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Volumetric response and permeability evolution during carbonation of crushed peridotite under controlled stress-pressure-temperature conditions Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-03 Jinfeng Liu, Timotheus K.T. Wolterbeek, Christopher J. Spiers
Peridotites (olivine-rich rocks) naturally react with CO-rich fluids to eventually form carbonates. Complete conversion involves incorporation of substantial amounts of CO, which requires prolonged fluid flow. Yet, these reactions also cause a large increase in solid volume (63–84 %), raising questions on how they proceed in nature without this excess solid volume clogging fluid pathways. It has been
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High pre-tension reinforcing technology and design for ultra-shallow buried large-span urban tunnels Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-09-02 Qi Wang, Huayong Wei, Bei Jiang, Xuepeng Wang, Lingfeng Sun, Manchao He
Due to the thin overlying formation of ultra-shallow buried large-span urban tunnels, the surrounding rock can be easily loosened and damaged after excavation. High prestressed anchoring support can improve the self-bearing capacity of the surrounding rock. However, traditional bolts often undergo necking fracture after the yield stage and strengthening stage, and the designed pre-tension is low, generally
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A sequence of seismic event triggering in longwall coal mines based on the aftershock cascade theory Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-29 Xu Li, Guangyao Si, Wenzhuo Cao, Wu Cai, Joung Oh, Ismet Canbulat
Seismic events associated with longwall coal mining have not been comprehensively understood, in particular the spatial-temporal relationship between mining-induced seismic events. Current studies on longwall mining-induced seismicity have proposed various spatial-temporal relationships between seismic events, but they may not explicitly follow the Gutenberg–Richter (GR) law for seismic magnitude distribution
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A fuzzy K-Means algorithm based on Fisher distribution for the identification of rock discontinuity sets Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-29 André Monteiro Klen, Stefano Bonduà, Sara Kasmaeeyazdi, Milene Sabino Lana, Danielle Aparecida de Menezes, Pedro Gabriel de Carvalho
Rock discontinuities significantly impact the mechanical and hydraulic behavior of rock masses. A crucial aspect of rock engineering involves classifying discontinuities with similar orientations into groups. For this purpose, clustering algorithms, such as K-Means and Fuzzy K-Means (FKM), have been employed. However, the outcomes of these algorithms are influenced by the selection of initial cluster
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Experimental investigation of tunnel damage and spalling in brittle rock using a true-triaxial cell Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-28 Doandy Yonathan Wibisono, Marte Gutierrez, Dipaloke Majumder
Deep underground excavations in brittle rocks are subject to several ground stability hazards such as spalling and rockburst. These hazards are typically associated with brittle failure mechanisms for hard and massive rock mass. In this study, an experimental investigation has been carried out to evaluate the mechanisms underlying these induced hazards in deep underground excavations. The main objective
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Microstructural evolution and mechanical behaviors of rock salt in energy storage: A molecular dynamics approach Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-28 Zhuyan Zheng, Guibin Wang, Xinyi Hu, Chengcheng Niu, Hongling Ma, Youqiang Liao, Kai Zhao, Zhen Zeng, Hang Li, Chunhe Yang
The microstructure of rock salt significantly influences its macroscopic mechanical behaviors and deformation phenomena. Understanding the deformation and failure characteristics of rock salt at multiple scales is crucial for the secure and efficient functioning of energy storage in salt caverns. Although the macroscopic behaviors of rock salt are well understood, the microstructural changes occurring
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Behaviour of yielding mechanical hybrid rockbolts under complex loading conditions Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-28 Greig Knox, John Hadjigeorgiou
The original “hybrid bolt” was a pragmatic solution to address installation issues in the use of resin grouted rockbolts in heavily fractured ground and the inadequate capacity of friction rock stabilisers. The original hybrid rockbolt involved installing a resin rebar in a friction rock stabiliser. The development of Yielding Mechanical Hybrid Rockbolts has been driven by efforts to eliminate the
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Experimental and theoretical analysis of charge length on single-hole vibration amplitude from underground deep-hole blasting Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-28 Yonggang Gou, Mingzhu Ye, Zhi Yu, Xianyang Qiu, Yumin Chen
Deep-hole blasting, characterized by large diameter and long charge length, is a prevalent practice in large-scale underground mining. However, the increasing charge length in each borehole, together with the growing charge weight, necessitates a heightened focus on the induced vibration effects. Understanding the impact of long charge length on induced vibration in comparison with traditional vibration
