乌达矿区近距离高瓦斯煤层群立体瓦斯治理技术研究

Research on Three-dimensional Gas Control Technology for Short-interval High-gassy Coal Seams Group in Wuda Mining Area

针对乌达矿区近距离高瓦斯煤层群的具体条件,在对9#煤层开采底板破裂规律、顶板"三带"数值模拟、工作面瓦斯涌出等方面进行分析和研究的基础上,根据各矿井瓦斯治理装备的配备情况,提出工作面走向顺层长钻孔预抽、卸压拦截抽采、顶板走向高位水平长钻孔抽采、风巷机巷上向钻孔抽采,以及上隅角埋管抽采的立体瓦斯治理技术方案,现场应用表明,回风瓦斯体积分数约为0.30%,上隅角瓦斯体积分数约为0.45%,解决了该矿区9#和10#煤层开采时的瓦斯超限问题。

To counter the specific conditions of the short-interval high-gassy coal seam group in Wuda Mining Area, analysis and study were carried out on the floor fracturing regularity in the mining of No. 9 seam, the numerical simulation of the three- zones in its roof and the gas emission in the working face. Based on the allocation of the gas control equipment in the mine, a three-dimensional gas control technology was proposed, including the gas pre-drainage by long boreholes along working face strike, gas drainage by pressure relief and intercept boreholes, gas drainage by high-location horizontal long-holes along roof strike, gas drainage by upward boreholes in the air gate and conveyor gate as well as gas drainage by the buried pipes in the upper corner. The site application showed that the gas volume fraction in the air return and the upper comer was respectively about 0. 30% and 0.45% , the gas overrun problem in the mining of No. 9 and 10 seams in this coal mining area was thus solved.