综放开采支承压力与卸压瓦斯运移关系研究

RELATION BETWEEN ABUTMENT PRESSURE AND RELIEVED GAS DELIVERY FOR FULLY-MECHANIZED TOP COAL CAVING

富含瓦斯厚煤层综放开采后,煤岩体中的卸压瓦斯运移规律与其渗透性密切相关,而支承压力变化又对渗透性有很大的影响,即采场卸压瓦斯的运移规律明显受支承压力的影响。分析了采动影响下煤岩卸压瓦斯的流动特性,并根据靖远煤业公司魏家地矿110综放面的矿压观测及瓦斯监测结果,分析得到综放采场前方支承压力及其作用下渗透系数随工作面距离变化的曲线,进而得出综放面支承压力与卸压瓦斯运移的关系,为有效防治综放开采工作面瓦斯事故和合理抽取并利用瓦斯资源提供了理论依据。

After mining in methane-rich thick seams,the law of relieved gas delivery in coal and rock mass is closely related to its permeability,which is influenced by the change of abutment pressure. In other words,the law of relieved gas delivery of coal caving is influenced obviously by the abutment pressure. The flow characteristics of relieved gas in coal and rock mass influenced by mining are analyzed. Based on the analysis results of ground pressure measuring and gas monitoring in 110# fully-mechanized top coal caving face in Weijiadi Coal Mine,Jingyuan Mining Company,the variation curve of abutment pressure and permeability coefficient with distance from the working face is obtained,and the theoretical foundation for effective prevention of gas accidents in working face of fully-mechanized top coal caving and reasonable drainage and usage of gas resource are provided.