为了保证回来工作面工作安全和高产,必须用综合方法选择工作面抽放瓦斯、通风和采准的最有效方式,并考虑到其他工艺过程。工作面通风和抽放瓦斯方式的重要标志是:回采工作面风流方向和工作面相对煤层倾斜线的推进方向;抽放瓦斯孔或瓦斯管道支管的位置;钻孔方向相对于回采工作面推进的方向。 In order to ensure the safe and productive work of returning to the working face, the most effective way of draining gas, ventilation and quarrying on the working face must be selected by a comprehensive method, taking into account other technological processes. Important signs of face ventilation and gas drainage methods are: the direction of wind flow in mining face and the advancing direction of coal seam slant line on face; the location of drainage gas holes or gas pipe branch pipes; the direction of drilling direction relative to mining face direction.