The practice of bolt support in reserved coal drift in mining pressure area is introduced, helpful conclusion is obtained through observation and analyse.

介绍了煤巷锚杆支护在动压区留巷的实践，并通过观测及数据分析，得出了有借鉴意义的结论。

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The excavation sequence is the key to the roadway stability in long-span full coal drift.

大跨度全煤巷道开挖顺序是关系到巷道稳定性的关键。

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So we construct for the background by the Second Shizuishan Mining, tunneling of the coal road and rock drift, carried on research to single tunneling technique of the horizontal tunnel.

本文以石嘴山二矿煤、岩巷的掘进施工为背景，对水平巷道单巷掘进技术进行了研究。

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Two more men escaped unaided from the drift mine - a mine cut into the side of a hill where the coal seam is accessed horizontally - before emergency services arrived.

BBC: Trapped miners: Bid to rescue men in Swansea Valley

It is a small drift mine - a mine cut into the side of a hill, where the coal seam is accessed by walking in.

BBC: Welsh mine rescue: Third Gleision miner found dead