高瓦斯厚煤层采动裂隙发育区瓦斯抽采技术

Gas Drainage Technology of Mining Fracture Developed Zone in High Gassy and Thick Seam

针对高瓦斯厚煤层开采过程中采动裂隙发育区瓦斯涌出量大的问题,通过现场观测得知采空区瓦斯和邻近层瓦斯占工作面全部涌出瓦斯的50%以上,并确定了工作面裂隙带高为15.68～28.68m。基于此,提出了在传统本煤层瓦斯抽采和邻近层瓦斯抽采的基础上,在采动裂隙发育区采用高位钻孔抽采瓦斯的方法进行瓦斯抽采,并确定了瓦斯抽采的相关参数。实践表明:裂隙带邻近层高位钻孔瓦斯抽采效率大于本煤层瓦斯抽采和单纯邻近层瓦斯抽采效率,工作面瓦斯抽采率达53%。

According to the high gas emission from the mining fracture developed zone during the mining process of high gassy and thick seam, the site observation showed the gas in the goal and the gas in the neighboring seams would be taken over 50% of the total emission gas in the coal mining face and the height of the crack zone in the coal mining face was 15.68- 28.68 m.Based on the circumstances, based on the traditional gas drainage in the mining seam and the gas drainage from the neighboring seam, the high level borehole gas drainage method was applied to the gas drainage in the mining crack development zone.The related parameters of the gas drainage were determined. The practices showed the high level borehole gas drainage effect in the neighboring seam of the crack zone was higher than the gas drainage in the mining seam and the gas drainage effect of the single neighboring seam and the gas drainage rate of the coal mining face was 53%.