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A numerical simulation approach of energy-absorbing anchor bolts for rock engineering Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-08-10 Weiteng Li, Xiuming Li, Yuchun Mei, Gang Wang, Wendong Yang, Hongtao Wang
Energy-absorbing anchor bolts are widely used in geotechnical engineering, but there is no effective numerical simulation approach for evaluating them at the engineering application level. According to typical laboratory test results, the energy absorption criterion (F ≥ Fy) and breakage criterion (δ ≥ δf) are defined. The constant resistance energy absorption mechanical model and the increasing resistance
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An update of the 3D analytical solution for the design of barricades made of waste rocks Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-08-08 Yulong Zhai
Stope backfilling is increasingly used in underground mines. Barricades are necessary to retain slurried backfill poured in mine stopes. In Canada, waste rock barricades (WRB) have been becoming more and more popular to retain paste backfill in stopes. A few solutions have been developed to size the WRB. Among them, a solution developed by Yang and coworkers in 2017 is particularly relevant. However
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Numerical simulation of rock erosion performance of a high-speed water jet using an immersed-body method Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-08-06 Jiansheng Xiang, Bin Chen, John-Paul Latham, Christopher Pain
Water jet drilling (WJD) is an effective technique for drilling micro-holes in the subsurface for reservoir stimulation. This study aims to investigate numerically the failure mechanism of rock during WJD and to assess the WJD performance before drilling. A 3D fluid-solid coupling model is developed for simulating WJD by coupling a mechanical solver based on the combined finite-discrete element method
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Novel multi-field coupling high-voltage electric pulse fracturing coal–rock permeability enhancement test system Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-08-05 Li Jia, Shoujian Peng, Jiang Xu, Fazhi Yan, Jing Zhou, Jieren Chen
With the significant development of coal mining, complex coal reservoir environments with a high gas content, high stress, and low permeability increase the difficulty in efficient and large-scale extraction of gas. To further study the mechanism of coal–rock fracturing using a high-voltage electric pulse (HVEP) and to determine the influence of the HVEP on the permeability enhancement, a multi-field
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A micromechanics-based model for concrete-rock interface with similar triangular asperities Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-08-01 Heng Zhao, Jichao Hou, Minghua Zhao
Direct shear tests on samples containing similar triangular asperities have been carried out under constant normal stiffness (CNS) conditions, and observations demonstrated that there exists local lift-off of shallower asperities across the interface, resulting in a redistribution of local stresses and further impacting the global shear behavior. This study further modifies the existing theoretical
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The role of prior creep duration on the acoustic emission characteristics of rock salt under cyclic loading Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-31 Kai Zhao, Hongling Ma, Chunhe Yang, J.J.K. Daemen
This study aimed to investigate the acoustic emission (AE) behavior of rock salt under combined creep and fatigue. The loading path was in a stress-controlled mode and contained a constant stress load with different durations, followed by cyclic loading. The AE counts, peak frequency, amplitude, b-value, and RA (rise time/amplitude)-AF (average frequency) distribution were systematically analyzed.
