基于改进刚体弹簧方法的岩石破坏过程三维模拟

doi:10.13722/j.cnki.jrme.2022.0174

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Abstract Based on the rigid-body-spring method，a new three-dimensional discrete numerical model is proposed to simulate the progressive failure process of brittle rocks. The model describes the interaction between rigid blocks by means of spring-set groups distributed on the interface of blocks. Thus，the progressive crack propagation is naturally considered. To obtain a basic mesh with high homogeneous and isotropic crack direction，a new random Voronoi mesh technology with a growth “nucleus” place strategy is proposed based on the “point saturation” strategy. Then，the basic functions of three-dimensional modified rigid-body-spring method are proposed. Considering mesoscopic shear and tensile failure modes，a failure criterion based on Mohr-Coulomb criterion with maximum tensile strength is established，and the calibration strategy of mesoscopic parameters of the new model is provided. Finally，the proposed model is validated by comparing with the results of laboratory triaxial tests. Effects of the pattern of the spring-sets configuration and the block size on the simulation results are also discussed. The results show that the proposed model can correctly describe non-linear stress-strain responses，evolution of micro-cracks，and macroscopic failure mode of the rocks under different confining pressures.

Key words： rock mechanics rigid block spring method Voronoi mesh rock failure DEM confining pressure effects

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	HE Chen1
	YAO Chi1
	JIANG Qinghui2
	ZHOU Chuangbing1

Cite this article:

HE Chen1,YAO Chi1,JIANG Qinghui2, et al. Three-dimensional numerical simulation of rock failure process based on the modified rigid-body-spring method[J]. , 2023, 42(1): 183-193.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0174 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/I1/183

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