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Experimental investigation on the influence of weak interlayers on sandstone rockburst and associated microcracking mechanism Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-27 Fuqiang Ren, Tengyuan Song, Ke Ma, Murat Karakus
Weak interlayers (WI) are common in sedimentary rock masses in deep coal mines. The qualitative effect of the WI on rockbursts is widely acknowledged; however, its influence mechanism still needs further investigation. In the present study, true triaxial unloading rockburst tests of sandstone with WI and calcite veins (CV) were conducted to explore their influence mechanisms. To explore the impact
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The length of fracture process zone deciphers variations of rock tensile strength Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-27 Saeed Aligholi, A.R. Torabi, Mehdi Serati, Hossein Masoumi
Tensile strength is one of the most critical design factors in many rock engineering projects. However, despite many available testing techniques, an accurate estimation of the true tensile strength of quasi-brittle rock-like materials is yet a controversial problem since it can vary by the shape and size of a test specimen, the adopted test method, and applied loading conditions. Different studies
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Analytical solutions of noncircular tunnels in transversely isotropic rheological rock masses Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-26 G.S. Zeng, H.N. Wang, F. Song, A. Rodriguez-Dono, L.R. Alejano
In the field of tunnelling applications, it is often found that the rock masses exhibit anisotropy and rheological properties. To optimize the utilization of underground space, the use of noncircular tunnels is often preferred. However, it is important to note that these noncircular tunnels can lead to high-stress concentrations and significant displacements.
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Fatigue damage evolution behaviors and fractional fatigue mechanical model of monzogabbro under true triaxial disturbance test Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-23 Zhi Zheng, Hongyu Xu, Wei Wang, Guoxiong Mei, Wuqiang Cai, Zhi Tang, Zhiyang Cai
The disturbance wave caused by excavation or blasting of underground surrounding rock causes fatigue degradation effect of rock and eventually leads to disasters. However, the fatigue damage characteristics and fatigue models of rock under true triaxial disturbance are scare. Therefore, a series of true triaxial disturbance tests were conducted to investigate the rock fatigue deformation, strength
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Theory and analytical solutions to wellbore problems with hardening/softening Drucker-Prager models Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-23 Tuan Nguyen-Sy, Jian Huang, Herve Gross
Recognizing and quantifying the elasto-plastic nature of underground formations is critical for various subsurface operations such as drilling, stimulation, production, injection, and storage. In the case of geological CO2 storage, for instance, it is key to identify storage sites characteristics and pumping parameters that lead to safe and perennial CO2 trapping. In this work, we investigate different
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Experimental study on dynamic response of hard rock blasting under in-situ stress Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-23 Huilin Liu, Linqi Huang, Zhaowei Wang, Yangchun Wu, Xibing Li
Deep mine rock mass is in high static stress and dynamic disturbance coupling conditions, its mechanical properties and failure mode is different from the shallow rock mass, which leads to low rock blasting efficiency and engineering geology hazards. In-depth research on the dynamic response of rock blasting under in-situ stress will help to optimize the blasting design, improve the blasting efficiency
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Insight into the dynamic tensile behavior of deep anisotropic shale reservoir after water-based working fluid cooling Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-22 Yide Guo, Xibing Li, Linqi Huang, Arcady Dyskin, Elena Pasternak
During deep shale gas production, flowing water-based working fluid inevitably cools shale reservoirs around boreholes and some fractures, and possible extraction methods induce dynamic stresses. To understand the dynamic tensile behavior of deep anisotropic shale reservoir after water-based working fluid cooling, a split Hopkinson pressure bar was used for performing the dynamic Brazilian tests on
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Analytical solutions considering face advance and time-dependent behavior for back-analysis of convergence measurements in deep circular tunnels under isotropic initial stress state Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-20 Alec Tristani, Jean Sulem, Lina-María Guayacán-Carrillo
A methodology is presented for the back-analysis of convergence measurements in deep tunnels to determine the constitutive parameters of the surrounding rock mass. Since increasing deformations and stresses with time are due to both the face advance and the time-dependent behavior of the ground, the two effects must be considered during the excavations. To that end, an analytical solution assuming
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Polyaxial failure criteria for in situ stress analysis using borehole breakouts: Review of existing methods and development of an empirical alternative Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-20 Maciej Trzeciak, Hiroki Sone
