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Characteristics of strata movement and method for runoff disaster management for shallow multiseam mining in gully regions: A case study Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-11-30 Yilong Liu, Tianhong Yang, Yong Zhao, Kai Ma, Xiangang Hou, Qianbai Zhao, Jinduo Li
Multiseam mining in gully regions has resulted in severe and complex disaster chains, including crack development, mountain landslides, river blockage, and intensified mine water inflow. To prevent and control water inrush disasters, it is imperative to investigate the characteristics and mechanizations of overburden failure under the combined effect of gully terrain and repeated mining in coal seams
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Characteristics of carbon dioxide fracturing in comparison to conventional water hydraulic fracturing: Evidence from acoustic emission monitoring of small-scale field experiments Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-11-27 Tsuyoshi Ishida, Yoshinobu Kishimoto, Shuich Desaki, Makoto Naoi, Kenichiro Suzuki, Hirokazu Fujii
We conducted small-scale field hydraulic fracturing (HF) experiments using carbon dioxide (CO2) and water as fracturing fluids. A hole was drilled 10–14 m below the tunnel floor into hot granitic rock whose temperature can form CO2 supercritical state at HF pressure. Under the same injection rate of 10 mL/min, the volume of the acoustic emission (AE) hypocenter distribution induced by CO2 HF was approximately
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A conceptual three-dimensional frictional model to predict the effect of the intermediate principal stress based on the Mohr-Coulomb and Hoek-Brown failure criteria Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-11-28 Adam K. Schwartzkopff, Atsushi Sainoki, Thomas Bruning, Murat Karakus
The intermediate effective principal stress has a considerable influence on rock strength as shown by true-triaxial data on intact rock. Therefore, a failure criterion that incorporates all three principal stresses may provide an improved prediction of failure than one that considers only the major and minor effective principal stresses. This study introduces a generalisation method, which converts
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A new Hoek-Brown-Matsuoka-Nakai failure criterion for rocks Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-11-17 M. Vicente da Silva, A.N. Antão
In the current paper, we propose a new three-dimensional strength criterion for rocks expressed in terms of the first principal stress invariant, I1, and the second and third invariants of the deviatoric stress tensor, J2 and J3. The design of this constitutive model conjugates the characteristics of two of the most well-known and widely used criteria in geotechnical engineering: Hoek-Brown and Matsuoka-Nakai
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Particle detachment in reservoir flows by breakage due to induced stresses and drag Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-10-23 Abolfazl Hashemi, Sara Borazjani, Cuong Nguyen, Grace Loi, Nastaran Khazali, Alex Badalyan, Yutong Yang, Bryant Dang-Le, Thomas Russell, Pavel Bedrikovetsky
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A local surface roughness mapping method for post-failure interpretation of brittle fracture propagation Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-10-11 Earl Magsipoc, Giovanni Grasselli
Tensile fractures in brittle materials may exhibit striation features running along the surface that indicate the trajectory of fracture propagation. Because of the directional persistence of these features, directional roughness characterization methods can be used on subsampled fracture surface data to map localized roughness features that follow these striations. These maps can aid in the interpretation
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Tensile strength degradations of mineral grain interfaces (MGIs) of granite after thermo-hydro-mechanical (THM) treatment Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-10-09 Mengyi Li, Zhijun Wu, Lei Weng, You Wu, Zhiyang Wang, Quansheng Liu
Granite for hosting the deep geological repository (DGR) is subjected to thermo-hydro-mechanical (THM) treatment for decades of years, while the variations in the tensile strengths of mineral grain interfaces (MGIs) with THM treatment are still unknown. Served as an important parameter in determining the macro mechanical properties of granite, quantifying the tensile strength degradation of MGI with
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Distributed strain monitoring of overburden delamination propagation at a deep longwall mine Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-22 Jianlin Xie, Qingdong Qu, Weibing Zhu, Xiaozhen Wang, Jialin Xu, Shan Ning, Tao Hou, Xun Luo
Clear understanding of overburden failure propagation during underground mining is critical in managing safety and environmental issues such as rock burst hazards, groundwater inrush and longwall convergency. This paper presents an in-situ monitoring study of overburden strain dynamics at a kilometre-deep longwall mine using distributed fibre optic sensing technology (DFOS). A deep borehole was drilled
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Model tests on dynamic responses of surrounding rock and support structure on underground tunnel under combined dynamic and static loading Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-21 Q.R. Wang, L.X. Xie, E.X. Song, F.L. Kong, J.Q. Fan, L.Y. Yu, J.M. Xu, X.Y. Shi
