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为解决低瓦斯含量煤层在超高强度开采工艺下,U型通风回采面割煤期间瓦斯涌出量突增、采空区持续高瓦斯涌出以及上隅角瓦斯频繁超限等问题,在确认瓦斯异常涌出原因基础上,以塔山煤矿为例,研究煤层注水抑制落煤瓦斯涌出和专用巷分期排抽采空区瓦斯联合防治技术。结果表明,煤层注水消除了割煤期间瓦斯突增现象——回风流中最大瓦斯体积分数仅0.58%;在开采初期瓦斯专用巷自然引排使回采面形成U+I型通风方式,分担风排瓦斯量约30 m~3/min,在开采中、后期的密闭负压抽采,瓦斯排放量提升至40 m~3/min。采用该技术,已将回采期间的工作面瓦斯体积分数有效控制在0.6%以下,实现安全高效开采。
In order to solve the problems of low gas content coal seam under ultra-high strength mining technology, sudden increase of gas emission during coal cutting in U-shaped ventilation mining face, continuous high gas emission in goaf and frequent gas overhang in upper corner, Based on the reason of abnormal gas emission, taking Tashan Coal Mine as an example, this paper studies the coal seam water injection to suppress the gas emission of falling coal and the joint prevention and control technology of gas drainage in special alley with staged drainage. The results show that the injection of coal seam eliminates the phenomenon of gas sudden surge during coal cutting - the maximum gas volume fraction in the return air flow is only 0.58%. In the initial mining, the natural gas drainage of exclusive roadway causes the mining face to form U + I ventilation mode, The gas volume is about 30 m ~ 3 / min. During the mining, the closed negative pressure is extracted and the gas emission is increased to 40 m ~ 3 / min. With this technology, the gas volume fraction of the working face during the recovery period has been effectively controlled below 0.6%, achieving safe and efficient mining.