Analysis of compressive wellbore failure, or breakouts, is one of the primary methods of constraining the maximum horizontal stress in deep boreholes. To estimate stress using the observation of breakouts, one needs to measure the breakout width from image logs and use a failure theory to predict the stress that led to the development of the measured breakout. Most commonly, Mohr–Coulomb failure criterion
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Drilling performance analysis of a polycrystalline diamond compact bit via finite element and experimental investigations Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-20 Ahmed Al Shekaili, Yang Liu, Evangelos Papatheou
The significance of improving the drilling productivity and reducing the cost and non-productive time of drilling process, substantially relies on the efficiency of drilling performance. This paper provides a comprehensive understanding of drilling process, aiming to predict drilling performance and investigate drilling parameters using a validated finite element (FE) model. Experimental validation
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Experimental study of poromechanical behavior of Callovo-Oxfordian claystone in undrained triaxial compression and extension tests Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-19 Yuhao Zhang, Shouyi Xie, Nicolas Burlion, Jianfu Shao, Minh-Ngoc Vu, Gilles Armand
The Callovo-Oxfordian (COx) claystone is selected as the host rock in the French project for geological disposal of radioactive waste. In its initial state, the host rock is fully saturated. Due to the low permeability, the pore fluid pressure can locally evolve in a quasi undrained condition due to subsequent mechanical and thermal loading, and then significantly affects deformation and cracking process
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A 3D coupled numerical simulation of energised fracturing with CO2: Impact of CO2 phase on fracturing process Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-19 Feng Xiao, Saeed Salimzadeh, Qian-Bing Zhang
Engineered fractures play a critical role in enhancing energy extraction efficiency. In this study, energised fracturing with CO, as an alternative approach to conventional water-based hydraulic fracturing, is investigated via numerical simulations. We validated the CO finite element-based fracturing model against analytical as well as CO-fracturing laboratory experiments, then utilised the model to
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Experimental study on dilatancy behavior of soft rock under dynamic loading Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-16 Wenzheng Xing, Haozhe Xing, Wuqiang Cai, Xing Li, Yanyu Qiu, Mingyang Wang
Correct understanding of rock dilatation plays a non-negligible role in the safety of rock engineering and the efficiency of geological resources extraction. Although the significance of dilatation under quasi-static loading or unloading conditions is well-studied, its behavior under dynamic loads remains poorly understood. This is largely because conventional dynamic testing system fails to capture
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Long-term deformation of rock salt under creep–fatigue stress loading paths: Modeling and prediction Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-15 Zongze Li, Jinyang Fan, Marion Fourmeau, Jie Chen, Deyi Jiang, Daniel Nelias
Rock salt, due to its water solubility, low permeability, high plasticity, and damage self-healing ability, is one of the best candidate rock types for underground energy storage. Utilizing salt caves to construct compressed air energy storage (CAES) facilities can effectively enhance the utilization of renewable energy. Due to the need for peak shaving, the surrounding rock of the salt cavern will
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Modeling spatial variability of mechanical parameters of layered rock masses and its application in slope optimization at the open-pit mine Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-15 Jinduo Li, Tianhong Yang, Feiyue Liu, Yong Zhao, Honglei Liu, Wenxue Deng, Yuan Gao, Haibin Li
Mining engineering with layered structures often obtains extensive geological data to ensure reliability of mining operations. Effectively utilizing these data to characterize the spatial distribution of mechanical parameters in layered rock mass is crucial for slope stability analysis. This study focuses on the Heishan open-pit mine as a case study, leveraging the distinctive characteristics of mining
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Optimization of a coal mine roof characterization model using machine learning Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-14 Michael Melville, Sanjib Mondal, Micah Nehring, Zhongwei Chen
Predicting areas of increased propensity for roof deformation is crucial for the proactive management of geotechnical risk in underground coal mines. Current practices rely largely on assessing rock mass strength or characterization indices in isolation. Validation of applied ground support systems typically, and in part, comprises a review of observed deformation and analysis of extensometer data
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Experimental analysis of rock fragmentation induced by single percussive impact Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-14 Jorge Aising, Laurent Gerbaud, Hedi Sellami
Understanding fractures creating process during the dynamic indentation of a spherical carbide insert is a key factor to optimize the operation of a percussive drilling system and improve penetration rates and tool life while drilling in hard, abrasive rock formations. This study presents experimental results of dynamic indentation tests with combined action of an impulsive load and a static load of