The effect of blasting vibration on the macroscopic failure characteristics of underground tunnels has been investigated, but little attention has been paid to the stress and deformation characteristics of underground tunnels under the combined action of explosion waves and in-situ stresses. Consequently, enhancing the bearing capacity of surrounding rock masses by adopting effective reinforcement
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3D spatial fracture behavior of sandstone containing a surface flaw under uniaxial compression Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-21 Zhenyu Han, Jianchun Li, Diyuan Li, Jian Zhao
Surface defects are prevalent in natural rock masses, and the newborn cracks that initiate from these defects and significantly affect structural stability usually extend in a three-dimensional (3D) manner. Hence, in this research, a series of uniaxial compression tests were conducted on sandstone specimens containing a surface flaw to examine the effect of nondimensional flaw depth (0, 0.3, 0.5 and
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Modelling the loosening of rock in the experimental rock mining method Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-21 Zbigniew Szkudlarek, Stanisław Szweda
Analytical description of the process of rock discontinuity caused by the operation of an experimental cutting head, in which a combination of cutting and loosening methods was used, is presented. Loosening of the rock fragment takes place after reaching the tensile or shear strength of the rock, what is more favourable compared to the classical mining methods. An analytical model of the stress in
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Strain rockburst failure characteristics and mechanism of high stress circular hard rock tunnel triggered by dynamic impact load Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-20 Wuxing Wu, Fengqiang Gong, Li Ren, Lei He
Strain rockburst poses a great threat to the construction safety of deep engineering, especially induced by dynamic impact loads such as blasting from the adjacent tunnel excavation. Aiming to clarify the failure characteristics and mechanism of strain rockburst induced by the dynamic impact load, a series of dynamic impact tests under different biaxial prestress conditions were conducted on the sandstone
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Constitutive modeling of clay shales in undrained conditions and its experimental verification for Opalinus Clay Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-18 Kavan Khaledi, Lisa Winhausen, Mohammadreza Jalali, Florian Amann
Clay shales are low-permeable sedimentary rocks that exhibit inherent cross-anisotropic stiffness, strength, and permeability. Accurate design of tunnels excavated in clay shales requires appropriate constitutive models that account for the anisotropic properties of the host rock, especially under undrained conditions. This paper presents a transversely isotropic elastoplastic-damage model for fully-saturated
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Heterogeneity indexes of unconventional reservoir shales: Quantitatively characterizing mechanical properties and failure behaviors Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-12 Dingdian Yan, Luanxiao Zhao, Yang Wang, Yonghao Zhang, Zhenjia Cai, Xuehang Song, Fengshou Zhang, Jianhua Geng
Heterogeneity is an inherent feature of subsurface rocks. Unconventional reservoir shales, a group of typically fined-grained sedimentary rocks, usually exhibit strong heterogeneities due to the diversity of their constituents, including stiff silicate and carbonate minerals, ductile clay minerals, and organic matter. Understanding the influence of heterogeneities on the mechanical response as well
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Laboratory investigation of scale effects in bursting failure of quasi-brittle materials Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-16 Fuqiang Gao, Xiangyuan Peng, Guiyang Yuan, Wenju Liu
Understanding the scale effect in the behavior of solid materials is important when small-scale models are used to predict the behavior of real structures. Tremendous efforts have been devoted to investigating the scale effect in the strength of quasi-brittle materials. However, limited studies have focused on the whether there is a scale effect in bursting failure, which is a typical failure pattern
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Attenuation characteristics of shock waves in drilling and blasting based on viscoelastic wave theory Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-15 Zhiwei Ye, Jianhua Yang, Chi Yao, Xiaobo Zhang, Shuihua Jiang, Chuangbing Zhou
This study investigates the propagation and attenuation characteristics of shock waves produced by drilling and blasting. The focus is on a novel method for calculating the attenuation of the shock wave pressure. Based on the propagation of shock waves in a rod with a variable section and a Maxwell model for rock, theoretical solutions for the attenuation of the blast-induced shock wave pressure were
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Permeability evolution and production characteristics of inclined coalbed methane reservoirs on the southern margin of the Junggar Basin, Xinjiang, China Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-14 Shun Liang, Yaowu Liang, Derek Elsworth, Qiangling Yao, Xuehai Fu, Junqiang Kang, Yisong Hao, Meng Wang
