首页|Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions
Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions
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To reveal the mechanism of shear failure of en-echelon joints under cyclic loading,such as during earthquakes,we conducted a series of cyclic shear tests of en-echelon joints under constant normal stiffness(CNS)conditions.We analyzed the evolution of shear stress,normal stress,stress path,dilatancy characteristics,and friction coefficient and revealed the failure mechanisms of en-echelon joints at different angles.The results show that the cyclic shear behavior of the en-echelon joints is closely related to the joint angle,with the shear strength at a positive angle exceeding that at a negative angle during shear cycles.As the number of cycles increases,the shear strength decreases rapidly,and the difference between the varying angles gradually decreases.Dilation occurs in the early shear cycles(1 and 2),while contraction is the main feature in later cycles(3-10).The friction coefficient decreases with the number of cycles and exhibits a more significant sensitivity to joint angles than shear cycles.The joint angle determines the asperities on the rupture surfaces and the block size,and thus determines the subsequent shear failure mode(block crushing and asperity degradation).At positive angles,block size is more greater and asperities on the rupture surface are smaller than at nonpositive angles.Therefore,the cyclic shear behavior is controlled by block crushing at positive angles and asperity degradation at negative angles.
En-echelon jointCyclic shear testsShear stressNormal displacementConstant normal stiffness(CNS)
Bin Wang、Yujing Jiang、Qiangyong Zhang、Hongbin Chen、Richeng Liu、Yuanchao Zhang
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Graduate School of Engineering,Nagasaki University,Nagasaki,852-8521,Japan
Research Center of Geotechnical and Structural Engineering,Shandong University,Ji'nan,250061,China
State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,221116,China
College of Civil Engineering,Fuzhou University,Fuzhou,350108,China
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National Natural Science Foundation of ChinaTaishan Scholars Project Special Funding,and Shandong Energy Group
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