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<p>The cracks in underground rock mass have an important influence on the stability of rock mass. In order to explore the deformation and failure characteristics of rock samples with different fracture angles and fracture propagation rules, uniaxial compression test was conducted on rock samples with prefabricated fractures by using digital image correlation (DIC) method and PFC3D, and the stress–strain relationship, deformation field evolution law and failure characteristics of rock samples with different fracture angles were analyzed. The research results indicate the following: (1) When the fracture dip angle is larger and the fracture orientation is closer to the direction of the principal stress, the compressive strength of the rock specimen is greater; (2) the crack propagation process, crack patterns and stress concentration phenomena in rock specimens are all related to the fracture dip angle; (3) The DIC method can effectively capture the evolution of the strain field on the crack surface. The strain field reflects the whole evolution process of crack initiation, main crack formation, and main crack propagation to sample failure. In this paper, the failure law of fractured rock is studied from the perspective of macroscopic digital image processing and granular discrete elements, which provides a new idea and method for understanding rock failure.</p>

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Study on failure characteristics of pre-crack rock based on digital image correlation (DIC) method and particle flow code (PFC3D)

  • 期刊论文

  • 发表日期：

    2025年8月24日

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  • Chao Peng,
  • Yudi Cheng,
  • Xiaotong Du,
  • Wanrong Liu,
  • Congmin Xu,
  • Yulin Sun

摘要

The cracks in underground rock mass have an important influence on the stability of rock mass. In order to explore the deformation and failure characteristics of rock samples with different fracture angles and fracture propagation rules, uniaxial compression test was conducted on rock samples with prefabricated fractures by using digital image correlation (DIC) method and PFC3D, and the stress–strain relationship, deformation field evolution law and failure characteristics of rock samples with different fracture angles were analyzed. The research results indicate the following: (1) When the fracture dip angle is larger and the fracture orientation is closer to the direction of the principal stress, the compressive strength of the rock specimen is greater; (2) the crack propagation process, crack patterns and stress concentration phenomena in rock specimens are all related to the fracture dip angle; (3) The DIC method can effectively capture the evolution of the strain field on the crack surface. The strain field reflects the whole evolution process of crack initiation, main crack formation, and main crack propagation to sample failure. In this paper, the failure law of fractured rock is studied from the perspective of macroscopic digital image processing and granular discrete elements, which provides a new idea and method for understanding rock failure.