The thick and steeply inclined coal seams of the Junggar Basin of Xinjiang, China, are unique with dip angles generally >50° but over the range 0°–85°. Initial and evolving permeability and pressures change drastically around wells down-dip within the steeply inclined reservoir as a result of the depth differential. Hence, the evolution of permeability and fluid pressures during drainage exhibits significant
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Recognition of shear and tension signals based on acoustic emission parameters and waveform using machine learning methods Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-11 Fuqiang Ren, Chun Zhu, Zhaohu Yuan, Murat Karakus, Shibin Tang, Manchao He
Acoustic emission (AE) technology is widely used to monitor the damage evolution of rock. Identifying AE signals is crucial to reveal the rock cracking mechanism. The current tension and shear signal discrimination methods primarily rely on AE parameters. However, the differences between AE parameters and waveform images used as inputs require further exploration. Acoustic emission data from Brazilian
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Bi-modular properties of sandstone inferred from seismic moment tensors of acoustic emissions Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-14 Václav Vavryčuk, Matěj Petružálek, Tomáš Lokajíček, Ali Aminzadeh
We propose a novel method for studying the λ/μ ratio, the vP/vS ratio and Poisson's ratio of rocks based on the determination of highly accurate moment tensors of acoustic emissions (AEs). The validity of the method is verified on observations of 539 AEs recorded in a sandstone sample during a semi-circular bend test. We show that the sandstone exhibits the so-called bi-modular behaviour indicating
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Size effect and lateral pressure effect on the mechanical resistance of columnar jointed basalt Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-15 Yong-yi Wang, Bin Gong, Chun-an Tang, Xiao-yu Yang
To reveal the size effect and lateral pressure effect of columnar jointed basalts (CJBs), the meso-damage mechanics, statistical strength theory, continuum mechanics and digital image correlation are combined, and a series of heterogeneous numerical models of CJBs orthogonal and parallel to column axis are established. The elastic modulus, Poisson's ratio, uniaxial compressive strength, friction angle
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Numerical investigation of borehole breakout and rock spalling based on strain energy criteria Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-15 Zizhuo Xiang, Taehyun Moon, Joung Oh, Xu Li, Guangyao Si, Ismet Canbulat
Borehole breakout is a natural phenomenon resulting from in-situ stress redistribution around a borehole, and its orientation and geometries are critical indicators for in-situ stress direction and magnitudes. The aim of the study is to better understand the borehole breakout formation mechanism and reproduce breakout geometries using numerical simulations. A 2D bonded-particle model (BPM) is developed
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A comparison study on the predictive ability of numerical methods for fracturing of rock with different pre-existing flaws Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-12 Yimin Hao, Xindong Wei, Gao-Feng Zhao
Various numerical methods have been developed for modelling rock fracturing problems. Most of the available studies could reproduce reasonable results for given experimental data, but the ability and accuracy of these methods to predict rock fracturing are still controversial, and a systematic comparison is lacking. In this study, a set of rock mechanics experiments were designed for a numerical modelling
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Characteristics and mechanism of rockburst at five deep gold mines in Jiaodong Peninsula of China Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-09 Peng Xiao, Diyuan Li, Guoyan Zhao, Quanqi Zhu
Rockburst in deep rock engineering poses serious threat to personnel safety and engineering. In order to reveal the rockburst characteristics in deep engineering, the rockburst investigations and rockburst mechanisms based on in-situ stress were carried out at five deep gold mines in Jiaodong Peninsula, China. At the cover depth between 400 m and 600 m, the ground pressure hazards are mainly local
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Upscaling the creep behavior of clay-rich and quartz-rich shales from nanoindentation measurements: Application to the Wufeng-Longmaxi shale, China Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-09 Jianfeng Wang, Yuke Liu, Chao Yang, Yangcheng Zheng, Wenmin Jiang, Luca Menegon, François Renard, Ping'an Peng, Yongqiang Xiong
Creep of shale controls the stability of fault gouge in sedimentary rocks, aseismic deformation in the upper crust, and several engineering operations, such as proppant embedment, reservoir subsidence, and wellbore stability during unconventional shale gas exploitation. However, measuring the creep properties of shale is challenging due to the multi-scale structure of this rock. Here, our goal is to
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Development of gravity flow draw theory and determination of its parameters Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-09 Huan Liu, Rongxing He, Guanghui Li, Dongdong Sun, Peng Li
The caving mining method relies on gravity to transport large amounts of caved ore and rock, therefore, the gravity flow rules are the foundation for determining or optimizing the stope parameters. The stochastic medium draw theory of gravity flow is relatively fast and easy to implement, and it can describe different shapes of the drawbody. However, the theory usually regards the drawpoint as a point
