极薄煤层采空区瓦斯治理试验研究

Experimental study of controlling gas in goaf of extreme thin coal seam

根据矿山压力分布规律,并结合后山煤矿实例,采用增大风量、设瓦斯专用排放巷、采空区埋管和高位钻孔抽放瓦斯等多项试验,研究极薄煤层采空区瓦斯治理.试验结果表明高位钻孔抽放瓦斯方法较好,能使瓦斯浓度降至1%以下.高位钻孔抽放瓦斯试验研究发现:钻孔内瓦斯浓度变化具有先缓慢上升,到最大值后趋于稳定,最后再下降的规律;钻孔有效长度与顶板来压有关.

According to the underground pressure distribution rule and an example of Houshan coal mine, this paper studied of controlling gas in goaf of extreme thin coal seam with increasing flux of wind, designing emission roadway special for controlling gas, arranging pipeline gas drainage method and high level borehole drilling to extract gas. The high level borehole drilling can make gas concentration to reduce less than 1%, and is a better method than other ones. Also, the change law of gas concentration in borehole initially increases slowly to the maximum value, then goes stable, and finally decreases, in the test of high level borehole drilling to extract gas. The effective length of borehole is related to roof weighting.