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<p>Anisotropic rock has a very different failure mechanism from isotropic rock, and the layers significantly influence the mechanical properties and failure process of surrounding rock. In this study, the bedding plane structure was coupled with the proposed Voronoi grain-based breakable block model (VGBBM) to characterize the layered hard rock, and a simple and effective parameter calibration method was proposed to conduct uniaxial and triaxial compression tests. The numerical results show that the VGBBM can effectively capture the adaptive fracture process under the interaction between the bedding plane and the rock matrix. With increasing layer angle, the following failure modes sequentially occur: matrix dominated (type I), mixed matrix-bedding plane (type II), bedding plane dominated (type III), and type II again. The reasonable range for the strength reduction factor is 0.6–0.8. Under different layer angles, the transition of the failure mechanism controlled by the confining pressure is significantly different. Moreover, the simulation of the interaction between rock and bolts reveals that the confining pressure and reinforcement angle significantly affects the reinforcement effect. This study provides useful insights for the stability analysis of layered surrounding rock and optimization of the support design.</p>

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Study of the Mechanical Characteristics and Crack Evolution of Layered Rocks Using Voronoi Block-Based Finite-Discrete Element Method

  • 期刊论文

  • 发表日期：

    2025年1月12日

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  • Shirui Zhang,
  • Shili Qiu,
  • Quan Jiang,
  • Hong Zheng,
  • Zhenkun Xie,
  • Yuheng Fang

摘要

Anisotropic rock has a very different failure mechanism from isotropic rock, and the layers significantly influence the mechanical properties and failure process of surrounding rock. In this study, the bedding plane structure was coupled with the proposed Voronoi grain-based breakable block model (VGBBM) to characterize the layered hard rock, and a simple and effective parameter calibration method was proposed to conduct uniaxial and triaxial compression tests. The numerical results show that the VGBBM can effectively capture the adaptive fracture process under the interaction between the bedding plane and the rock matrix. With increasing layer angle, the following failure modes sequentially occur: matrix dominated (type I), mixed matrix-bedding plane (type II), bedding plane dominated (type III), and type II again. The reasonable range for the strength reduction factor is 0.6–0.8. Under different layer angles, the transition of the failure mechanism controlled by the confining pressure is significantly different. Moreover, the simulation of the interaction between rock and bolts reveals that the confining pressure and reinforcement angle significantly affects the reinforcement effect. This study provides useful insights for the stability analysis of layered surrounding rock and optimization of the support design.