摘要
高瓦斯煤层回采过程中,采场覆岩层的卸压瓦斯会大量突然涌入工作面,导致瓦斯频繁超限,给矿井安全生产造成严重的威胁。针对该问题,以南庄煤矿12#煤层及其围岩地质条件为研究背景,利用理论分析与数值模拟相结合的方法,确定了采场覆岩层冒落带与裂隙带高度,并在此基础上提出一套高位钻孔瓦斯抽采工艺。现场试验表明高位瓦斯抽采钻孔瓦斯流量达到了80m3/min以上,浓度达到了60%以上,比副巷钻孔的50m3/min和30%分别提高了60%和100%;抽采效果明显提高,矿井安全生产得到了进一步的保障。
In the mining process of the high gassy coal seam,the unloading gas in the overlying strata will suddenly flood into the working face,causing the gas to exceed the limit frequently,which could pose a serious threat to the safe production in the mine.Accordingly,taking the No.12 coal seam and surrounding rock inNanzhuang Coal Mine as the research background,theoretical analysis and numerical simulationwereused to determine the height of the caving zone and fracture zone of the overlying strata in the stope.Based on this,a set of high position borehole gas drainage techniques are proposed.The field test shows that the gas flow rate of the high position gas drillingis more than 80 m^3/min and the concentration is more than 60%,60% and 100% higher than the auxiliary roadway drilling respectively(50 m^3/min and 30%);the gas drainage effect has been significantly improved,which guarantee the mine safety production.
作者
白庆华
BAI Qinghua(Dayangquan Coal Co.,Ltd.,Yangquan 045000,China)
出处
《山西煤炭》
2019年第1期77-80,共4页
Shanxi Coal
关键词
高位钻孔
瓦斯抽采
裂隙带
瓦斯涌出
high position drilling
gas drainage
fracture zone
gas emission
