Investigation on the macro-meso fatigue damage mechanism of rock joints with multiscale asperities under pre-peak cyclic shear loading

The fatigue damage mechanical behaviours of rock joints under pre-peak cyclic shear loading are one of the key factors affecting the dynamic stability of slopes. In this study, the macro-meso fatigue damage mechanism of rock joints with multiscale asperities, when considerthe influence of the normal...

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Vydané v:	Soil dynamics and earthquake engineering (1984) Ročník 151; s. 106958
Hlavní autori:	Xu, Bin, Liu, Xinrong, Zhou, Xiaohan, Xie, Yingkun, Suliman, Lojain, Liu, Xinlin, Lin, Guangyi, Huang, Junhui
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Barking Elsevier Ltd 01.12.2021 Elsevier BV
Predmet:	Abrasion Compacting Compression Contraction Cyclic loads Damage Deformation Discrete element method Displacement Dynamic stability Elastic deformation Evolution Evolution process Failure mode Failure modes Fatigue damage mechanism Fatigue failure Gnawing Materials fatigue Mathematical analysis Mechanical properties Morphology Numerical simulations Peak load PFC2D meso numerical simulation Plastic deformation Plastic flow Plastics Pre-peak cyclic shear experiment Rock joints Rocks Shear rate Shear strength Shear stress Slope stability Rock joints Failure mode Pre-peak cyclic shear experiment Evolution process PFC2D meso numerical simulation Fatigue damage mechanism
ISSN:	0267-7261, 1879-341X
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Abstract	The fatigue damage mechanical behaviours of rock joints under pre-peak cyclic shear loading are one of the key factors affecting the dynamic stability of slopes. In this study, the macro-meso fatigue damage mechanism of rock joints with multiscale asperities, when considerthe influence of the normal stress, shear rate, shear amplitude, first-order asperity angle, number of shear cycles and joint morphology, were investigated using experimental and numerical approaches under a constant normal load (CNL). The laboratory pre-peak cyclic shear experiments on the saw-tooth rock joints with different first-order asperity angles, i.e., 30°, 45° and 60°, and the same second-order asperity angle of 45°, were first conducted under different influence factors mentioned above. Six evolution stages of the shear stress with the shear displacement, i.e., initial nonlinear shear contraction deformation, approximate linear elastic shear dilation deformation, cyclic fatigue damage deformation, plastic deformation of the local compression-shear fracture, full plastic deformation of the stress brittle drop and ideal plastic flow deformation, were obtained. Additionally, the variation rules of the influence factors mentioned above with the peak (and residual) shear strengths and the cumulative shear (and normal) displacements were explored. Subsequently, the PFC2D discrete element method was used for the meso numerical simulations, in which the meso fatigue damage evolution processes of the saw-tooth and wavy rock joints were simulated considering more number of shear cycles. Meanwhile, the change rules of the meso fatigue damage crack number (and energy) with the shear displacement (and the number of cycles), and the distribution characteristics of the meso fatigue damage particles were observed. Based on the good agreement between the macro experimental results and the meso numerical observations, the macro-meso fatigue damage failure modes of rock joints can be generally summarized as three basic types, i.e., compacting – climbing failure mode, climbing – cyclic abrading – extruding – gnawing failure mode and gnawing – sliding failure mode. •The macro-meso fatigue damage of saw-tooth rock joints with multiscale asperities under pre-peak cyclic shear is studied.•The shear deformation and strength characteristics are obtained.•The impact of normal stress, shear rate (amplitude), first-order asperity angle and cycle number on fatigue damage is probed.•The variation rules of meso fatigue damage crack number and energy are revealed.•The macro-meso fatigue damage evolution process and typical failure modes are discussed.
