高位钻场瓦斯抽采技术在高瓦斯复杂煤层回采中的应用研究

Application of Gas Drainage Technology of High Level Drilling Site in High-Gas Complex Coal Extraction

通过对李雅庄矿多个回采工作面瓦斯来源的现场测试及理论分析,得出采场围岩瓦斯涌出是导致该矿回采工作面高瓦斯的主要来源,其涌出量占到总涌出量的60%以上。针对该矿煤层顶、底板多为沙质泥岩,其孔隙、裂隙相当发育的特点。提出了高瓦斯复杂煤层回采工作面瓦斯治理新思路。即:采取了在本煤层和邻近层瓦斯抽采技术与顶板钻孔和高位钻场底板高位裂隙钻孔的瓦斯联合抽采方式,并确定了瓦斯抽采的基本参数。从该矿2-602工作面采用高位钻场14个月的瓦斯抽采效果来看,抽采率达到了60.87%,有效地降低了工作面的瓦斯涌出量,为安全高效开采高瓦斯复杂煤层提供了技术保障。

According to field test and theoretical analysis of gas in multiple heading faces in Liyazhuang Mine,the surrounding rock gas in stope,which accounts for above 60%of the whole emission,is the main source of the coalface gas emission.Based on seam roof and floor of the coal mine,which are made of sandy mudstone,and quitely developed pore and fracture,a new way to control the high gas in complex coal seam was put forward.The techonlogy of gas drainage in mining coal bed and adjacent seams was combined with the roof drilling and high fracture drilling in the high drilling field floor.The basic parameters in the gas drainage were determined.After14months＇ gas drainage in 2-602 working faces,the drainage rate reached 60%,which effectively reduced the gas emission in the working face,which provided technical support for drainage in high gas complex coal seam.