关键词: 煤矿瓦斯, 底抽巷, 密集钻孔, 浸水蠕变, 围岩控制, 瓦斯抽采

Abstract: In view of the characteristics of Changping coal mine bottom drainage with large deformation, short service life and potential roof collapse, the comprehensive control technology of "steel prestressed grouting anchor cable net shotcrete" is put forward. By field test and laboratory test, the structural and strength characteristics of mudstone in bottom drainage were clarified, and the instability mechanism of fractured mudstone in bottom drainage was revealed. The effectiveness of the proposed comprehensive control technology was verified based on numerical simulation and field test results. The results show that the mudstone of No.3 coal floor drainage tunnel in Changping coal mine has the characteristics of structural fissure, low strength, easy weathering, water softening and remarkable creep characteristics. The deformation of floor drainage roadway induced by dense boreholes and water immersion creep can be well controlled by the presented surrounding rock control technology, which ensures the safe and efficient mining.