This paper mainly researches on the technique of draining long distance pressure relief gas in bed plate tunnel under the circumstance of mining protective coal seam.
本论文主要是针对远程下保护层开采条件下，对底抽巷上向穿层钻孔抽放远程卸压瓦斯技术进行了深入的研究。
According to the permeating theory of the underground water, the principle of preventing the subsurface water draining is put forward for tunnel analyzed.
根据渗流计算的原理分析了“灌浆封堵”外水压力的作用机理。
According to the permeating theory of the underground water, the principle of preventing the subsurface water draining is put forward for tunnel analyzed.
根据渗流计算的原理分析了“灌浆封堵”外水压力的作用机理。
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