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Analysis of slope fracturing under transient earthquake loading by random discrete element method Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-30 Tao Zhao, Giovanni B. Crosta, Yong Liu
Earthquake can cause significant rock fracturing in either the short or long terms. A comprehensive analysis of the fracturing mechanism is critical for assessing the risks of potential slope failures, landslides and rock avalanches in seismic prone areas. This study employed 2D discrete element method (DEM) to investigate the fracturing of an intact rock slope of 600 m in base length and 300 m in
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Slope stability and post-failure analysis of soil-rock-mixture using the modified 2D DDA-SPH method Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-28 Changze Li, Guangqi Chen, Longxiao Guo, Jingyao Gao, Xinyan Peng, Pengcheng Yu
Soil-rock-mixture (SRM), consisting of high-strength rock blocks and low-strength soil, is widely distributed in nature. In traditional methods such as limit equilibrium methods, this geomaterial was simplified as a uniform medium without considering the influence of rocks due to its heterogeneity and complex physical and mechanical properties. A coupling method that bridges discontinuous deformation
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Effects of axial pre-force and loading rate on Mode I fracture behavior of granite Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-21 Zhenyu Han, Diyuan Li, Xibing Li
Coupled static-dynamic tests were carried out on notched semi-circular bend (NSCB) granitic specimens using a modified split Hopkinson pressure bar (SHPB) device, to investigate the effects of axial pre-force and loading rate on dynamic fracture behavior of rocks. Digital image correlation (DIC) method was adopted to obtain the deformation field and fracturing process. The results indicate that the
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Modelling the near-wellbore rock fracture tortuosity: Role of casing-cement-rock well system, perforation and in-situ stress Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-20 Xun Xi, Shangtong Yang, Zoe Shipton, Meifeng Cai
Near-wellbore rock fracture is a key subject in subsurface energy extraction. Casing perforation completion is perhaps the most used type of well design mainly in comparison to the open hole completion. However, the effects of the combined casing-cementing-rock structure on pressure transmission in fracturing the rock have not been sufficiently addressed, but is key to understanding some important
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Fracturing and AE characteristics of matrix-inclusion rock types under dynamic Brazilian testing Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-20 H.C. Wang, J. Zhao, J. Li, H.J. Wang, C.H. Braithwaite, Q.B. Zhang
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Effects of high-power microwave irradiation on tar-rich coal for realising in situ pyrolysis, fragmentation, and low-carbon utilisation of tar-rich coal Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-19 Yang Ju, Yan Zhu, Yuwei Zhang, Hongwei Zhou, Suping Peng, Shirong Ge
Tar-rich coal was directly combusted during power generation, resulting in a huge waste of precious oil resources and a large amount of carbon emissions. The idea of intelligent unmanned mining machine (IUMM) for in-situ fluidised mining and conversion of tar-rich coal was proposed to solve the problems of traditional mining and utilisation methods, realise efficient utilisation of tar-rich coal, and
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A new method to replicate high-porosity weak rocks subjected to cyclic freezing-thawing: Sand 3D printing and digital image correlation explorations Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-19 Ke Zhang, Na Li
Three-dimensional (3D) printing is an emerging technology capable of producing exact replica specimens in rock mechanics. In this work, the sand 3D printing was explored to model the influence of cyclic freezing and thawing (F-T) for high-porosity weak rocks, which is one of the serious threats to rock stability in a cold region. The evolution of pore structure in the printed specimen during the F-T
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Thermoacoustic emission characteristics and real-time damage evolution in shales of the Lower Palaeozoic Niutitang Formation Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-19 Zhenlong Ge, Qiang Sun, Qian Gao, Delu Li, Yuliang Zhang, Hao Huang
Identifying shale geological temperatures is important for understanding the thermal maturity, thermal evolutionary history, and hydrocarbon generation stages of shale formations, and enables efficient shale gas development. This paper investigates the thermal Kaiser effect of shales under different warming rates by studying the thermoacoustic emission (TAE) characteristics of shales in the Lower Palaeozoic
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Determining Young's modulus of granite using accurate grain-based modeling with microscale rock mechanical experiments Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-18 Xuhai Tang, Yiheng Zhang, Jingjing Xu, Jonny Rutqvist, Mengsu Hu, Zhengzhi Wang, Quansheng Liu
It is critical to rigorously determine the mechanical properties of granitic rocks to effectively analyze and manage subsurface engineering activities, such as geothermal energy exploitation and nuclear waste disposal. However, the required deep drilling and sampling for macroscale rock mechanics experiments (macro-RME) are challenging and expensive. In this study, we developed a novel accurate grain-based
