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Degradation of joint surface morphology, shear behavior and closure characteristics during cyclic loading

Journal of Central South University 2018年第3期25卷 653-661页

作者： FAN Wen-chen CAO Ping LONG Long School of Resources and Safety Engineering Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines Hunan University of Science and TechnologyXiangtan 411201China

In order to investigate the failure mechanism of rock joint,a series of laboratory tests including cyclic direct shear tests under constant normal load(CNL)conditions were *** parameters of the rock joint surface were precisely calculated by means of a three-dimensional laser scanning *** test results were analyzed to investigate the shear behavior and normal displacement behavior of rock joints under CNL *** of rock joint surface during cyclic shear tests was also *** comparison results of the height parameters and the hybrid parameters of the joint surface during cyclic tests show that the degradation of the surface mostly happens in the first shear and the constant normal loads imposed on the joints have significant promotion effects on the morphology *** cyclic shear tests,joints surfaces evolve from rough state to smooth state but keep an overall *** of rock joints degrades with the degradation of joint surface and the increase of normal *** closure deformation of joint is larger than that of the intact rock,and the normal stiffness increases with the increase of shearing times.

关键词： rock joint constant normal load condition surface morphology degradation shear behavior joint closure characteristic

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