1 State Key Laboratory of Mechanical Behavior in Traffic Engineering Structure and System Safety, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
2 State Key Laboratory of Water Resource Protection and Utilizationin Coal Mining, National Institute of Low Carbon and Clean Energy, Beijing 102209, China
To investigate the influence of fissure inclination on the mechanical properties and energy evolution mechanisms of rock during failure, the PFC was employed to establish sandstone specimens containing prefabricated fissures with different inclination angles. The mechanical behavior of these specimens under uniaxial compression was simulated, and the corresponding influence mechanisms of fissure orientation on rock mass response were analyzed. The results indicate that the peak stress of the specimens gradually increases with increasing fissure inclination angle, whereas the peak strain first decreases and then increases, exhibiting a distinct V-shaped variation trend. During the loading process, the total number of cracks generally increases with fissure inclination, while the orientation distribution of cracks shifts correspondingly, reflecting the transition of failure modes under different fissure angles. The internal contact force network is closely associated with crack evolution, with fracture initiation occurring preferentially in regions of concentrated contact forces. As loading progresses, the contact force chains gradually weaken and eventually lose their load-bearing capacity. Acoustic emission (AE) activity of specimens with different fissure inclinations can be divided into three stages: a quiet stage, an active stage, and an intense stage. After the stress reaches its peak value, AE activity increases significantly, accompanied by rapid crack propagation and a sharp rise in AE events, indicating that AE characteristics can serve as an effective precursor for failure warning. With increasing fissure inclination, both the total absorbed energy and the elastic strain energy at peak stress show an increasing trend. The controlling mechanisms of fissure inclination on rock failure patterns and strength evolution was revealed from the perspectives of crack propagation, contact force reconstruction, and energy partitioning. The findings provide a theoretical basis for failure prediction and stability assessment of jointed rock masses.
JIA Kang-jie, JI Dong-liang, LI Hao, YUAN Wei, FENG Huai-ping, LI Xiao-bin.
Progressive Failure and Energy Evolution of Sandstone with Different Fracture Angles under Uniaxial Compression[J].
Science Technology and Engineering, 2026, 26(24): 10330-10341 DOI:10.12404/j.issn.1671-1815.2505447
建立模型后进一步引入平行黏结模型(parallel bond model,PBM)模拟颗粒间的强连接[29]。其可有效描述岩石等脆性材料的破坏机制。当黏结力或弯矩超过其极限强度时,黏结断裂,接触转为普通摩擦接触。通过设定黏结参数(如弹性模量、黏结强度、黏结半径系数等),PBM能较真实地再现材料内部裂纹的萌生与扩展过程。PFC数值模拟所采用的细观参数如表1所示。
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