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Updated: Sep 9, 2025

Stress Distribution During Cold Compression of Rocks and Mineral Aggregates Using Synchrotron-based X-Ray Diffraction
Published on: May 20, 2018
Study on Failure Characteristics and Fracture Susceptibility of Surrounding Rock Under True Triaxial Stress
Chongyan Liu1, Cheng Pan2,3, Guangming Zhao1
1Key Laboratory of Safe and Effective Coal Mining, Ministry of Education of China, Anhui University of Science and Technology, Huainan 232001, China.
Abstract:
To investigate the failure behavior and cracking mechanisms in surrounding rock, a true triaxial experimental system and digital imaging were employed to perform compression tests on sandstone specimens containing preexisting flaws. Experimental results revealed the propagation characteristics of microfractures under stress concentration conditions and their correlation with failure patterns. Furthermore, a fracture propagation model was implemented to evaluate the susceptibility of surrounding rock to failure. Macroscopic analysis identified four distinct failure phases: quiescent, particle ejection, stable damage, and structural collapse. The load-bearing capacity demonstrated positive correlation with in situ stress magnitude, while deformation accommodation capacity followed a nonmonotonic trajectory characterized by initial enhancement followed by deterioration. Furthermore, the analysis of influencing factors on surrounding rock failure identified the order of sensitivity as in situ stress > crack angle > crack size > friction coefficient. Furthermore, the reason for V-shaped failure crater of surrounding rock was clarified through intermediate parameter of critical compressive strength. This research provides valuable insights that can be referenced for designing strategies to control roadway stability.
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