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<p>In order to investigate the influence of different fracture shapes on the strength, displacement field and energy evolution of rock specimens, laboratory uniaxial compression tests were carried out. Combined with digital image correlation technology (DIC) and two-dimensional discrete element particle flow code (PFC<sup>2D</sup>), the rock specimens with different fracture shapes were studied thoroughly. The results show that: (1) From the macroscopic point of view, the linear, rectangular and semicircular cracks tend to cause tensile–shear, while the rock specimens with triangular and trapezoidal cracks are more prone to tensile failure; (2) From the microscopic point of view, linear cracks are most likely to cause rapid crack closure of cracks in the rock, the semicircular crack has a stronger weakening ability on the rock strength, and the trapezoidal crack causes the smallest number of microcracks in the rock. (3) From the perspective of energy conversion relationship, the strain energy is larger when semicircular and rectangular cracks cause obvious damage to rock specimens, while the strain energy is smaller when the triangular cracks cause damage to the inside of the rock specimen. Therefore, in practical engineering, the failure mechanical properties and crack propagation characteristics of rock under compression can be judged by cracks of different shapes. The research in this paper provides a new idea and method for understanding rock failure.</p>

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Study on the Failure Characteristics of Rocks with Different Crack Shapes Based on Digital Image Correlation and Particle Flow Code

  • 期刊论文

  • 发表日期：

    2025年7月25日

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

摘要

In order to investigate the influence of different fracture shapes on the strength, displacement field and energy evolution of rock specimens, laboratory uniaxial compression tests were carried out. Combined with digital image correlation technology (DIC) and two-dimensional discrete element particle flow code (PFC2D), the rock specimens with different fracture shapes were studied thoroughly. The results show that: (1) From the macroscopic point of view, the linear, rectangular and semicircular cracks tend to cause tensile–shear, while the rock specimens with triangular and trapezoidal cracks are more prone to tensile failure; (2) From the microscopic point of view, linear cracks are most likely to cause rapid crack closure of cracks in the rock, the semicircular crack has a stronger weakening ability on the rock strength, and the trapezoidal crack causes the smallest number of microcracks in the rock. (3) From the perspective of energy conversion relationship, the strain energy is larger when semicircular and rectangular cracks cause obvious damage to rock specimens, while the strain energy is smaller when the triangular cracks cause damage to the inside of the rock specimen. Therefore, in practical engineering, the failure mechanical properties and crack propagation characteristics of rock under compression can be judged by cracks of different shapes. The research in this paper provides a new idea and method for understanding rock failure.