大直径拐弯钻孔替代倾斜高抽巷抽放瓦斯的可行性研究

Feasibility Research on Gas Drainage by Large Diameter Bend Borehole Replacing Tunnel

在阳泉矿区进行了替代倾斜高抽巷的大直径拐弯钻孔施工工艺的研究,共完成6个试验孔,试验孔造斜段平均弯曲强度达到1·2°/m,钻孔总进尺378·55m。经过瓦斯抽放效果的监测与对比,大直径拐弯钻孔的瓦斯抽放效果接近于倾斜高抽巷,论证了大直径拐弯钻孔替代倾斜高抽巷抽放瓦斯的可行性。

Drilling techniques of large diameter bend borehole which was the replacement of slant tunnel for gas discharge were researched in Yangquan. Total six test boreholes were drilled. The average deflecting intensity of bend borehole was up to 1.2°/m. The total depth of six boreholes was up to 378.55 m. The result comparison shown that the gas discharge effects were nearly the same by large diameter bend boreholes and tunnel. Therefore the possibility of using large diameter borehole to replace slant tunnel was possible.