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正行矿15#煤层透气性差,瓦斯压力高。轨道下山II段煤巷施工钻孔过程发生喷孔、夹钻等动力现象,抽采效果不佳。在掘进工作面迎头设置爆破孔,两帮设置抽采孔进行深孔预裂爆破后,煤层透气性系数增加,瓦斯抽采浓度和纯量明显提高,消除了煤层突出危险,实现了煤巷快速安全掘进。
Positive 15 # coal seam gas permeability is poor, high gas pressure. Downhill II section of the coal seam borehole injection process occurs during construction, such as dynamic drilling phenomenon, pumping effect is poor. In the face of heading face set blasting holes, two sets of pumping holes for deep hole presplit blasting, the permeability coefficient of the coal seam increases, gas extraction concentration and purity significantly increased, eliminating the prominent danger of coal seam to achieve the coal lane fast Safe driving.