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Analysis of thermo-mechanical damage around tunnel and deposition boreholes of an underground nuclear waste disposal facility at the Forsmark site (Sweden) by 3D coupled FDEM simulations Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-09-09 Andrea Lisjak, Omid Mahabadi, Johnson Ha, Diego Mas Ivars
This study focuses on rock damage potentially developing in the near-field of a planned underground nuclear waste repository at the Forsmark site (Sweden). In hard, crystalline rocks, mechanical damage in the form of spalling may be induced during construction by overstressing of the excavation periphery. During operation, thermal damage may develop due to additional thermo-elastic stresses forming
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Non-isothermal consolidation: A systematic evaluation of two implementations based on multiphase and Richards equations Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-08-04 Michael Pitz, Sonja Kaiser, Norbert Grunwald, Vinay Kumar, Jörg Buchwald, Wenqing Wang, Dmitri Naumov, Aqeel Afzal Chaudhry, Jobst Maßmann, Jan Thiedau, Olaf Kolditz, Thomas Nagel
In this paper, the governing equations of non-isothermal two-phase flow in unsaturated, deformable porous media are presented based on different representations of the gaseous phase along with their implementations in the open-source FEM code OpenGeoSys 6. As one implementation utilises the Richards equation to represent the unsaturated system whereas the second implementation relies on a two-component
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Immiscible imbibition in fractured media: A dual-porosity microfluidics study Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-30 Alejandro Cardona, J. Carlos Santamarina
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Experimental and numerical investigation on the peak value and loading rate of borehole wall pressure in decoupled charge blasting Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-28 Xiaofeng Huo, Xianyang Qiu, Xiuzhi Shi, Hui Chen, Yonggang Gou, Zhi Yu
Decoupled charge structures are widely used in contour blasting because of their lower peak value and loading rate of the borehole wall pressure (BWP), which plays an important role in the contour blasting effect. The filling medium and decoupling ratio are the two key factors of decoupled charge blasting, and their effects on the peak value, rise time and loading rate of BWP need to be investigated
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Coupled meshfree (SPH) and grid based (FDM) procedures for modeling fluid flow through deformable porous media Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-29 Kumar Shwetank, Debasis Deb, Ranjan Pramanik
A coupled numerical framework based on smoothed particle hydrodynamics (SPH) and finite difference method (FDM) has been developed to analyze the coupled process of fluid flow in a deformable poro-elastic medium. The salient feature of the developed coupled model is that the porous media has been simulated by two separate layers to describe solid and fluid phase with their respective governing equations
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Comparison of contact treatment methods for rigid polyhedral discrete element models Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-27 Ákos Orosz, Katalin Bagi
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Experimental study on brittle-to-ductile transition mechanism of lower Silurian organic-rich shale in south China Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-27 Guoxi Cheng, Bo Jiang, Fengli Li, Ming Li, Yu Song, Chenliang Hou
Brittle-ductile transition conditions and mechanisms are key scientific issues embedded in the reservoir deformation-related difficulties faced during shale gas exploration and exploitation. In this study, shale deformation experiments under different temperatures, confining pressure and differential stress were conducted using a NaCl solid confining pressure medium, taking the Lower Silurian marine
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Rockfall in open pit mines: management of the pit geometry and protection measures design Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-28 Maddalena Marchelli, Daniele Peila, Anna Giacomini
Rockfall events represent a serious hazard for people, structures, and infrastructures. The phenomenon can occur in several environments, natural and artificial. In surface mining operations, blasting, bench clean-up and scaling can induce rock blocks detachment, compromising operators’ and operations’ safety. The installation of passive mitigation measures coupled with a specific design of the pit
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Comparative verification of hydro-mechanical fracture behavior: Task G of international research project DECOVALEX–2023 Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-28 Mostafa Mollaali, Olaf Kolditz, Mengsu Hu, Chan–Hee Park, Jung–Wook Park, Christopher Ian McDermott, Neil Chittenden, Alexander Bond, Jeoung Seok Yoon, Jian Zhou, Peng–Zhi Pan, Hejuan Liu, Wenbo Hou, Hongwu Lei, Liwei Zhang, Thomas Nagel, Markus Barsch, Wenqing Wang, Son Nguyen, Saeha Kwon, Keita Yoshioka
Numerical simulations become a necessity when experimental approaches cannot cover the required physical and time scale of interest. One of such area is a simulation of long-term host rock behaviors for nuclear waste disposal and simulation tools involved in the assessment must go through rigorous validation tests. The DECOVALEX project (Development of COupled models and their VAlidation against EXperiments)