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A method for full three-dimensional kinematic analysis of steep rock walls based on high-resolution point cloud data Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-18 Giovanni Gigli, Luca Lombardi, Tommaso Carlà, Tommaso Beni, Nicola Casagli
The predisposition of a slope to generate rockfalls is related to the intensity of rock mass jointing and the geometric arrangement of discontinuities intersecting the rock face. With the increasing use of terrestrial laser scanner (TLS) in rock slope surveying, methods have been proposed to semi-automatically extract the spatial properties of outcropping discontinuities from high-resolution topographic
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Experimental study on the effective stress law and permeability of damaged sandstone under true triaxial stress Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-17 Beichen Yu, Dongming Zhang, Bin Xu, Minghui Li, Chao Liu, Weijing Xiao
The effective stress law and the permeability play a notable role in dealing with the gas-solid coupling problem of porous media. The key parameter to quantify the influence of pore pressure to effective stress is the effective stress coefficient αij. However, current relevant researches are mainly focused on the pore elastic flow characteristics in the elastic stage or hydrostatic pressure under conventional
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Grain-scale analysis of fracture paths from high-cycle hydraulic fatigue experiments in granites and sandstone Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-16 Li Zhuang, Arno Zang, Sunggyu Jung
Previous studies have revealed that hydraulic fracturing behavior in crystalline rock (e.g., granite) is highly dependent on mineral content, grain size, and heterogeneity and is therefore quite different from the behavior observed in sedimentary rock (e.g., sandstone). We investigated hydraulic fracture paths generated via cyclic and monotonic injection in Pocheon granite, Gonghe granite, and gray
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Investigation of geological conditions beyond the excavation face using a MSP boring data monitoring system Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-11 Min-Seong Kim, Sean Seungwon Lee
Pre-investigation of geological conditions beyond the excavation face is crucial for assessment of safety and design in underground construction. This study developed a boring data monitoring system equipped for a multi-setting smart-investigation of the ground and pre-large hole boring (MSP) machine that typically drills a horizontal distance of 50 m to reduce blast-induced vibration. The monitoring
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Editorial Board Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-11
Abstract not available
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Numerical modelling of rock mass bulking and geometric dilation using a bonded block modelling approach to assist in support design for deep mining pillars Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-07-06 Thierry Lavoie, Erik Eberhardt, Matthew E. Pierce
As underground mining operations move deeper and the stresses encountered become more adverse, mine pillars are experiencing increased stress-induced damage and rock mass bulking. This has led to significant challenges in designing effective support systems, leading to costly mine development, production delays and support maintenance and rehabilitation requirements. Efforts to assess rock mass bulking
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Reconstruction of rough rock joints: 2D profiles and 3D surfaces Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-06-20 Xige Liu, Wancheng Zhu, Yangxiao Liu, Kai Guan
The 3D reconstruction of rock joint surfaces is crucial for quantifying rock joints. Through the uniform discretization of 2D and 3D rock joints, it was determined that both the climbing angles along the shear direction and the projection lengths of the consecutive ascending/descending segments follow normal distributions. This statistical distribution of climbing angles and projection lengths provides
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An elastoplastic damage constitutive model for rock-like materials with a fractional plastic flow rule Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-06-08 W.Q. Shen, S.Y. Liu, W.Y. Xu, J.F. Shao
An elastoplastic damage constitutive model is constructed in this work to describe the macroscopic mechanical behaviors of geomaterials with a “porous matrix - inclusion” microstructure. In order to consider the influences of microstructure on its nonlinear behavior, such as the porosity, volume fraction of inclusions and the properties of the solid phase, the macroscopic yield criterion derived in
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Numerical study of time-dependent deformation and cracking in brittle rocks with phase-field method and application to slope instability analysis Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-06-03 Meng Wang, Zhan Yu, Wanqing Shen, Jianfu Shao
Most rocks exhibit time-dependent deformation and failure. Two main mechanisms are generally considered, the progressive growth of cracks and viscoelastic and/or viscoplastic deformation. In this study, cracking process is described by a viscous phase-field method which is coupled with a viscoplastic model. The evolution of crack field is controlled by both elastic and viscoplastic tensile volumetric
