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针对低透气性高瓦斯煤层群条件下邻近层瓦斯治理难题,基于岩层控制关键层理论,探讨了走向高抽巷抽采瓦斯作用原理,理论研究了走向高抽巷抽采瓦斯的关键技术。研究结果表明:以破断距为判别指标计算各关键层的破断顺序,可据此确定走向高抽巷的合理层位;走向高抽巷与回风巷沿煤层倾向的投影距离由沿倾向的煤层卸压角和采空区上方“O”形圈的宽度确定;初采期可采用伪倾斜后高抽巷抽采邻近层瓦斯。现场跟踪阳煤五矿典型工作面初采期瓦斯风排量、抽采量和涌出量数据,验证了走向高抽巷抽采关键技术应用的可行性,初采期间瓦斯得到合理控制,稳定后抽采率达95%。
Aiming at the problem of gas treatment in adjacent layers under low gas permeability and high gas coal seam group, based on the key layer theory of rock control, the principle of gas drainage in the direction of high gas drainage tunnel is discussed, and the key technologies of gas drainage in the high gas drainage tunnel are theoretically studied. The results show that: the breaking distance is the discriminant index to calculate the breaking sequence of each key layer, so the reasonable horizon to the high pumping road can be determined; the projection distance to the high pumping road and return airway along the coal seam is from the coal seam along the trend Pressure relief angle and the width of the “O” ring at the top of the goaf are determined; The on-site tracking of the gas discharge, the extraction volume and the emission data of the first working face of the Yangmei Minmetals validated the feasibility of applying the key technology to the high pumping roadway. During the first mining period, the gas was reasonably controlled and stable After pumping rate of 95%.