n. tunneling
misc. tunnel work
开挖隧道会威胁到斯图加特的地下泉。
施工最困难的隧道是在一条河的下面一定深度处或水域其他部分中开挖隧道。
The most difficult tunneling is that undertaken at considerable depths below a river or other body of water.
此表达式可以更加合理的求解开挖隧道临界垮落载荷，为衡量隧道稳定提供理论依据。
The loads of tunnel critical failing model are taken into account in the formula reasonably, which is also the important theory to identify tunnel stability.
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