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An experimental study of the contact mechanical behaviour of marble spheres under cyclic loading Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-28 Yang Ye, Yawu Zeng, Hanqing Sun, Wenjun Ma, Xi Chen, Zhixiong Peng
A series of cyclic compression tests of marble spheres and scanning electron microscopy (SEM) imaging measurements were performed in this work. The cyclic compression tests of marble spheres reveal three different fracture types: Hertzian cracks, oblique fractures and multi-meridian fractures. The displacement of marble spheres with Hertzian cracks or oblique fractures in cyclic compression tests can
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Fractal characteristics of fractures in crystalline basement rocks: Insights from depth-dependent correlation analyses to 5 km depth Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-27 Mohammad Javad Afshari Moein, Keith F. Evans, Benoît Valley, Kristian Bär, Albert Genter
The scaling laws describing the spatial arrangement of fractures along six deep boreholes penetrating the crystalline rocks in the Rhine Graben were derived using a correlation analysis. Five of the wells, two to 5 km depth, were located at the Soultz geothermal site and one well to 5 km depth was located at Basel, some 150 km from Soultz. Five datasets were derived from borehole imaging logs, whilst
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Effective stress effect and slippage effect of gas migration in deep coal reservoirs Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-27 Chao Liu, Beichen Yu, Honggang Zhao, Zequn Hong, Zhuangcai Tian, Dongming Zhang, Yixin Liu
The deep coal reservoir is in a high in-situ stress regime, and the drop in pore pressure during the coalbed methane extraction can induce significant slippage effect and effective stress change. Both of them play a competitive role in permeability evolution. In our research, coal seepage experiments under variable bulk stress and pore pressure paths are performed to investigate the slippage effect
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Fracture mechanism and energy evolution of sandstone with a circular inclusion Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-26 Quanqi Zhu, Chongjin Li, Xibing Li, Diyuan Li, Weihua Wang, Jiangzhan Chen
Understanding the stress distribution, deformation and fracture behavior around a circular hole or inclusion is critical for the stability assessment of rock structures such as tunnels and backfilled openings. In this study, the analytical solutions of stress and displacement distribution around a circular inclusion of different elastic properties were first derived based on the theory of elasticity
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Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-21 Nomqhele Z. Nkosi, Musa S.D. Manzi, Michael Westgate, Dave Roberts, Raymond J. Durrheim, Hiroshi Ogasawara, Martin Ziegler, Michael Rickenbacher, Bennie Liebenberg, Tullis C. Onstott
Petrophysical properties of cylindrical core specimens from three boreholes from the International Continental Scientific Drilling Program, the DSeis project, measured at ambient pressure and room temperature conditions in various laboratories are presented and compared with downhole petrophysical data (sonic and density). The measured properties are from sixty-six rock specimens constituting metasediments
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Can DAS be used to monitor mining induced seismicity? Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-19 Hendrik J. du Toit, Gareth Goldswain, Gerrit Olivier
Distributed acoustic sensing (DAS) is being applied in an increasing number of geoscientific fields. We present herein preliminary results of applying DAS to monitor microseismicity in underground mines. We installed 275 m of fiber optic cable approximately 1500 m below the surface in an operational mine and recorded mine seismicity for two weeks during November of 2018. The first approximately 50 m
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Efficient implicit methods for wellbore shear failure analysis during drilling and production in coalbeds Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-14 Ruizhi Zhong, Travis Mitchell, Raymond Johnson, Christopher Leonardi
Wellbore instability is an important consideration during both drilling and production of hydrocarbon reservoirs. The optimal well trajectory must be determined during the design phase to avoid wellbore shear failures. This study makes two fundamental contributions towards improving contemporary wellbore shear models. For the first time, the analytical wellbore shear models are formulated implicitly
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Effects of chemical osmosis on swelling clays and the elastic properties of the Pierre shale with its implications for oil recovery Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-11 Olawale O. Adekunle, Binh T. Bui, Daisuke Katsuki
The main objective in this study is to experimentally investigate how two types of shales different in swelling characteristic and organic carbon content behave in terms of the mechanical and infiltration properties when being subjected to changing osmosis with varying brine salinity under in-situ stress conditions. This research also aims to determine the swelling tendency of thePierre shale and replicate
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Editorial Board Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-09
Abstract not available
