SIMULATION OF ROCK CRACK PROPAGATION USING DISCONTINUOUS DEFORMATION ANALYSIS METHOD
用非连续变形分析方法模拟岩石裂纹扩展

An approach for modeling rock crack propagation using discontinuous deformation analysis(DDA) method is presented.In the proposed approach,the triangular block system is automatically generated in the area of interest by adopting the advanced front method.During this process,numerous artificial joint interfaces,compared to real joint interfaces,come into being.These artificial joint interfaces provide the paths along where cracks generate and propagate.The strength of the artificial joint takes the same value as that of the intact rock;and the failure of the artificial joint is controlled by the maximum tensile-stress criterion and Mohr-Coulomb criterion.In this wayt,he proposed method can easily simulate the generation,propagation and coalescence of rock crack;the whole process of rock fragmentation is thereafter reproduced.Moreover,with the introduction of the artificial joint concept into the discontinuum-based modelt,he proposed approach can be used to simulate the cases of continuum,semicontiuum as well as discontinuum without any mathematic difficulty.Based on the proposed algorithm,the corresponding VC++ program module is developed.For verification,several numerical examples are computed to study the propagation and coalescence of the closed joints in rock mass under uniaxial compression.The simulated results are compared with the existing physical and numerical test ones.They show a favorable agreement,and the laws of the crack propagation are in accordance with the phenomena observed in the tests.These indicate that the proposed method for crack propagation analysis is correct and effective.