所得出的钻孔破坏半径的表达式可用于不同条件下计算瓦斯排放钻孔的有效排放半径和卸压钻孔的有效卸压半径。
Sequentially, the effective radius of gas extraction and the effective pressure-released radius of pressure-released borehole are calculated by the borehole destroying radius expressions.
现场考察了淮南矿区掘进巷道瓦斯排放的基本参数，确定了巷帮钻孔的有效布置范围和合理抽放时间。
On-the-spot investigation was made on the basic parameters of gas drainage in drivage roadway in Huainan Coal Mining Area, and reasonable arrangement range of rib bore-holes an...
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