An Analysis Model of UDEC for Crack Propagation and Numerical Simulations for Specimens with Double Pre-Existing Cracks
An UDEC analysis model composed of triangular blocks for crack propagation was proposed.In the proposed model,a FEM mesh of triangular elements was generated in the interesting area by a finite ele-ment software first.Then the FEM mesh was converted into an UDEC mesh by a transformation program.The UDEC mesh was composed of triangular blocks and joints on the boundary of simulated blocks.The joints included virtual joints and real joints.These virtual joint interfaces provided paths along which cracks could generate and propagate.Its failure was controlled by the model of Joint model SS which was provide by UDEC.The proposed analysis model of UDEC was used for simulating the generation,propagation and coalescence of rock cracks.The transformation program of the proposed model was developed.To verify the correctness of the algorithm,three numerical examples of test samples with double parallel pre-existing cracks under uniaxial compression were computed.The simulated results were compared with the ones of existing tests.The simulated laws of crack propagation were in accordance with the phenomena observed in the tests.Those indicated that the proposed UDEC analysis model for cracks propagation was correct and ef-fective.
rock mechanicscrack propagationdiscrete elementUDECsimulation
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