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Abstract A numerical procedure is developed to generate randomly and uniformly distributed Voronoi diagram，which is used as the basic mesh for rigid body spring method(RBSM). The midpoint contact model of original RBSM is modified into distributed interface contact model. A fracture criterion is proposed through combining Mohr-Coulomb law and tension strength，which can account for mode I and mode II fracturing at the same time. It is found from a series of numerical tests that mesh size and mesh arrangement have little effects on the relationship between macro and meso elastic parameters. A fitting relation is given to overcome the problem of mesh dependency of particle discrete element method and to simplify the complex calibration procedure of which for macro-meso parameters identification. Comparison with Vienne rock experiments shows that both strength and deformation analyzed by the proposed model are in good agreement with the experiment data. Thus，the validity of the proposed model is verified.
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Received: 05 November 2012
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2013, Vol. 32 
