...高位排水；掌子面稳定性 中图分类号：U 455 文献标识码：A [gap=1628]Key words: fault; water-rich; mountain tunnel; high-position drainage; working face stability ...
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It proved that gas drainage with high position bores and elevation bores can both reduce laneway digging work and get fairly good gas extracting result.
实践表明高位抽放与仰角抽放方法相结合，既可减少钻场施工，又有较好的抽放效果。
High position bores and elevation bores methane drainage technique can prevent gas problem successfully.
采用高位钻孔和仰角钻孔抽放瓦斯技术，有效地防止了瓦斯超限。
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