(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.
何忠明，彭振斌. 层状岩体单轴压缩室内试验分析与数值模拟[J]. 中南大学学报：自然科学版，2010，41(5)：1 906-1 912.(HE Zhongming，PENG Zhenbin. Laboratory experiment and numerical simulation for stratified rock mass under uniaxial compression[J]. Journal of Central South University：Science and Technology，2010，41(5)：1 906-1 912. (in Chinese))
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2012, Vol. 31 
