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Shear sliding of rough-walled fracture surfaces under unloading normal stress

Journal of Rock Mechanics and Geotechnical Engineering 2023年第10期15卷 2658-2675页

作者： Qian Yin Chun Zhu Jiangyu Wu Hai Pu Qi Wang Yuanchao Zhang Hongwen Jing Tianci Deng State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou221116China School of Earth Sciences and Engineering Hohai UniversityNanjing210098China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing100083China College of Civil Engineering Fuzhou UniversityFuzhou350108China

Through high-precision engraving,self-affine sandstone joint surfaces with various joint roughness coefficients(JRC=3.21e12.16)were replicated and the shear sliding tests under unloading normal stress were conducted regarding various initial normal stresses(1e7 MPa)and numbers of shearing cycles(1 e5).The peak shear stress of fractures decreased with shear cycles due to progressively smooth surface morphologies,while increased with both JRC and initial normal stress and could be verified using the nonlinear Barton-Bandis failure *** joint friction angle of fractures exponentially increased by 62.22%e64.87%with JRC while decreased by 22.1%e24.85%with shearing *** unloading normal stress,the sliding initiation time of fractures increased with both JRC and initial normal stress due to more tortuous fracture morphologies and enhanced shearing resistance *** surface resistance index(SRI)of fractures decreased by 4.35%e32.02%with increasing shearing cycles due to a more significant reduction of sliding initiation shear stress than that for sliding initiation normal stress,but increased by a factor of 0.41e1.64 with *** sliding initiation,the shear displacement of fractures showed an increase in power *** defining a sliding rate threshold of 5105 m/s,transition from“quasi-static”to“dynamic”sliding of fractures was identified,and the increase of sliding acceleration steepened with JRC while slowed down with shearing *** normal displacement experienced a slight increase before shear sliding due to deformation recovery as the unloading stress was unloaded,and then enhanced shear dilation after sliding initiation due to climbing effects of surface *** was positively related to the shear sliding velocity of *** characteristics of the fracture surfaces after shearing failure were evaluated using binary calculation,indicating an increasing shear area ratio by 45.24%e91.02%with normal stress.

关键词： unloading normal stress Rough fracture surface Shear sliding normal displacement Shear wear characteristics

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Experimental and Numerical Study on the Shear Strength and Strain Energy of Rock Under Constant Shear stress and unloading normal stress

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Computer Modeling in Engineering & Sciences 2021年第4期127卷 79-97页

作者： Tantan Zhu Da Huang Jianxun Chen Yanbin Luo Longfei Xu School of Highway Chang’an UniversityXi’an710064China College of Geological Engineering and Geomatics Chang’an UniversityXi’an710064China School of Civil and Transportation Engineering Hebei University of TechnologyTianjin300401China

Excavation and earth surface processes(e.g.,river incision)always induce the unloading of stress,which can cause the failure of *** study the shear mechanical behavior of a rock sample under unloading normal stress conditions,a new stress path for direct shear tests was proposed to model the unloading of stress caused by excavation and other *** effects of the initial stresses(i.e.,the normal stress and shear stress before unloading)on the shear behavior and energy conversion were investigated using laboratory tests and numerical *** shear strength of a rock under constant stress or under unloading normal stress conforms to the Mohr Coulomb *** the initial normal stress increases,the cohesion decreases linearly and the tangent of the internal friction angle increases *** with the results of the tests under constant normal stress,the cohesions of the rock samples under unloading normal stress are smaller and their internal friction angles are larger.A strength envelope surface can be used to describe the relationship between the initial stresses and the failure normal *** dilatancy can decrease the total energy of the direct shear test under constant normal stress or unloading normal stress,particularly when the stress levels(the initial stresses in the test under unloading normal stress or the normal stress in the test under constant normal stress)are *** ratio of the dissipated energy to the total energy at the moment failure occurs decreases exponentially with increasing initial *** direct shear test under constant normal stress can be considered to be a special case of a direct shear test under unloading normal stress with an unloading amount of zero.

关键词： unloading normal stress direct shear test strain energy energy conversion

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