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Wave transmission in layered composite rock mass comprising parallel joints and different rock materials Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-13 L.F. Fan, X.Y. Shi, M. Wang, F. Jiang
This study investigates wave propagation of layered composite rock mass composed of multiple joints and assorted rock materials. Firstly, the effect of multiple-reflection between joints on wave transmission was explored by modifying the method of characteristics. Secondly, the superposition of direct and indirect transmission induced by multiple-reflection was analyzed. Waveform variations in wave
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Strain rate-dependency of thermal infrared radiation of sandstone subjected to dynamic loading: Insights from a lab testing Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-12 Xin Cai, Jifeng Yuan, Zilong Zhou, Yunming Wang, Liye Chen, Yang Liu, Shaofeng Wang
Rocks are generally deformed and fractured upon various scales of strain rates. Understanding the strain rate effects on the thermal infrared radiation (IR) characteristics of rock materials is crucial for predicting and detecting rock failure. In the study, uniaxial compression experiments were conducted on sandstone samples at different strain rates using an Instron hydraulic servo testing machine
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Experimental investigation on the cyclic shear behavior of intermittent joints Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-12 Bin Wang, Yujing Jiang, Qiangyong Zhang, Hongbin Chen, Richeng Liu
To promote the understanding of the shear behavior of intermittent joints subjected to cyclic shear loads, this paper provides the experimental results of cyclic shear tests in the laboratory. We vary joint configurations and boundary conditions to investigate their effect on the shear behavior and evolution of shear resistance during cyclic shearing. The cyclic shear failure of intermittent joints
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Rate effect of rocks: Insights from DEM modeling Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-08 Yuan Sun, Chung Yee Kwok, Kang Duan
Rocks are subjected to different loading rates at different construction stages and engineering applications. The strength of rock usually increases with loading rate. This rate dependency is one of the time-dependent behaviors of rock, whereby the micro-mechanisms are believed to be the subcritical crack growth due to stress corrosions. However, no evidence is provided yet. This study investigated
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A simplified method for predicting overflow-induced crack propagation in gravity dams using genetic algorithm and material-based model Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-08 Ehsan Badakhshan, Guillaume Veylon, Laurent Peyras, Jean Vaunat
Cracks are always a serious concern in the stability analysis of gravity dams. One of the main reasons for the initiation of cracks is overflows. In evaluating dam safety under flood conditions, it is crucial to consider the balance between the strength of the dam body and the propagation of cracks. In this context, simplified equations serve as valuable tools in dam design as they offer a quick and
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Diffusion mechanism of quick-setting slurry in water-rich fractured rock mass based on circle-outburst diffusion model Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-07 Qingsong Zhang, Changxin Huang, Jun Liu, Lianzhen Zhang, Xiaochen Wang, Yan Pei
Grouting is the most commonly used methods in dealing with water inrush issue in mine and tunnel engineering. In order to better predict the grouting effect, research on slurry diffusion mechanism became a hotspot for scholars. At present, the mainstream theoretical model used to study the slurry diffusion mechanism are the circle diffusion model and the modified ones in plane plate fracture. However
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Preconditioning blasting for rockburst control in a deep shaft sink Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-02 Alex Hall, Brad Simser, Ming Cai, Jared Lindsay
This paper details the preconditioning blasting strategy that was developed and used while sinking the third deepest shaft/winze in Canada in a brittle rock mass. The high-stress conditions presented at the construction site resulted in seismic activity, uncontrolled spalling, and rockbursting. For comparison, muck is thrown away from the face in a lateral development round, leaving the round partially
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Mechanism of hydraulic fracturing for controlling strong mining-induced earthquakes induced by coal mining Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-08-02 Junpeng Zou, Quan Zhang, Yujing Jiang, Yu-Yong Jiao, Sitao Zhu, Guohua Zhang
The complex geological conditions of coal mine, especially the geological characteristics of coal-bearing strata, determine that mining is one of the most hazardous occupations worldwide. Strong mining-induced earthquakes (E ≥ 10 J) frequently occur in coal mines, where the high-strength thick and hard roofs are developed above coal seams. It seriously threatens the safety of underground miners and
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Enhancing stability graphs for stope design in deep metal mines using machine learning Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-31 Xin Zhou, Xingdong Zhao, Qingdong Qu, Yixiao Huang
