(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；3. China Enfi Engineering Corporation，Beijing 100038，China；4. School of Civil Engineering，Southeast University，Nanjing，Jiangsu 211189，China)
Abstract：Real rough joints profile has been rebuilt by PFC2D(particle flow code in 2 dimensions) successfully，and a series of PFC2D numerical simulation direct shear tests have been done to obtain its shear behavior. We can observe the failure process from the viewpoint of mesomechanics through PFC2D. The damage process of asperities on rough surface and the corresponding micro-fracture development can also be monitored in the numerical direct shear tests and these can be treated as a supplement of model tests. Macroscopic deformation of the sample is formed by the accumulation of mesoscopic shear cracks；and the shear failure area of rock mass mainly grows on the climbing slope of joint，where is the shear stress focus area as well. As the peak shear stress appears，the number of shear cracks is increasing quickly，when the failure of rough rock joint is most significant. According to the numerical tests，the results between model tests and numerical tests fit well；so real rock-joint model tests can be partly replaced by PFC2D numerical tests，which can become a way for forecasting the shear strength of real rock joints. The problem that the topography of real rough rock joints is hard to be restored has been solved by the numerical simulation method.
杜守继，朱建栋，职洪涛. 岩石节理经历不同变形历史的剪切试验研究[J]. 岩石力学与工程学报，2006，25(1)：56-60.(DU Shouji，ZHU Jiandong，ZHI Hongtao. Shear tests on rock joints under different shear deformation histories[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(1)：56-60.(in Chinese))
[2]
蒋宇静，王摇刚，李摇博，等. 岩石节理剪切渗流耦合试验及分析[J]. 岩石力学与工程学报，2007，26(11)：2 254-2 259.(JIANG Yujing，WANG Yaogang，LI Yaobo，et al. Experimental study and analysis of shear flow coupling behaviors of rock joints[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(11)：2 254-2 259.(in Chinese))
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2012, Vol. 31 
