黄白茨煤矿9^#、10^#近距离煤层综合瓦斯治理技术

Comprehensive gas control technology of 9^# and 10^# closed distance coal seam in Huangbaici coal mine

针对黄白茨煤矿9#和10#近距离煤层开采时的瓦斯超限问题,在分析9#煤层开采底板破裂规律、对其开采顶板三带进行数值模拟以及确定工作面瓦斯来源的基础上,提出9#煤层采前定向长钻孔预抽、开采期间顶板走向高位水平长钻孔抽采,10#煤层卸压拦截抽采、采面采掘期间上下顺槽上向钻孔抽采及两煤层采空区埋管抽采的综合瓦斯治理技术方案。效果分析结果表明,正常通风情况下,9#煤层回风巷、上隅角瓦斯体积分数分别保持在0.36%和0.50%左右。该方案有效解决了9#和10#近距离煤层开采时的瓦斯涌出问题,为类似矿井的瓦斯治理提供了参考。

Aimed at addressing gas overrun occurring during the mining period in the 9^#and 10^#closed distance seams in Huangbaici coal mine, this paper describes an analysis of the floor demolish regulars of 9^#coal seam, offers a simulation of three ceiling bands of 9^#coal seam roof and determination of the sources of working face gas, and above all, proposes a comprehensive gas control scheme dominated by pre-mining drainage with directional long borehole drilling in 9^#coal seam, drainage with roof strike high position horizontal long borehole drilling during mining, drainage with buried pipeline in the goaf and release of the pressure to intercept gas in 10^#coal seam, drainage with upward drilling hole in two cross-headings during exploiting. Results show that, in the case of the normal ventilation, gas volume fraction is kept at 0.36% and 0.50% in return airway and upper corner. The scheme proves an effective solution to gas emission occurring during 9^#and 10^#closed distance coal seam mining and serves as reference for gas control in similar mines.