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Mechanical response and strain localization in coal under uniaxial loading, using digital volume correlation on X-ray tomography images Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-05-04 Vikram Vishal, Debanjan Chandra
A comprehensive analysis of crack initiation and propagation in coal is critical for understanding its mechanical behavior and its impact on permeability. The finite element-based digital volume correlation (DVC) of time-resolved X-ray tomography images under cleat-parallel uniaxial compression provides 3D incremental strain fields to understand the evolution and propagation of cracks. In this study
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A novel method to determine five elastic constants of a transversely isotropic rock using a single-orientation core by strip load test and strain inversion Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-27 Juhyi Yim, Seungki Hong, Yoonsung Lee, Ki-Bok Min
This study proposes a novel method to determine the five elastic constants from a single-orientation core of a transversely isotropic rock using strip loading and strain inversion. The proposed method can be performed under two test conditions: 1) strip load test and strain inversion (single strip load method) and 2) strip load test combined with Brazilian test and strain inversion (strip load and
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Investigation of the spatial distribution pattern of 3D microcracks in single-cracked breakage Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-25 Chunlai Wang, Yubo Liu, Xiaolin Hou, Davide Elmo
The implementation of multi-crack recognition requires a theoretical basis from single-crack failure results. This study investigates the spatial distribution pattern of microcracks in single-crack-damaged coal specimens subjected to uniaxial compression. The distribution mechanism of the induced microcracks is analysed in terms of macrocracks and stress states. Gaussian and Weibull distributions are
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Stress modelling using cellular automata for block caving applications Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-25 René Gómez, Raúl Castro
In underground mining, rock mass stress is commonly modeled as a continuum. However, in block cave mining discrete modelling should be used to properly represent the stress over the extraction level in the broken column where there are high rock columns of large rock fragments. Unfortunately, we lack methods that use discrete modelling of stress in the broken column at block caving scale. In this work
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Numerical investigation of sand production mechanisms in weak sandstone formations with various reservoir fluids Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-23 Furkhat Khamitov, Nguyen Hop Minh, Yong Zhao
A three-dimensional CFD-DEM simulation method was developed to investigate the influence of different reservoir fluids on sand production. The fluid properties and reservoirs were prescribed and modelled after the conditions in the Kenkiyak and Uzen oil fields in Kazakhstan. A cylindrical sandstone sample was modelled using the Discrete Element Method in three stages of the pluviation, diagenesis,
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The propagation and interaction of cracks under freeze-thaw cycling in rock-like material Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-21 Xuhai Tang, Siji Tao, Ping Li, Jonny Rutqvist, Mengsu Hu, Lei Sun
In cold mountainous regions, the freeze-thaw cycling often leads to rock weathering, which might trigger spalling, significant landslides and rockfalls. In this work, we used combined experimental, theoretical and numerical approaches to investigate the mechanisms of frost cracking as a result of coupled effects of freeze-thaw cycling, confining stress and the interaction of multiple cracks. The experimental
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DECOVALEX-2019: An international collaboration for advancing the understanding and modeling of coupled thermo-hydro-mechanical-chemical (THMC) processes in geological systems Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-22 Jens T. Birkholzer, Alexander E. Bond
The DECOVALEX Project is an international research collaboration for advancing the understanding and modeling of coupled thermo-hydro-mechanical-chemical (THMC) processes in geological systems. DECOVALEX stands for “DEvelopment of COupled Models and VALidation against EXperiments”. The creation of this international initiative, now running for almost 30 years, was motivated by the recognition that
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Dynamic viscoelastic model for rock joints under compressive loading Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-20 Yatao Yan, Jianchun Li, Xing Li
The mechanical properties of rock masses are significantly affected by the deformated behaviors of discontinuities, such as joints and faults. Rock masses in nature are also often subjected to dynamic disturbances, including explosive and seismic loads. Therefore, it is crucial to understand the deformed response of rock joints under dynamic loads. In this study, a series of dynamic compression expriments
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Numerical electric breakdown model of heterogeneous granite for electro-pulse-boring Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-20 Xiaohua Zhu, Yunxu Luo, Weiji Liu, Hai Hu, Mengqiu Chen
The problems of cost, environmental protection and efficiency of hard rock fragmentation in petroleum exploration, drilling and other projects need to be solved urgently. Electro-pulse-boring (EPB) technology has attracted attention due to its advantages of low rock breaking energy consumption, low wear and low time cost. However, there is still no more accurate description model for EPB and rock fragmentation
