麦捷煤矿回采期间顶板裂隙发育规律及瓦斯治理应用研究

Development Law of Roof Fissure and Application of Gas Control during Mining in Maijie Coal Mine

为有效改善软弱煤层工作面瓦斯治理情况,以麦捷煤矿150508采煤工作面为研究对象,采用数值模拟、理论计算和现场实践相结合的方法,对工作面回采期间的围岩裂隙发育和瓦斯治理模式进行研究,提出了“高抽巷-顶板裂隙孔-风排瓦斯”的治理模式。利用数值模拟方法,对顶板裂隙钻孔施工参数和高抽巷布置层位进行了优化设计,并进行现场应用考察。结果表明:煤层冒落带发育高度为16.8 m,裂隙带发育高度为54.5 m;高抽巷最佳布置层位为16.8~35.6 m,顶板裂隙孔布置层位为20~40 m。在“高抽巷-顶板裂隙孔-风排瓦斯”的治理模式下,上隅角瓦斯体积分数平均为0.26%,工作面瓦斯抽排率平均为64%,瓦斯治理达到预期目标,保障了工作面安全回采。

To effectively improve the gas control in the working face of soft coal seams,taking No.150508 working face in Maijie Coal Mine as the research background,numerical simulation,theoretical calculation,and on-site application were combined to study the fissure development of surrounding rock and gas control model during the mining of the working face to propose a control model of“high drainage roadway+roof fissure holes+ventilation air methane”.We used numerical simulation to optimize the construction parameters of roof fissure drilling and high drainage roadway layout levels and then conducted on-site application research.The results show that the development height of the caving zone and the fissure zone is 16.8 m and 54.5 m,respectively;the optimal arrangement layer for high drainage roadway and roof fissure ranges from 16.8 to 35.6 m and from 20 to 40 m,respectively;under the control model of“high drainage roadway+roof fissure hole+ventilation air methane”,the average volume fraction of gas in the upper corner is 0.26%and average gas drainage rate in the working face is 64%.The gas control has reached the expected goal,ensuring safe mining.