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深部煤矿开采过程中的动载扰动可能诱发巷道围岩冲击失稳，为揭示动载扰动与围岩冲击破坏的关系，采用PFC数值模拟方法，分析了采动应力、动载荷和震源位置对巷道围岩冲击破坏与能量释放的影响规律。研究结果表明：相同动载扰动下，巷道围岩整体变形随采动应力的增大逐渐增大，较大动载荷会引起巷道顶板的显著下沉，且近震源侧的巷道帮部位移较大。低采动应力和动载荷条件下，动载扰动诱发巷道围岩破坏的能量释放主要集中于两帮煤体，表现出由巷道浅部向深部的多频次小能量释放，两帮煤体呈渐进式破坏；高采动应力和动载荷条件下，巷道两帮深部煤体表现为突然的大面积失稳和快速的能量释放。动载扰动下巷道围岩冲击危险除与动载扰动能量有关，还取决于围岩的能量释放量级。当采动应力或动载荷增大到一定程度时，围岩破坏能量释放量级增大，表现为突然的大能量释放，具有较大的冲击危险。研究结果可为深入了解煤矿动载扰动与巷道冲击破坏的关系及其防治提供参考。
Abstract：Coal mining at great depths triggers dynamic disturbances, potentially inducing rockbursts in the surrounding rock of the roadway. To explore the relationship between dynamic disturbances and the rockburst failure in surrounding rock of roadway, the PFC numerical simulation method is used, and the effects of induced stress, dynamic disturbance intensity, and disturbance source location on the failure characteristics and energy release of surrounding rock is analyzed. The study reveals that under the same dynamic disturbance conditions, the overall deformation of surrounding rock increases with the increase of mining stress. When the disturbance load becomes significant, it may lead to substantial roof subsidence. The displacement of the wall of the roadway near the disturbance source is significantly higher than that on the other side. Under the low mining-induced stress or dynamic disturbance intensity, the energy release gradually transits from shallow coal to deep over time, characterized primarily by a progressive failure and numerous small energy releases. However, when the mining-induced stress or dynamic disturbance intensity is high, the coal mass deep in the surrounding rock exhibit sudden and large-scale failure, accompanied by rapid release of a large amount of elastic energy. The rockburst hazard of surrounding rock under dynamic disturbance not only depends on the energy magnitude of dynamic disturbance but also on the magnitude of energy released from surrounding rock. When the mining-induced stress or dynamic disturbance intensity increases to a certain level, the magnitude of energy released from surrounding rock significantly increases, posing a high rockburst hazard. These findings contribute to a deeper understanding of the relationship between dynamic disturbance and impact failure in coal mines, providing reference for the prevention and control of rockburst disaster.
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基本信息:
DOI：10.13532/j.jmsce.cn10-1638/td.2024.04.002
中图分类号:TD324
引用信息:
[1]马斌文,谢和平,张修峰,等.动载扰动下巷道围岩冲击破坏与能量释放规律研究[J].采矿与岩层控制工程学报,2024,6(04):5-22.DOI:10.13532/j.jmsce.cn10-1638/td.2024.04.002.
基金信息:
国家重点研发计划资助项目(2022YFC3004602);; 国家自然科学基金资助项目(52325404);; 珠江人才计划引进创新创业团队资助项目(2019ZT08G315);; 山东能源集团2022年揭榜挂帅资助项目(SNKJ2022A01-R26);; 深圳市基础研究资助项目(JCYJ20220818095605012);; 深圳大学2035卓越研究计划资助项目(2022B001)
2024-04-27
2024
2024-07-02
2024
1
2024-08-15
2024-08-15