深井煤层群首采层Y型通风工作面采空区卸压瓦斯抽采与综合治理研究

Relieved gas drainage and comprehensive control in gob of Y-type coal face in the first coal seam mining of deep multi-seams

以朱集煤矿1111（1）工作面为例,针对深井高瓦斯低透气性煤层群首采层开采卸压瓦斯治理难题,将Y型通风工作面采空区瓦斯运移规律与采空区内部空隙储存卸压瓦斯的优势相结合,提出并实施了强化留巷墙体封闭和Y型通风工作面留巷段采空区卸压瓦斯抽采技术,结合地面钻井抽采采动上部卸压煤层瓦斯,实现了深井煤层群首采层工作面的安全高效回采。1111（1）工作面回采期间,绝对瓦斯涌出量最大72.39 m3/min,平均为43.64 m3/min,在工作面风量2 290~2 700 m3/min条件下,回风流瓦斯体积分数0.6%以下,平均瓦斯抽采量34.27 m3/min,其中埋管抽采瓦斯纯量平均为21.94 m3/min,占瓦斯抽采总量的64%,工作面回采期间瓦斯平均抽采率为78%,研究成果为今后类似深井煤层群首采层开采的卸压瓦斯抽采和治理提供技术指导。

In this paper, in view of the difficulties of relieved gas control in the first coal seam mining of the deep multiseams with high gas and low permeability, taking Coal Face 11 l 1（1） in Zhuji Coal Mine as example, we provided and implemented the technique to strengthen the wall closeness of gob remained entry, and the gob relieved gas drainage technique in the gob remained entry of Y-type ventila- tion coal face, with the combination of gob gas delivery law in Y-type coal face and the advantage of accumulated relieved gas withtin the gob. In addition, combined with the gas drainage in the upper re- lieved coal seam by the surface well drilling, the safety and high efficiency mining in the first coal seamin of deep multiseams was realized. The results show that the maximal and average absolute gas emission quantity is 72.39 m3/min and 43.64 m3/min, respectively. When the air volume in the face is 2 290-2 700 m3/min, and the gas concentration in the return airflow is less than 0.6%, the average gas drainage volume is 34.27 m3/min, where the average gas drainage volume in buried pipes is about 21.94 m3/min, which is 64% of the total gas drainage volume. Moreover, the average gas drainage rate is about 78% during the mining process. The research achievement can provide the basis for gas drainage and control in the first coal seam mining of similar deep multiseams in the future.