long hole gas drainage 走向长钻孔抽放
According to seepage theory, the gas seepage from drainage hole along coal seam is studied by means of electrical simulation experiment.
根据渗流理论，本文对沿层抽放钻孔周围的瓦斯渗流问题进行了电模拟实验研究。
The hole enlargement by high - pressure water jet provided a feasible technical way for raising gas drainage effect from coal seam in low permeability and improving the effect of outburst pre...
高压水射流扩孔为提高低透气性煤层的瓦斯抽放效果和扩大防突措施的效果提供了一个可行的技术途径。
Based on engineering experience and combined with presently hole-sealed technology of gas drainage used in Tunlan mine, the reasonable hole-sealed length was determined by theoretical analysis.
以工程实验为基础，结合屯兰矿现有瓦斯抽放中封孔工艺，主要针对封孔长度，通过理论分析，确定合理的封孔长度。
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