隧;
The development systems are the adit and pass above 4100 m level, and underground shaft under 4100 m.
4100m以上选用平硐溜井开拓系统, 4100m以下选用盲竖井开拓系统.
When she had made a hole in the entrance she tried to pass through it. Stability analysis of the side slope in the portal section of tunnel with semi-open and semi-underground method
他在洞口上打开了一个洞,就想从里边钻出来。半明半暗法隧道进洞洞口段边坡稳定性研究
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