深井特厚煤层综放工作面断层活化规律研究

 以新巨龙公司2301N综放工作面过断层为工程背景，通过微震监测、数值模拟和理论分析等方法，对深井特厚煤层断层活化规律进行研究。得到的主要结论为：(1) 根据2301N工作面微震监测结果，将断层活化分为应力显现阶段(距断层274.8～214 m)、蓄能阶段(距断层214～84 m)和结构活化阶段(距断层84～0 m)，并采用数值模拟进行了验证；(2) 工作面过断层期间存在断层活化型冲击和断层煤柱型冲击2类动力灾害，断层活化型冲击的机制主要是开采诱发断层两侧煤岩体积聚的构造应力释放，断层煤柱型冲击地压机制主要是工作面开采引起断层煤柱应力的高度集中；(3) 根据工作面过断层期间冲击地压发生机制，提出相应的防治技术，并进行现场验证，保障了工作面的安全开采。研究结果对类似条件下的工作面安全开采具有一定的借鉴意义。

Fault activation of fully mechanized caving face in extra-thick coal seam of deep shaft

The mechanism of the fault activation in the extra-thick coal seam of deep shaft at the fully mechanized caving face 2301N passing through a fault in Xinjulong Mine was studied using micro seismic monitoring，numerical simulation and theoretical analysis. The process of fault activation was divided into a stress appearance stage(at a distance of 274.8–214 m from the fault)，an energy storage stage(at a distance of 214–84 m from the fault) and a structure activation stage(at a distance of 84–0 m from the fault) according to the microseismic monitoring results，which was verified by numerical simulation. Two kinds of rock burst，fault-activated rockburst and fault-coal-pillar rock burst，both occurred when the working face passed through the fault. The mechanism of fault-activated rock burst was attributed to the accumulated tectonic stress release in both sides of the coal-rock mass adjacent to the fault，and the mechanism of fault-coal-pillar rock burst resulted from the high stress concentration caused by mining activities in fault coal pillar. The corresponding control technologies were put forward based on the analysis of the rock burst mechanisms in the process of working face passing through the fault. The field application of these technologies has effectively ensured the safety of mining passing through the fault.