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Excavation Damage Zone fracture modelling for seismic tomography: A comparison of explicit fractures and effective medium approaches Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-28 Emmanouil Parastatidis, Mark W. Hildyard, Andy Nowacki, William J. Flynn, Johannes Suikkanen
We model the full wavefield produced by a seismic velocity survey and optimise the representation of the fracture zone to best match field waveforms. The velocity survey was part of a mapping study on fractures in the Excavation Damage Zone (EDZ) of ONKALO underground research facility at Olkiluoto. The EDZ results from excavation of the rock mass, which modifies stress conditions changing the nature
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Anisotropic mechanical behavior of ultra-deep shale under high in-situ stress, a case study in the Luzhou block of the southern Sichuan Basin, China Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-26 Guokai Zhao, Yintong Guo, Chunhe Yang, Lei Wang, Wuhao Guo, Hanzhi Yang, Xiaolong Wu, Hejuan Liu
The safe and efficient development of ultra-deep shale gas deeper than 4500 m is closely related to the comprehensive evaluation of the mechanical behavior, brittleness and anisotropy characteristics of reservoir rocks under in-situ stress conditions. However, the above-mentioned information about ultra-deep shale is rarely reported. This study aims to fill this gap by systematically investigating
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Characterization of the negative Poisson's ratio effect of the thermal-damaged crystalline rock by the grain-based model Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-26 Xiaolin Huang, Ling Xu, Tengyuan Zhao, Shifeng Lu, Zhonghao Sun, Dong Ding
A natural rock often has a positive Poisson's ratio during compression. However, the thermal-damaged rock can abnormally present a negative Poisson's ratio. Thus far, the related mechanism has not been fully clarified from a micromechanical viewpoint. Here, we established a grain-based model to characterize the negative Poisson's ratio effect of the thermal-damaged crystalline rock using the universal
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A novel model for air velocities in airblast events in block caving mining Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-25 Martín Rojas, Rodolfo Morales, Adeline Delonca, Eduardo Rojas, Emilio Farias, Sergio Palma
An airblast is a sudden collapse of a large volume of rock that causes air to rapidly flow through an underground opening as a result of air being compressed in a small space. Through the solution of the Ergun equation for turbulent flows in porous media, we have modeled air gusts in this paper. To resolve the issue, we use the finite element method (FEM). At a drawbell’s associated drawpoints, air
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Impact of stress-driven crack growth on the emergence of anomalous transport in critically connected natural fracture networks Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-26 Xiaoguang Wang, Chuanyin Jiang, Qinghua Lei, Lijun Liu
We study the role of in-situ stresses in fluid flow and mass transport through a two-dimensional fractured rock. The fracture network is based on a real outcrop with a connectivity state around the percolation threshold. We simulate stress-dependent fracture propagation and deformation using a geomechanics model based on the hybrid finite-discrete element method. The hydrodynamic transport through
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A general equivalent continuum model and elastic wave velocity analysis of jointed rock masses Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-25 Dongjie Hua, Qinghui Jiang
The presence of joints dramatically affects the mechanical behavior of rock mass. For highly fractured jointed rock mass, it is more convenient to treat the jointed rock mass as equivalent continuum material. Consequently, several researchers have proposed continuum models to describe the mechanical behavior of jointed rock mass. These models are reviewed and their limitations are discussed. From the
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Complementation of analytical solutions for the quantitative roof stability analysis of rock cavities and tunnels Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-24 Dowon Park
This study revisited a well-founded analytical solution describing the collapse profiles of tunnel roofs and estimated traditional stability measures to be used for quantitative safety assessment and practical engineering design. The original analytical approach was proposed by Fraldi and Guarracino based on a variational approach in the context of limit analysis, and subsequently extended to account
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Effects of surface roughness and shear processes on solute transport through 3D crossed rock fractures Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-23 Bo Li, Jiujun Xu, Jie Zhong, Na Huang, Liangchao Zou
The influences of surface roughness and shear processes on fluid flow and solute transport through three-dimensional (3D) crossed rock fractures, a vital element of fracture networks, were systematically investigated. Surfaces of tensile fractures created by splitting granite and sandstone samples along its two orthogonal central axes were optically scanned to generate rough-walled crossed fracture
