2) long hole gas drainage
走向长钻孔抽放
3) strike borehole
走向钻孔
1.
This paper has brought forward the thought of constructing strike boreholes in the roof of coal seam and their parameters design,and effectively solved the difficult problem of the upper corner?gas in working face by engineering practice,it has gained notable effectiveness.
本文通过研究受采动影响,在9~#煤综采工作面上方顶板内裂隙的生成及变化规律,提出了在顶板内施工走向钻孔及钻孔参数设计的思想,并通过工程实践,有效地解决了工作面上隅角瓦斯问题,取得了显著的效果。
4) high position boring hole
走向高位钻孔
5) roof strike drills
顶板走向钻孔
6) Parallel strike borehole
平行走向钻孔
补充资料：走向长壁采煤法
见壁式采煤法。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条