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为提高近距离煤层群下保护层开采上部邻近煤层卸压瓦斯抽采效果,减小工作面瓦斯涌出量,应用高抽巷巷内布置的上向钻孔抽采邻近煤层卸压瓦斯。探讨了该方法的原理和相关工艺,并在贵州盘江精煤股份有限公司金佳矿进行了试验。结果表明,高抽巷巷内布置的上向钻孔能够有效地抽采上部煤层的卸压瓦斯,提高抽采效果;在下保护层工作面开采早期,上向钻孔抽采瓦斯量小且浓度较低,中期抽采效果好,后期抽采效果逐渐变差。
In order to improve the effect of relieving gas drainage in the adjacent coal seams above the upper protective seam in the close distance coal seam and reduce the gas emission in the working face, The principle and related technology of the method were discussed. The experiment was carried out in Jinjia Mine of Panjiang Coal Company Limited. The results show that the uphole drilling arranged in the high alluviation lane can effectively extract the pressure relief gas in the upper coal seam and improve the pumping effect. In the early mining of the lower capping face, the amount of gas drainage from the upper borehole is small and the concentration Lower, medium-term pumping effect is good, the late pumping effect gradually worsened.