Abstract Blasting is still the key mining method in china ′ s coal mines at present. Outburst induced by blasting amounts to more than 2 / 3 of the total mumber of outburst. 目前放炮作业仍是我国煤矿采掘工作面的主要落煤方法,放炮时发生的突出占突出总数的2/3以上。
Coal and gad outburst is one of most serious natural disasters that threaten coal mine safe product, while the number of coal and gas outburst in advancing coal way accounts for the top of the total number of coal and gas outburst in coal mines. 煤与瓦斯突出是威胁煤矿安全生产的严重自然灾害之一,而煤巷掘进时期发生的煤与瓦斯突出次数占矿井突出总次数的首位。
Now most state-owned coal mines are gas mines, which have 44 percent in the total of the national mine including gas outburst mines and high concentration gas mines. Gas explosion has a large proportion at serious accident in coal mines. 目前国有重点煤矿大多属于瓦斯矿井,其中高瓦斯矿井和突出矿井占全国矿井总数的44%。瓦斯爆炸事故在煤矿重大事故中占有很大的比重。