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<p>To investigate the influence of fissure inclination angle and position on the creep mechanical properties and failure characteristics of rock, stepwise loading uniaxial creep experiments were conducted on fissured rock-like materials. A numerical model of fissured rock was established using the PFC program. The constitutive equations and creep equations for the numerical model were derived and solved. Precise simulation of the entire creep process was achieved through the calibration of mesoscopic parameters. The creep deformation characteristics and crack propagation patterns of fissured rock with different inclination angles and positions were studied. The results indicate that: (1) The fissure inclination angle significantly affects specimen strength and deformation characteristics. A smaller inclination angle leads to a greater reduction in specimen strength. Under identical stress levels, specimens with 30° fissures exhibited the largest axial strain, while those with 0° fissures showed the smallest. (2) Analysis of displacement field evolution during creep revealed that the fissure inclination angle alters the distribution of shear and normal displacements around the fissure, thereby influencing crack propagation paths and failure modes. (3) Fissures closer to the specimen top detrimentally affect overall stability. For low-angle fissures (0°, 30°), positioning 20&#xa0;mm above the specimen centroid resulted in the highest strain and the lowest creep failure stress, indicating the most unfavorable location. The macroscopic failure mode is influenced by fissure position. As the fissure position elevates, the macroscopic creep failure modes of specimens with different inclination angles exhibit specific transformation patterns.</p>

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Experimental study and particle flow analysis of creep characteristics and crack propagation characteristics of different fractured rocks

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Chunliang Dong,
  • Kai Gao,
  • Cheng Pan,
  • Siming Kao,
  • Pan Li,
  • Hongxue Zhang,
  • Jinfeng Xu,
  • Yahui Zheng

摘要

To investigate the influence of fissure inclination angle and position on the creep mechanical properties and failure characteristics of rock, stepwise loading uniaxial creep experiments were conducted on fissured rock-like materials. A numerical model of fissured rock was established using the PFC program. The constitutive equations and creep equations for the numerical model were derived and solved. Precise simulation of the entire creep process was achieved through the calibration of mesoscopic parameters. The creep deformation characteristics and crack propagation patterns of fissured rock with different inclination angles and positions were studied. The results indicate that: (1) The fissure inclination angle significantly affects specimen strength and deformation characteristics. A smaller inclination angle leads to a greater reduction in specimen strength. Under identical stress levels, specimens with 30° fissures exhibited the largest axial strain, while those with 0° fissures showed the smallest. (2) Analysis of displacement field evolution during creep revealed that the fissure inclination angle alters the distribution of shear and normal displacements around the fissure, thereby influencing crack propagation paths and failure modes. (3) Fissures closer to the specimen top detrimentally affect overall stability. For low-angle fissures (0°, 30°), positioning 20 mm above the specimen centroid resulted in the highest strain and the lowest creep failure stress, indicating the most unfavorable location. The macroscopic failure mode is influenced by fissure position. As the fissure position elevates, the macroscopic creep failure modes of specimens with different inclination angles exhibit specific transformation patterns.