Stope structural parameters, which are human-controllable, directly impact the safety and economics performance of underground mineral extraction. Current stope design still relies heavily on empirical methods such as stability graphs, due to the complex nature of rock masses and varied stope failure mechanisms. This study aims to enhance stability graphs with machine learning techniques. Firstly,
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Reliability analysis of deep tunnels in spatially varying brittle rocks using interval and random field modelling Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-31 Akshay Kumar, Surabhi Maurya, Gaurav Tiwari
Rock properties are estimated using objective lab/in-situ testing and subjective judgements invoking different types of uncertainties, i.e., aleatory, and epistemic, along them, often indicated by varying information levels. This study presents a unified reliability method to integrate the spatial variability of inputs modelled via alternate uncertainty models (intervals and probability-boxes (p-boxes))
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Characterization of energy-driven damage mechanism and gas seepage in coal under mining-induced stress conditions Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-31 Qijun Hao, Ru Zhang, Mingzhong Gao, Jing Xie, Li Ren, Anlin Zhang, Mengni Wang, Zetian Zhang
Gas seepage and progressive failure of coal are common energy-driven mining phenomena. A comprehensive understanding of the energy-driving mechanism behind the catastrophic behavior of mining-induced coal is fundamental to innovating the technology of coal and gas co-mining. Thus, this study simulated three typical mining stress evolution process in protective coal-seam mining (PCM), top-coal caving
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Crack propagation process and lifetime prediction method of concrete-rock interface under constant loading Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-30 Wenyan Yuan, Wei Dong, Peng Li, Shuai Wang, Lei Wang, Chang Liu
This study investigated the crack propagation processes and established the lifetime prediction methods of the concrete-rock interfaces under constant loading. Firstly, the constant loading tests were performed under three-point bending loading on the composite concrete-rock beams with three kinds of interfaces, i.e. natural, 4 × 4, and 7 × 7 interfaces, and under three constant load levels, i.e. initial
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Propagation of interfered hydraulic fractures by alternated radial-circumferential extensions and its impact on proppant distribution Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-30 Wei Sun, Guangqing Zhang, Buge Du, Min Zhang, Hu Cao, Dawei Zhou, Jianlin Zhao
The fracture extension mechanisms and proppant transport characteristics play key roles for optimizing hydraulic fracturing in unconventional reservoirs. In this work, the visual physical simulation method was used to analyze the 3D dynamic extension processes of multi-stage hydraulic fractures and the subsequent impact on proppant distribution. The interfered fracture in multi-stage hydraulic fracturing
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Anisotropic behavior and mechanical characteristics of the Montney Formation Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-24 Ali Yaghoubi, Mahendra Samaroo, Maurice B. Dusseault
This study investigates the rock mechanics and anisotropic properties of the Montney Formation, Alberta, through two sets of experiments: unconfined compressive strength tests and triaxial compression tests, supplemented by ultrasonic wave velocity measurements. These tests enabled the calculation of dynamic and static stiffness properties and Thomsen anisotropy parameters (ε, δ, γ). Our findings reveal
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Distribution-free estimation for average trace length of rock discontinuities within 3D large sampling window of complex high-steep slope Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-13 Sicong Wang, Shengyuan Song, Baotian Li, Mingyu Zhao, Yongchao Li, Dianze Liu
The trace length as an important indicator reflecting the size of discontinuity, can usually be estimated by setting a sampling window on the surface of the rock mass. However, in high-steep rock slopes with cliffy topography and uneven terrain, traditional methods are difficult to select suitable plane sampling windows. Therefore, estimating the average trace length accurately in this situation has
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Mechanical behavior and thermal damage characterization of granite after flame jet-water cooling treatment Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-11 Xibing Li, Yangchun Wu, Linqi Huang
Flame jet-assisted mechanical rock drilling is expected to solve the hard-rock crushing challenges in underground engineering such as mining, tunneling, and drilling. Therefore, it is important to investigate mechanical behavior of the rock after flame jet-water cooling treatment. In this paper, granite blocks were subjected to flame jet-water cooling treatment, which means the rapid heating of the
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Energy control and block performance optimization of bench blasting Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-11 Ming Tao, Yuanquan Xu, Rui Zhao, Yulong Liu, Chengqing Wu
In this study, rock-like model blast tests with varying toe burdens are conducted and the evolution of blast-induced fractures is analyzed using the digital image correlation (DIC) method. In addition, post-blast fragmentations are image-processed to quantitatively investigate the blasting performance. A three-dimensional numerical model is developed and validated against the experimental results.
