在急倾斜突出矿井煤层斜巷掘进中,常因煤层松软,解放不充分,支护不及时等原因,造成煤与瓦斯倾出、垮塌等堵断巷道,引起风流局部短路而发生瓦斯事故。天府矿务局刘家沟矿长期采用铁风筒,有效地避免了此类事故的发生。该矿在急倾斜煤层斜巷的掘进方式是采用下部巷道超前、上部巷道落后,山下向上多巷单头掘进,正负压结合通风的方式施 In steeply inclined coal seam inclined roadway, often due to coal seam soft, inadequate liberation, support is not timely and other reasons, resulting in coal and gas dumping, collapse and other blocking roadway, causing the wind flow short-circuit and gas accident. Tianfu Mining Liujiagou mine long-term use of iron duct, effectively avoiding the occurrence of such accidents. The mine excavation in steeply inclined seam inclined roadway is to use the lower part of the roadway ahead of the upper roadway behind the mountain uphill lane single head driving, positive and negative pressure combined with ventilation