大倾角突出煤层群岩层高位中小钻孔瓦斯抽采技术

On Gas Drainage Technology of High and Medium-sized Boreholes in Large Inclined Angle Outburst Coal Seam Group

大倾角突出煤层群保护层工作面开采过程中出现的保护层工作面上隅角瓦斯超限问题和被保护层瓦斯抽采难题亟待解决.以矿压理论为基础,研究了保护层工作面顶板“三带”的合理高度,提出了大倾角突出煤层群保护层工作面顶板岩层裂隙带高位中小钻孔瓦斯抽采技术,通过湖南煤业集团蛇形山煤矿2344工作面研究结果表明,该技术提高了瓦斯抽采量和瓦斯抽采浓度,解决了保护层工作面上隅角瓦斯超限问题,同时又拦截了被保护层涌出的瓦斯,为类似煤层瓦斯抽采提供了理论和实践依据.

It is urgent to solve the problem of gas overlimit in the corner of the protective working surface and the difficult problem of gas extraction in the protected layer.On the basis of mine pressure theory,this paper studies the reasonable protective layer working face roof height of the"three zones",puts forward the coal seams group of protection layer of large dip angle working face roof strata small borehole fissure zone high gas extraction technology.Taking the Hunan Coal Group Shexingshan coal mine 2344 working face as an example,the research results show that this technology can improve the gas drainage and concentration of the gas extraction,and solve the problem of the protective work top corner gas overrun,stopped by protection layer of the gas again at the same time,and provides the basis in theory and practice for the similar coal seam gas extraction.