A MESOSCOPIC NUMERICAL MODEL FOR SIMULATION OF ROCK FRACTURING
YAO Chi1，JIANG Qinghui1，2，SHAO Jianfu3，ZHOU Chuangbing1，2
(1. School of Civil Engineering，Wuhan University，Wuhan，Hubei 430072，China；
2. State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan，Hubei 430072，China；
3. Laboratoire de Mecanique de Lille，Villeneuve a′Ascq Cedex，59655，France)
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.
姚 池1，姜清辉1，2，邵建富3，周创兵1，2. 一种模拟岩石破裂的细观数值计算模型[J]. 岩石力学与工程学报, 2013, 32(s2): 3146-3153.
YAO Chi1，JIANG Qinghui1，2，SHAO Jianfu3，ZHOU Chuangbing1，2. A MESOSCOPIC NUMERICAL MODEL FOR SIMULATION OF ROCK FRACTURING. , 2013, 32(s2): 3146-3153.
DONZE F V，RICHEFEU V，MAGNIER S A. Advances in discrete element method applied to soil，rock and concrete mechanics[J]. Electronic Journal of Geotechnical Engineering，2009，14(8)：1-44.
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2013, Vol. 32 
