高瓦斯矿井U型通风工作面瓦斯治理技术

针对李雅庄煤矿U型通风工作面上隅角及回风流瓦斯浓度高、瓦斯治理难度大的问题，根据工作面瓦斯来源及在采空区三带的运移储存规律，李雅庄煤矿开展了本煤层抽采工艺优化和裂隙带抽采技术研究。对本煤层钻孔封孔深度、联孔工艺、管路连接方式等进行优化，钻孔抽采浓度由抽采4个月后降低到9%提高到抽采10个月后维持在19%；通过调整裂隙带钻孔布置方式、优化钻孔布孔层位、采取下筛管护孔等技术措施，裂隙带钻场最高瓦斯抽采纯流量达13.6 m³/min，平均瓦斯抽采纯流量达8 m³/min，2个钻场联合抽采瓦斯纯流量在13 m³/min以上；取消了瓦斯措施巷、井下移动泵和上隅角风帘，上隅角和回风流平均瓦斯浓度分别控制在0.5%和0.4%以下，对高瓦斯矿井U型通风工作面瓦斯治理有借鉴意义。

Gas control technology of U-shaped ventilation face in high gas mine

Aiming at the problems of high gas concentration and difficult management in the upper corner of U ventilation face in high gas mine，according to the gas source of working face and the law of migration and storage in the three zones of goaf，the optimization analysis of coal seam extraction and the research of fracture zone extraction was carried out in Liyazhuang Coal Mine.Through improving the sealing depth，joint hole technology，pipeline connection mode，etc，the concentration of borehole decreased to 9% after 4 months，and increased to 19% after 10 months.By adjusting the layout of the holes in the fracture zone，optimizing the arrangement of the holes and adopting the technology of protecting the holes with the lower screen pipe，the maximum net flow of gas drainage in the drilling field of fracture zone is 13.6 m³/min，the average net flow of gas drainage is 8 m³/min，and the total net flow of gas drainage in the two drilling fields is more than 13 m³/min.The gas measure roadway，underground mobile pump and upper corner air curtain are canceled，and the average gas concentration in the upper corner and return air flow is controlled below 0.5% and 0.4% respectively.It can be used for reference in gas control of U type working face in high gassy mine.