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瓦斯喷出分两类:一类是在地质破坏带,在地质作用下,大量沼气从煤和岩石明显的裂缝中集中涌出的现象称为Ⅰ类喷出;另一类是由于进行采掘工程而引起的瓦斯喷出称为Ⅱ类喷出。在远离开采层的煤层与煤线中,也可能发生瓦斯喷出。Ⅰ类喷出的特点是强度大、持续时间长。Ⅱ类喷出通常是突发性的,所以更加危险。瓦斯喷出时,不仅能形成沼气局部集聚,还可能使局部巷道和采区,甚至矿井一翼充满瓦斯。有瓦斯喷出危险的矿井,不论其相对沼气含量如何,均属超级瓦斯矿井。
Gas ejection is divided into two categories: one is in the geological damage zone, under the action of geology, a large number of marsh gas from coal and rocks in the obvious gushing out of the phenomenon known as Class Ⅰ discharge; the other is due to excavation works Gas discharge caused by the so-called Ⅱ class discharge. Gas outfalls may also occur in coal seams and coal lines that are located far away from the production floor. Ⅰ type of discharge is characterized by high intensity, long duration. Class II discharge is usually sudden, so more dangerous. When gas is ejected, not only the local accumulation of biogas can be formed, but also the partial roadway, the mining area and even the coal mine wing may be filled with gas. Mines with gas blowout hazards are super gas mines regardless of their relative biogas content.