近年来,国内外一些深井和高瓦斯矿井作过采用下行通风代替上行通风的尝试。我国煤矿安全规程对此也作过多次修改:1961年的《煤矿保安暂行规程》规定,瓦斯矿井层倾角超过5度,回风巷道坡度超过10度时,都要采 In recent years, some deep and high-gas mines at home and abroad have made attempts to adopt downward ventilation instead of upward ventilation. China’s coal mine safety regulations have also made several changes to this: 1961 “Provisional Regulations on Coal Mine Safety,” provides that the gas mine pit angle of more than 5 degrees, the return airway slope of more than 10 degrees, we must adopt