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Influence of tectonic stress field on oil and gas migration in the Tahe Oilfield carbonate reservoir: Identification of areas favorable for reservoir formation Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-10 Zijia Zhu, Zhihong Kang, Zhijiang Kang
An understanding of the tectonic stress field distribution in the carbonate reservoirs of the Tahe Oilfield is essential for oil and gas migration and reservoir reconstruction. This study adopts a geological genesis perspective and integrates the unique attributes of the carbonate reservoirs in the Tahe Oilfield to simulate three-dimensional stress fields using the finite element method and Petrel
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Proposed formulas for pillar stress estimation in a regular room-and-pillar pattern Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-10 Ioannis Vlachogiannis, Andreas Benardos
Room-and-pillar mining is one of the oldest and most widely employed underground mining methods worldwide, while in recent years it has also been used for civil engineering projects and applications. The pillar design process is quite straightforward, requiring the assessment of two key elements, namely the pillar's strength and the anticipated loading imposed on it. Lots of research work has been
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A full-field solution to predict vibrations in the presence of a free surface Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-10 S. Gómez, J.A. Sanchidrián, P. Segarra
Blasting is a common activity in mining that can cause significant damage in the remaining rock mass. The most commonly used method for predicting vibrations is the Swedish or Holmberg-Persson approach. It is a simple and fast method that uses empirical formulation to estimate the vibration levels based on the explosive charge weight, distance to the source, and other parameters. However, it has limited
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A micromechanics based model for sandstone under monotonic and cyclic compression Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-09 Y. Shi, W.Q. Shen, J.F. Shao
This work aims to investigate some typical fatigue behaviors of a sandstone under cyclic loading. At the microscopic scale, the heterogeneous sandstone is viewed as a composite comprising a solid matrix and randomly distributed microcracks. Within the framework of thermodynamics, three main dissipation mechanisms, plastic deformation of matrix, microcrack propagation and frictional sliding, are considered
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Bingham and herschel-bulkley fluids flow regimes in rough-walled rock fractures Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-08 Liangchao Zou, Min Tang, Bo Li
Flow of typical non-Newtonian fluids such as cement grouts can experience different regimes as the Reynolds number (Re) changes, understanding of which is important for design and operation of rock grouting in various rock engineering applications. Here, flow regimes of representative non-Newtonian fluids, i.e., Bingham and Herschel–Bulkley (H–B) fluids, are numerically investigated with experimental
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Understanding energy transformation mechanism of rockbursts through experimental and theoretical methods Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-06 Wenju Liu, Fuqiang Gao, Shuangyong Dong, Shuwen Cao
Understanding the energy transformation mechanism in rockbursts is essential for predicting and mitigating potentially catastrophic rock failures. In this study, Double Springs Release Tests (DSRTs) were proposed in a laboratory setting to investigate the energy transformation of rockbursts from inception to development. High-speed cameras and image processing algorithms were utilized to calculate
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Geomechanical properties of laminated shale and bedding shale after water absorption: A case study of the Chang 7 shale in Ordos basin, China Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-04 Pengfei Zhao, Xiangyu Fan, Xingzhi Wang, Xiang Wang, Xin Zhou, Qiangui Zhang, Yufei Chen
There are abundant oil and gas resources in China's continental shale formations, and these formations often contain sandy lamina, tuffaceous lamina and carbonate lamina parallel to the bedding planes, resulting in complex geomechanical properties. During the drilling process, the mechanical weak surface structure inside the shale and the hydration effect of drilling fluid may easily cause wellbore
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Microstructure and mechanical behavior of 3D printed rock-like specimens based on different post-processing methods Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-03 Chen Yu, Wei Tian, Xiaohui Wang
3D printing technology offers a unique advantage in fabricating rock specimens with precise internal defects. However, the low strength and stiffness of sand-type 3D printed samples limit their application in rock mechanics. This study primarily focuses on the microstructural characteristics of the specimens, including changes in pore structure, cementing materials, and brittleness properties. Three
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Experimental investigation of borehole breakout formation in Gosford sandstone Int. J. Rock Mech. Min. Sci. (IF 7.0) Pub Date : 2024-07-02 Zizhuo Xiang, Guangyao Si, Joung Oh, Ismet Canbulat, Charlie C. Li
This study investigates the in-situ borehole breakout formation using true-triaxial laboratory experiments on cubic Gosford sandstone. Four series of tests have been conducted under varying stress conditions following two approaches: PD method (loading onto specimens with pre-drilled boreholes) and PS method (loading onto intact specimens and then conducting drilling). Borehole camera observations