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针对邢东矿2222工作面深部带压开采接近临界值且局部受隐伏断层等构造影响,可能出现底板突水的问题,采用ESG微震监测系统实时监测导水裂隙带形成过程,并利用研发的CMMA-3D微震分析系统获得了2222工作面底板导水裂隙带的空间位置,为针对性注浆治理和安全开采提供了重要指导。基于断裂力学分析了隐伏断层活化突水机制,推导出隐伏断层扩展长度计算公式。获得了不同类型隐伏断层(正断层和逆断层)的扩展规律:正断层扩展长度(35)l与承压水压力p和侧压系数?均呈正相关;逆断层扩展长度?l随承压水压力p的增加呈现出先减后增的变化趋势。底板导水裂隙带渗透性随采空区垮落岩体压实度的增加而降低,阐明了2222工作面突水量后期逐渐减小的原因。
In view of the fact that deep pressure mining in Xingdong Ore 2222 working face is close to the critical value and is partially affected by the structures such as hidden faults and faults, the problem of water inrush from the floor may occur. The ESG microseismic monitoring system is used to monitor the formation of water-conducted fractured zone in real time. -3D microseismic analysis system obtained 2222 working face floor aqueduct water gap position, for targeted grouting governance and safe mining provides an important guide. Based on the fracture mechanics, the mechanism of water inrush from buried faults is analyzed, and the calculation formula of the extended length of buried faults is deduced. The law of extension of different types of buried faults (normal faults and reverse faults) is obtained: the normal fault extension length (35) l is positively correlated with the pressure p and lateral pressure coefficient p; The increase of pressure p shows the trend of decreasing first and then increasing. The permeability of the water-carrying fracture zone of the bottom slab decreases with the increase of the compaction degree of the caving rock body in the gob of the goaf, and elucidates the reason of the gradual decrease of the water inrush of the 2222 working face.