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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。
Taking the fault of 2301N fully mechanized coal caving face of Xinlong Company as engineering background, the law of fault activation in deep and ultra-thick coal seams is studied through microseismic monitoring, numerical simulation and theoretical analysis. The main conclusions obtained are as follows: (1) According to the results of microseismic monitoring of 2301N working face, the fault activation is divided into two stages: stress development phase (274.8 ~ 214 m from fault), energy storage phase (214 ~ 84 m from fault) Which is 84 ~ 0 m away from the fault, and verified by numerical simulation. (2) There are two kinds of dynamic catastrophes such as fault-activated impact and coal pillar-type impact during the fault passing through the fault. The mechanism of fault- The tectonic stress released by the coalescence of coal and rock mass on both sides of the fault is released. The mechanism of percussive coal seam rock burst is mainly due to the high concentration of stress in the coal pillar caused by the mining of the working face. (3) According to the mechanism of rockburst during the fault crossing, Corresponding control technology, and on-site verification, to ensure the safe mining face. The research results have certain reference value for the safe mining of face under similar conditions.