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Effects of the gradient distribution of microdefects on wave propagation through a rock mass Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-19 M. Wang, L.F. Fan, X.L. Du
This paper investigates the effects of the gradient distribution of microdefects on wave propagation through a rock mass. A piecewise three-characteristic lines method is proposed that can consider the gradient distribution of microdefects. A rock mass with a microdefect gradient distribution was explored and compared to wave propagation through a rock mass with a uniform distribution of microdefects
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A study on the energy sources and the role of the surrounding rock mass in strain burst Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-14 Charlie C. Li, Tongbin Zhao, Yubao Zhang, Wenkai Wan
Strain burst occurs within highly stressed hard rocks in underground excavations. A prerequisite for strain bursting is that excess energy exists to eject material after rock failure. Both the bursting rock and the surrounding rock mass will contribute to the excess energy. However, the proportion of the energy contributed from each is currently not well understood. This issue will be quantitatively
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Experimental investigation of failure process and characteristics in circular tunnels under different stress states and internal unloading conditions Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-14 Xuefeng Si, Xibing Li, Fengqiang Gong, Linqi Huang, Xiling Liu
In this study, we investigated the failure process and evolution mechanisms in circular tunnels under a complex stress path of deep in-situ stress + excavation unloading + stress adjustment using a simulation test based on loading first and then drilling (LFTD) mode. This test was performed on cubic sandstone specimens using a true-triaxial testing system combined with a self-developed drilling unloading
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A breakage–damage framework for porous granular rocks in surface-reactive environments Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-11 Xianda Shen, Giuseppe Buscarnera
High-porosity granular rocks are moisture-sensitive solids, in that their strength and deformability are modulated by the relative humidity of their environment. Here, a novel continuum breakage–damage framework is developed to characterize and simulate the inelasticity of cemented granular materials subjected to changes of relative humidity. A microstructural model is proposed to describe the evolution
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Peridynamics and surrogate modeling of pressure-driven well stimulation Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-08 D. Thomas Seidl, Dakshina M. Valiveti
In this work we use the peridynamics theory of solid mechanics to simulate fracture in an annular rock domain subject to an in-situ stress and create surrogate models that predict the area of the resulting cracks. Peridynamics is a non-local formulation of continuum mechanics that naturally accommodates material discontinuities. Furthermore, unlike other fracture modeling techniques there is no need
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Behavior in mixed-mode of desiccation cracks on a clayey rock front gallery Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-06 Stephen Hedan, Valéry Valle, Richard Giot, Philippe Cosenza
This study reports on the mixed-mode behavior of desiccation cracks in a clayey rock front gallery. As most digital image correlation (DIC) algorithms have access to the full-field measurements of the displacements and strains, the improvements in DIC now allow the automatic detection of the jumps in the displacements induced by the opening and sliding of desiccation cracks without imposed initial
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A true triaxial experimental study on porous Vosges sandstone: from strain localization precursors to failure using full-field measurements Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-05 Cyrille Couture, Pierre Bésuelle
This study systematically investigates the effect of deviatoric loading paths on diffuse and localized deformation developing during the mechanical loading of a high porosity (20%) Vosges sandstone (Eastern France). Laboratory scale experiments are performed using a high pressure true triaxial apparatus, designed to provide access to full-field surface kinematics at high spatial and temporal resolutions
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Modelling anisotropic adsorption-induced coal swelling and stress-dependent anisotropic permeability Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-02 Min Chen, Shakil Masum, Sivachidambaram Sadasivam, Hywel Thomas
To investigate the anisotropy of coal swelling, this study proposes an effective stress model for saturated, adsorptive fractured porous media by considering gas adsorption induced surface stress change on solid-fluid interface. The effective stress model can be used to capture the anisotropic swelling of coal combining anisotropic mechanical properties and to link with the anisotropic permeability
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Modeling the shearing behavior of discontinuous rock mass incorporating dilation of joint aperture Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-02 Jintong Zhang, Mamoru Kikumoto, Hideaki Yasuhara, Sho Ogata, Kiyoshi Kishida
