Abstract：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.
