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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 pressure distribution law of mine and the case of Hou Shan Coal Mine, a number of experiments such as increasing wind volume, setting gas drainage lane, mined-out area and high-level borehole drainage gas are used to study gas control in goaf of very thin coal seam The test results show that the method of gas drainage by high-level drilling is better, and the gas concentration can be reduced to less than 1% .According to the experiment of gas drainage in high-level boreholes, the gas concentration in boreholes increases slowly and reaches the maximum In the stable, and then the law and then decline; effective length of drilling and roof pressure.