(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Sciences，Beijing 100049，China)
Abstract：A series of joint specimens with the same surface morphology were poured by 3D scanning and printing technology. Direct shear tests were carried out under different normal stress and shear displacement conditions. By analyzing the experimental curves and joint surface damage characteristics，the deterioration of joint surface morphology and its relationship with the weakening of shear strength during post-peak shearing were studied. It was found the three-dimensional roughness parameter based on the Grassilli?s morphology parameters can quantitatively evaluate the deterioration of the joint surface morphology. By introducing the three-dimensional roughness parameter into the JRC_JMC model，the post-peak shear strength weakening model of joints was proposed based on the variation of the JMC and three-dimensional roughness parameter during post-peak shearing. The results obtained by the proposed model agreed well with those by direct tests，which indicated that the proposed model can better characterize the shear strength weakening law of joints at the post-peak shearing part.
彭 勃1，2，刘亚群1，2，李海波1，2，申 辉1，2，吴多华1，2，刘 博1，2，夏 祥1，2 . 基于三维形貌的节理抗剪强度弱化规律研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3191-3200.
PENG Bo1，2，LIU Yaqun1，2，LI Haibo1，2，SHEN Hui1，2，WU Duohua1，2，LIU Bo1，2，XIA Xiang1，2. Study on shear strength weakening law of joints based on 3D topography. , 2021, 40(S2): 3191-3200.
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2021, Vol. 40 