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Comparison of high-frequency components in acoustic emissions from rock fracture under Mode Ⅰ and Mode Ⅱ dominated loading Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-22 Hua Li, Fei Wang, Fei Chen, Jianhui Deng, Siyuan Zhao
High-frequency components in acoustic emission (AE) or seismic radiation attract much attention as they are directly related to the fracture process. One of the main issues in our knowledge of high-frequency radiation is a lack of definition on the relationship between high-frequency content and source mechanisms. In this study, high-frequency emission waves due to rock fracture in tension and shear
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Thermo-hydro-mechanical-chemical coupling in chalk reservoirs: Impact on fluid flow and deformation during water injection Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-22 Seyedbehzad Hosseinzadehsadati, Frédéric Amour, Mohammad Reza Hajiabadi, Hamidreza M. Nick
Reliable prediction of the rate- and fluid-dependent evolution of elasto-plastic strain in chalk is essential to minimize the risk associated with sea-floor subsidence and subsurface deformation. Experimental observations show that physicochemical interaction between the aqueous solutions and rock surface causes the change of mechanical properties in chalk. Here, we quantify the experimental observations
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Determination of heat transfer representative element volume and three-dimensional thermal conductivity tensor of fractured rock masses Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-21 Zheng-Wei Li, Chuan-Yuan Huang, Hai-Xi Wang, Shi-Cheng Xing, Meng-Cheng Long, Yuan Liu
The natural fracture system exerts a significant influence on the physical and mechanical properties of rock masses. The heat transfer in fractured rock masses is much more complicated than that of intact rock due to the thermal contact resistance induced by natural fractures with varying size, aperture, roughness, and orientation. This work describes a method for determining the representative element
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Mechanical behavior and failure mechanism of composite layered rocks under dynamic tensile loading Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-22 Sen Wen, Ruizhi Huang, Chunshun Zhang, Xianwei Zhao
To bolster the safety and efficacy of blasting and impact drilling for underground works in composite rock strata, the dynamic tension of composite rocks requires thorough examination. Given the challenges of composite rock sampling, cement mortars with varying mix ratios are utilized to create composite rock-like test blocks. These blocks are composed of two different strength materials, further processed
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Direct prediction of relative permeability curve from 3D digital rock images based on deep learning approaches Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-22 Chiyu Xie, Jingwei Zhu, Jiulong Wang, Jiaosheng Yang, Hongqing Song
The relative permeability curve is one of the key features to evaluate the flow property of a porous medium, which is important in petroleum and gas industry, yet it is not easy to obtain. In this study, we proposed a new intelligent way to predict the relative permeability curves directly from 3D digital rock images, compared with other existing artificial intelligence (AI) methods that usually used
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Improving block caving production by incorporating operational risks in short-term scheduling Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-22 Matías Pereira, Raúl Castro, Fabián Manríquez
In caving mines, productivity and safety can be affected by geotechnical hazards, such as rockbursts, inrushes, collapses, and air blasts. These operational risks decrease the availability of drawpoints and impact compliance with the short-term mine production schedule. In these cases, the mine production schedule has to be updated, modifying the amount of mineral extracted from the drawpoints and
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Investigation of dynamic response of drilling parameters and deformation characteristics of coal around borehole during multi-stage reaming in tectonic coal Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-20 Jishi Geng, Liwen Cao, Congyu Zhong, Hao Wang, Baiqiao Chen
Tectonic coal refers to the coal with varying degrees of brittle fracture or ductile deformation under the action of one or multi-period tectonic stresses, showing the characteristics of low mechanical strength, weak cohesion and large deformation. Therefore, drilling in tectonic coal is easy to cause the aperture shrinkage or closure due to the poor anti-deformation capability. Enlarging the initial
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Laboratory acousto-mechanical study into moisture-induced changes of elastic properties in intact granite Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-21 Rui Wu, Paul Antony Selvadurai, Ying Li, Yongyang Sun, Kerry Leith, Simon Loew
The water adsorption into pore spaces in brittle rocks affects wave velocity and transmitted amplitude of elastic waves. Experimental and theoretical studies have been performed to characterize moisture-induced elastodynamic variations due to macroporous effects; however, little attention has been paid to the manner in which wetting of nanopores affects elastic wave transmission. In this work, we extend
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Deformation behaviour, crack initiation and crack damage of weathered composite sandstone-shale by using the ultrasonic wave and the acoustic emission under uniaxial compressive stress Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-18