AbstractList	The fatigue damage mechanical behaviours of rock joints under pre-peak cyclic shear loading are one of the key factors affecting the dynamic stability of slopes. In this study, the macro-meso fatigue damage mechanism of rock joints with multiscale asperities, when considerthe influence of the normal stress, shear rate, shear amplitude, first-order asperity angle, number of shear cycles and joint morphology, were investigated using experimental and numerical approaches under a constant normal load (CNL). The laboratory pre-peak cyclic shear experiments on the saw-tooth rock joints with different first-order asperity angles, i.e., 30°, 45° and 60°, and the same second-order asperity angle of 45°, were first conducted under different influence factors mentioned above. Six evolution stages of the shear stress with the shear displacement, i.e., initial nonlinear shear contraction deformation, approximate linear elastic shear dilation deformation, cyclic fatigue damage deformation, plastic deformation of the local compression-shear fracture, full plastic deformation of the stress brittle drop and ideal plastic flow deformation, were obtained. Additionally, the variation rules of the influence factors mentioned above with the peak (and residual) shear strengths and the cumulative shear (and normal) displacements were explored. Subsequently, the PFC2D discrete element method was used for the meso numerical simulations, in which the meso fatigue damage evolution processes of the saw-tooth and wavy rock joints were simulated considering more number of shear cycles. Meanwhile, the change rules of the meso fatigue damage crack number (and energy) with the shear displacement (and the number of cycles), and the distribution characteristics of the meso fatigue damage particles were observed. Based on the good agreement between the macro experimental results and the meso numerical observations, the macro-meso fatigue damage failure modes of rock joints can be generally summarized as three basic types, i.e., compacting – climbing failure mode, climbing – cyclic abrading – extruding – gnawing failure mode and gnawing – sliding failure mode. The fatigue damage mechanical behaviours of rock joints under pre-peak cyclic shear loading are one of the key factors affecting the dynamic stability of slopes. In this study, the macro-meso fatigue damage mechanism of rock joints with multiscale asperities, when considerthe influence of the normal stress, shear rate, shear amplitude, first-order asperity angle, number of shear cycles and joint morphology, were investigated using experimental and numerical approaches under a constant normal load (CNL). The laboratory pre-peak cyclic shear experiments on the saw-tooth rock joints with different first-order asperity angles, i.e., 30°, 45° and 60°, and the same second-order asperity angle of 45°, were first conducted under different influence factors mentioned above. Six evolution stages of the shear stress with the shear displacement, i.e., initial nonlinear shear contraction deformation, approximate linear elastic shear dilation deformation, cyclic fatigue damage deformation, plastic deformation of the local compression-shear fracture, full plastic deformation of the stress brittle drop and ideal plastic flow deformation, were obtained. Additionally, the variation rules of the influence factors mentioned above with the peak (and residual) shear strengths and the cumulative shear (and normal) displacements were explored. Subsequently, the PFC2D discrete element method was used for the meso numerical simulations, in which the meso fatigue damage evolution processes of the saw-tooth and wavy rock joints were simulated considering more number of shear cycles. Meanwhile, the change rules of the meso fatigue damage crack number (and energy) with the shear displacement (and the number of cycles), and the distribution characteristics of the meso fatigue damage particles were observed. Based on the good agreement between the macro experimental results and the meso numerical observations, the macro-meso fatigue damage failure modes of rock joints can be generally summarized as three basic types, i.e., compacting – climbing failure mode, climbing – cyclic abrading – extruding – gnawing failure mode and gnawing – sliding failure mode. •The macro-meso fatigue damage of saw-tooth rock joints with multiscale asperities under pre-peak cyclic shear is studied.•The shear deformation and strength characteristics are obtained.•The impact of normal stress, shear rate (amplitude), first-order asperity angle and cycle number on fatigue damage is probed.•The variation rules of meso fatigue damage crack number and energy are revealed.•The macro-meso fatigue damage evolution process and typical failure modes are discussed.
ArticleNumber	106958
Author	Xu, Bin Zhou, Xiaohan Xie, Yingkun Huang, Junhui Suliman, Lojain Lin, Guangyi Liu, Xinlin Liu, Xinrong
Author_xml	– sequence: 1 givenname: Bin surname: Xu fullname: Xu, Bin organization: School of Civil Engineering, Chongqing University, Chongqing 400045, PR China – sequence: 2 givenname: Xinrong surname: Liu fullname: Liu, Xinrong email: liuxrong@cqu.edu.cn organization: School of Civil Engineering, Chongqing University, Chongqing 400045, PR China – sequence: 3 givenname: Xiaohan surname: Zhou fullname: Zhou, Xiaohan email: zhouxh2008@cqu.edu.cn organization: School of Civil Engineering, Chongqing University, Chongqing 400045, PR China – sequence: 4 givenname: Yingkun surname: Xie fullname: Xie, Yingkun organization: Chongqing Chuandongnan Survey & Design Institute Co., Ltd., Chongqing 400038, PR China – sequence: 5 givenname: Lojain surname: Suliman fullname: Suliman, Lojain organization: School of Civil Engineering, Chongqing University, Chongqing 400045, PR China – sequence: 6 givenname: Xinlin surname: Liu fullname: Liu, Xinlin organization: School of Civil Engineering, Chongqing University, Chongqing 400045, PR China – sequence: 7 givenname: Guangyi surname: Lin fullname: Lin, Guangyi organization: Changzhou Architectural Research Institute Groupe Co., Ltd., Changzhou 213001,Jiangsu, PR China – sequence: 8 givenname: Junhui surname: Huang fullname: Huang, Junhui organization: School of Civil Engineering, Chongqing University, Chongqing 400045, PR China
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Keywords	Rock joints Failure mode Pre-peak cyclic shear experiment Evolution process PFC2D meso numerical simulation Fatigue damage mechanism
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Snippet	The fatigue damage mechanical behaviours of rock joints under pre-peak cyclic shear loading are one of the key factors affecting the dynamic stability of...
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SubjectTerms	Abrasion Compacting Compression Contraction Cyclic loads Damage Deformation Discrete element method Displacement Dynamic stability Elastic deformation Evolution Evolution process Failure mode Failure modes Fatigue damage mechanism Fatigue failure Gnawing Materials fatigue Mathematical analysis Mechanical properties Morphology Numerical simulations Peak load PFC2D meso numerical simulation Plastic deformation Plastic flow Plastics Pre-peak cyclic shear experiment Rock joints Rocks Shear rate Shear strength Shear stress Slope stability
Title	Investigation on the macro-meso fatigue damage mechanism of rock joints with multiscale asperities under pre-peak cyclic shear loading
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