为进一步提高采空区裂隙带瓦斯抽采效果以保障工作面回采期间安全，提出了一种大直径顶板定向长钻孔（203 mm）进行采动区裂隙带瓦斯定向抽采技术，并对其施工工艺、钻孔布置合理层位及抽采效果进行了研究。结果表明，钻孔布置的合理垂直高度45～50 m，钻孔与工作面回风侧的水平间距40 m。与高抽岩巷、普通顶板高位钻孔等常规采动区瓦斯治理方法相比，大直径顶板定向长钻孔的抽采量与高抽岩巷相当，是普通顶板高位孔抽采量的2.04倍；工程量大幅度降低，大直径顶板定向长钻孔既能实现高效率抽采，又达到节约工程量、降低施工成本等效果。大直径顶板定向长钻孔的成功应用为以孔代巷及传统顶板高位孔工艺的改进提供了实践基础和发展方向。

In order to further improve gas drainage effect in the fracture zone of the gob to ensure the safety of the working face during mining, a large diameter roof directional long borehole(ø203 mm)was proposed for gas directional drainage in the fracture zone of mining area, and its construction technology, reasonable layout of drilling holes and drainage effect were studied.The results show that the reasonable vertical height of the borehole layout is 45～50 m, and the horizontal distance between the borehole and the return air lane of the mining face is 40 m.Compared with gas control methods in conventional mining areas such as high-drainage roadways and high-level boreholes, the extraction volume of large-diameter directional long bores on roof is equivalent to that of high-level extraction roadways, and it is 2.04 times of that of common roof high-level borehole; the engineering volume is greatly reduced.Large-diameter roof-oriented long drilling can not only achieve high-efficiency extraction, but also save engineering volume and reduce construction costs.The successful application of of this technology provides a practical basis and development direction for the improvement of the technology of replacing roadway with hole and the traditional high position hole in roof.