Anticipating the progressive damage and strength of an anisotropic and interbedded rock mass is challenging due to the overwhelming variables which need to be considered. Therefore, the strength and progressive damage of each rock material is not a realistic model which can be used to define the deformation of the interbedded anisotropic rock mass. In this research, weathered (sandstone-shale-sandstone)
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Mechanical properties and failure characteristics of anisotropic shale with circular hole under combined dynamic and static loading Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-20
In deep hard rock mines, the drilling and blasting method is mainly used for mining, which results in a complex environment of high static stress and frequent dynamic disturbance in some underground engineering surrounding rocks for a long time. In addition, a large number of underground engineering are in the geological tectonic zone with poor stability, which often triggers rock disasters when stress
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Propagation of multiple hydraulic fractures in a transversely isotropic shale formation Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-18
Shale anisotropy can lead to deviated patterns of hydraulic fractures in multi-stage hydraulic fracturing (MSHF) operations, significantly hindering hydrocarbon production. Such deviation usually occurs in formations where the induced fractures interfere with natural bedding planes or where the stress shadow is created. In this work, the elastic behavior of a transversely isotropic shale rock during
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Using in-situ strain measurements to evaluate the accuracy of stress estimation procedures from fracture injection/shut-in tests Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-17
Fracture injection/shut-in tests are commonly used to measure the state of stress in the subsurface. Injection creates a hydraulic fracture (or in some cases, opens a preexisting fracture), and then the pressure after shut-in is monitored to identify fracture closure. Different interpretation procedures have been proposed for estimating closure, and the procedures sometimes yield significantly different
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Identification method for microseismic, acoustic emission and electromagnetic radiation interference signals of rock burst based on deep neural networks Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-17
Microseismic, acoustic emission, and electromagnetic radiation (MS, AE, and EMR) are promising methods for the monitoring and early warning of rock bursts. In the underground mining process, personnel activities and electromechanical equipment produce MS, AE, and EMR interference signals that affect the accuracy of MS, AE, and EMR monitoring. This study is aimed at overcoming the difficulties in identifying
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A micromechanical thermo-hydro-mechanical coupling model for fractured rocks based on multi-scale structures variations Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-17
Under the thermodynamics framework, a thermo-hydro-mechanical coupling model was established by a multi-scale homogenization technique for fractured rock mass containing both small-scale arbitrarily-distributed microcracks and large-scale grouped-directionally-distributed fractures. The proposed model simultaneously considers the deformation evolution and permeability and thermal conductivity variations
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Experimental investigation of strength repairing effects of chemical grouting on fractured porous sandstone under different temperature conditions Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-15
Investigation of the seepage characteristics and the corresponding repairing effects of slurry on fractured rock mass is of great significance to grouting theory and operation parameters designing. Several chemical grouting tests under different temperatures and grouted pressures were conducted and the seepage processes were monitored by the LF-NMR (low field nuclear magnetic resonance) technique.
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The experimental determination of shear stress distribution along fully grouted rock bolts with different bond lengths subjected to pull testing Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-19
In this study, laboratory pull tests of rock bolts were conducted to verify and update existing stress transfer models. The rock bolt samples in the study had different bond lengths that were fully encapsulated in cementitious grout with different water-cement ratios. The test results show that the existing models do not correctly describe the shear stress distribution on the bond length in some loading
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Numerical and experimental investigation of the anisotropic tensile behavior of layered rocks in 3D space under Brazilian test conditions Int. J. Rock Mech. Min. Sci. (IF 7.2) Pub Date : 2023-07-15
Brazilian disc (BD) testing is a typical method for measuring the indirect tensile strength of rock materials. Both experimental and theoretical studies involving BD testing of anisotropic rocks typically focus on the influence of the 2D bedding effect, where a specimen is parallel to the bedding planes, whereas the influence of the 3D bedding effect combining both the orientation and loading angle