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为了解远程卸压开采中的瓦斯抽采特征及裂隙演化过程,以朱集矿首采工作面综合抽采为例,对比分析了各措施抽采参数变化规律。研究结果表明:留巷埋管和地面钻井抽采瓦斯浓度较高,穿层钻孔因顶板运动可能造成钻孔错断,尚不能准确实现远程定点抽采,各孔瓦斯抽采纯量和浓度差异较大,在钻孔布位和维护方面仍有较大的优化空间。运用UDEC软件模拟了采动裂隙的演化进程,模拟结果与瓦斯抽采参数的监测结果和来压规律较为吻合,可辅助查明留巷内穿层钻孔的损毁原因。
In order to understand the characteristics of gas drainage and the evolution of fissures in the long-range pressure relief mining, taking the comprehensive mining of the first mining face in Zhuji as an example, the changing regularities of the pumping parameters of each measure are comparatively analyzed. The results show that the concentration of gas in underground retaining pipe and ground drilling is high, and drilling holes may be caused due to roof movement due to perforated drilling. Remote fixed-point extraction can not be realized accurately. The pure gas and concentration of gas drainage in each hole The difference is bigger, and there is still more space for optimization in the layout and maintenance of drilling holes. UDEC software is used to simulate the evolution process of mining fractures. The simulation results are in good agreement with the monitoring results of gas drainage parameters and the pressure law, which can assist in identifying the cause of damage to the borehole in the retaining lane.