矿山爆破工作是瓦斯形成的主要来源。尤其是大爆破时有大量有毒瓦斯产生。众所周知,爆破抛出的瓦斯大部分沿矿山坑道经竖井及平硐排至地表,在那里与大气混合并稀释到安全浓度。同时,相当数量的有毒瓦斯长时间地存在于矿内空气中。大爆破时在爆破当时多半使主扇暂停,过了10～15min(或者迟得多)以后才开动 Mine blasting is the main source of gas formation. In particular, when there is a large number of large-scale production of toxic gas. It is well known that most of the gas thrown out by blasting is drained to the surface of the earth along shafts and pits along the mine tunnel where it is mixed with the atmosphere and diluted to a safe concentration. At the same time, a considerable amount of toxic gas exists in the mine air for a long time. Big blast in the blast when most of the main fan to suspend, after 10 ~ 15min (or much later) before starting