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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.
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Received: 16 April 2012
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2012, Vol. 31 
