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Abstract The shear behavior of rock joint is mainly influenced by its morphology and contact states. The macro- parameters of the model material are determined by uniaxial compressive tests for mortar material samples and direct shear tests of smooth joints. The meso-parameters used in particle flow code in 2 dimensions(PFC2D) simulation are calibrated by its macro-mechanical behaviors. Real rough joints model has been rebuilt by PFC2D successfully. And a series of PFC2D numerical direct shear tests have been done for joints under different morphologies and contact states，and the peak shear strength is got. Direct shear test of artificial rock joints is used to check the accuracy of the results by numerical tests. The results of numerical tests fit well with the physical experimental tests. Numerical test can be used as a supplementary method to estimate the peak shear strength of rock joints with various morphologies under different normal stress conditions. The influence of morphology degradation during the direct shear test on the peak shear strength can be solved by numerical shear tests；and the peak shear strength of joint under different contact states also can be estimated based on part of physical experimental tests. And then，the morphology of joints with different roughnesses can be measured in the field；and the peak shear strength under different contact states and different normal stresses can be predicted. The problem that sampling and preparation of joint samples with same morphology in direct shear test has been solved by the numerical method. The numerical method has the characteristics of economic，convenient，quick and effective and repeatable.
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Received: 28 May 2013
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2013, Vol. 32 