The shearing characteristics of rock joints govern the mechanical performance of discontinuous rock masses. The present study investigated the normal compression and shear behavior of rock joints through cyclic compression tests and direct shear tests. The irreversible relationship between the normal stress and the normal closure was confirmed by cyclic compression tests on rock joints. An elastoplastic
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Theoretical analysis of the triggering condition of class-II rock behaviors Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-02 Qi-Zhi Zhu, Qiao-Juan Yu
Mechanical response with a snapback (class-II behavior) is one of the basic features of brittle rocks. This technical Note presents analytical studies on the critical condition which separates the class-I and class-II rock behaviors. Formulations under conventional triaxial compression are performed by making direct use of the closed-form solutions of the damage-friction coupling constitutive equations
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A three-phase coupled numerical model for the hydraulic fracturing of rock Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-01 Qin Li,Jijian Lian,Gao-feng Zhao
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Ground surface uplift during hardcoal longwall mining Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-04-01 Eva Jirankova, Petr Konicek
Ground surface uplift was detected during longwall mining in the Lazy Mine, a hard coal mine in the Czech part of the Upper Silesian Coal Basin, Czech Republic. The greatest uplift was 218 mm, based on surface point levelling by comparing surface points with heights of non-mined areas. This uplift occurred during subcritical mining at an average depth of 740 m below the surface. The mined coal seam
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Poroelastic effects on gas transport mechanisms and influence on apparent permeability in shale Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-03-31 Mohammad Hatami, David Bayless, Alireza Sarvestani
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Experimental investigations of static mechanical properties and failure characteristics of damaged diorite after dynamic triaxial compression Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-03-29 Quanqi Zhu, Xibing Li, Diyuan Li, Chunde Ma
To investigate the static mechanical properties and failure characteristics of damaged rocks after impact under realistic in-situ stress, dynamic triaxial compression tests with different strain rates and confining pressures were conducted on diorite by a modified split Hopkinson pressure bar. The damage factor was calculated according to the change of the longitudinal wave velocity of rocks before
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Induced and triggered seismicity by immediate stress transfer and delayed fluid migration in a fractured geothermal reservoir at Pohang, South Korea Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-03-28 Kwang-Il Kim, Hwajung Yoo, Sehyeok Park, Juhyi Yim, Linmao Xie, Ki-Bok Min, Jonny Rutqvist
This study reveals the important role of hydromechanical responses of large hydraulic fractures in the cause and mechanisms of induced seismicity associated with the Mw 5.5 earthquake at the Pohang geothermal site, South Korea. Fractures intersecting two stimulation wells, PX-1 and PX-2, were identified through a comprehensive analysis of various data produced from drilling and hydraulic stimulations
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Salt-induced structure damage and permeability enhancement of Three Gorges Reservoir sandstone under wetting-drying cycles Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-03-28 Xihui Jiang, Changdong Li, Jia-Qing Zhou, Zihan Zhang, Wenmin Yao, Wenqiang Chen, Hong-Bin Liu
The salts contained in water can gradually accumulate in pore networks of rocks under wetting-drying cycles, which could cause rock deterioration. The salt-induced damage under this cyclic process can result in dynamically evolving mechanical and hydraulic properties of the rock, which is relevant to many rock-related engineering activities and geological hazards. In this study, the structure damage
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Frictional properties of the rupture surface of a carbonate rock avalanche Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-03-19 Ming Zhang, Long Yang, Weichao Li, Zhengbo Wang, Chenyang Zhang, Qian Chen, Bo Wang
To investigate frictional properties of the rupture surface of the carbonate Jiweishan rock avalanche, we conducted high-velocity-friction tests on the limestone and shale samples at different shear rates. The samples showed shear- and rate-strengthening of friction at low shear rates, but transformed to shear- and rate-weakening of friction at large shear rates. The critical shear rate was deduced
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Seismic hazard calculation using the equivalent magnitude obtained from numerical modelling Int. J. Rock Mech. Min. Sci. (IF 6.849) Pub Date : 2022-03-18 Juan Andres Jarufe Troncoso, Sebastian Perez, Juan Pablo Hurtado, Carlos Cifuentes
Numerical modelling is widely used to estimate seismic potential in mines. Several numerical methods, along with different interpretation techniques, allow estimating the seismic potential at different stages of a mine or tunnel construction. However, none of the existing methods considers the magnitude of seismic events as a distribution of values, rather all methods focus on obtaining a single value