南煤集团12^(#)煤层开采上邻近层瓦斯治理技术

Gas Control Technology of Upper Adjacent Layer in the 12^(#)Coal Seam of Nanmei Group

为解决12^(#)煤层回采期间上邻近层瓦斯涌出量大的问题,采用数值模拟分析上邻近层瓦斯运移规律,得出上邻近层瓦斯会分别在10^(#)、11^(#)煤层和9^(#)煤层附近形成低位和高位瓦斯富集区,基于模拟结果设计上邻近层瓦斯治理采用高位+低位钻孔联合抽采的方式。结果表明:抽采方案实施后,瓦斯抽采率在85%以上,回采期间无瓦斯超限现象。

In order to solve the problem of large gas emission from the upper adjacent layer during the mining of 12^(#)coal seam,numerical simulation is used to analyze the gas migration law of the upper adjacent layer,it can be concluded that gas in the upper adjacent layer will form low and high gas rich areas near the 10^(#),11^(#)and 9^(#)coal seams,respectively,based on the simulation results,the gas treatment of the upper adjacent layer is designed to adopt the combination of high+low drilling and extraction.The results show that after the implementation of the extraction scheme,the gas extraction rate is more than 85%,and there is no gas exceedance phenomenon during the mining period.