煤层二次封孔技术瓦斯压力测定

Coal seam gas pressure determination of secondary hole sealing technology

由于巷道围岩内存在压力集中,促进瓦斯钻孔周围裂隙发育,在进行煤层瓦斯压力测定过程中出现钻孔封孔不紧密,造成瓦斯泄漏,导致煤层瓦斯压力测定不准确,文中设计了二次封孔技术,对瓦斯压力探测孔封孔进行二次封孔技术,并在西二采区轨道下山进行瓦斯压力测定:1号和2号测压点压力分别为5.2MPa和4.1MPa。钻孔中水对瓦斯压力结果有一定的影响,需修正水压对测压结果的影响。煤层透气性系数小于,属于较难抽采煤层。

due to the existence in roadway surrounding rock stress concentration, promote fracture around the gas drilling, in the process of coal seam gas pressure determination drilling hole sealing is not tight, cause gas leak, result in coal seam gas pressure determination is not accurate, this paper designs the second hole sealing technology, the gas pressure probe hole hole sealing for secondary hole sealing technique,track down the hill and in the west two mining area of gas pressure determination： 1 # and 2 # pressure point pressure 5.2 MPa and 4.1 MPa,respectively.Drilling, water has a certain influence on the gas pressure results need to be modified water pressure on the result of pressure.Coal seam permeability coefficient is less than, belongs to the more difficult to smoke extracting seam.