<p>Mining activities of near-fault mineral resources are likely to induce a fault slip by changing the stress state of a fault, which can cause significant dynamic geological disasters. This study was based on the engineering problem of mining-induced fault slips in a gold mine. Shear tests of fault-rock specimens were performed using acoustic emission and static strain monitoring technologies. This study considered two factors: static stress loading and dynamic stress disturbance. The findings revealed that the fault slip of the specimen was caused by a slight dynamic stress disturbance under high-stress conditions. Among these, static and dynamic stresses served as continuous and transient power sources, respectively, providing an environment for the expansion of cracks before the occurrence of a fault slip. Furthermore, the dynamic stress disturbance induces fault slip by altering the contact compactness between the hanging wall and foot wall. A comparison of the schemes showed that dynamic stress disturbance reduces the peak stress condition required for a fault slip and that the fourth dynamic stress disturbance plays a “trigger” role. Based on the above results, relevant measures such as optimizing blasting intervals and stress relief sequencing to ensure fault stability in near-fault mining were proposed. The research results can deepen the understanding of the fault slip mechanism induced by the combination of dynamic and static actions and provide important technical support for the targeted prevention and control of fault slip–based ground pressure disasters and the systematic optimization and control of mining processes.</p>

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Study on the Mechanism of a Fault Slip Under the Alternating Action of Gradient Static Stress Loading Superimposed on Dynamic Stress Disturbance

  • Hongxu Shi,
  • Jianpo Liu,
  • Yongxin Wang,
  • Song Cui,
  • Xiaonan Wang

摘要

Mining activities of near-fault mineral resources are likely to induce a fault slip by changing the stress state of a fault, which can cause significant dynamic geological disasters. This study was based on the engineering problem of mining-induced fault slips in a gold mine. Shear tests of fault-rock specimens were performed using acoustic emission and static strain monitoring technologies. This study considered two factors: static stress loading and dynamic stress disturbance. The findings revealed that the fault slip of the specimen was caused by a slight dynamic stress disturbance under high-stress conditions. Among these, static and dynamic stresses served as continuous and transient power sources, respectively, providing an environment for the expansion of cracks before the occurrence of a fault slip. Furthermore, the dynamic stress disturbance induces fault slip by altering the contact compactness between the hanging wall and foot wall. A comparison of the schemes showed that dynamic stress disturbance reduces the peak stress condition required for a fault slip and that the fourth dynamic stress disturbance plays a “trigger” role. Based on the above results, relevant measures such as optimizing blasting intervals and stress relief sequencing to ensure fault stability in near-fault mining were proposed. The research results can deepen the understanding of the fault slip mechanism induced by the combination of dynamic and static actions and provide important technical support for the targeted prevention and control of fault slip–based ground pressure disasters and the systematic optimization and control of mining processes.