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针对煤矿采空区上覆岩层裂隙发育,采动裂隙瓦斯流动规律等对合理确定高位钻孔抽采区域的重要性,对采空区上覆岩层的裂隙发育规律和采动裂隙场的瓦斯流动规律进行分析,从采空区覆岩“竖三带”裂隙分布特征、采动裂隙“O”形圈以及U型通风采动裂隙瓦斯流动规律出发,找出采空区对工作面上隅角瓦斯超限影响较大的区域,得出高位钻孔的理论最佳抽采区域大致为工作面后方50 m区域,这个区域的覆岩裂隙发育情况是高位钻孔层位优化设计的关键,为高位钻孔抽采参数优化提供了理论基础。
In view of the development of fissures in the overlying strata of coal mines and the gas flow in the fractured fissures, it is of great importance to properly determine the high-level borehole drainage area. The development of fissures in the overlying strata of the goaf and the gas flow in the fractured fissure From the rule of mined-out area, the distribution characteristics of the overburden strata in the goaf, the distribution of fractures in the “vertical three belts”, the mining fractures, the “O” -shaped rings and the U-shaped ventilation and fissuring gas flow, It is concluded that the theoretical optimum drainage area for high-level drilling is roughly 50 m behind the working face. The development of overlying strata cracks in this area is the optimal design of high-level drilling intervals The key point is to provide a theoretical basis for optimization of drilling parameters in high-level drilling.