With mining tunnel as the studied object, the stability of surrounding rock and its supporting design are studied in the paper.

本文以矿山回采巷道为主要研究对象，对巷道围岩的稳定性及其支护设计进行了研究。

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Many of these mining engineers have already worked on projects like the Channel Tunnel and the Jubilee line extension so they're not easily impressed.

BBC: Crossrail: Passion deep below west London

Mining firm Freeport said at least four miners were rescued at its Grasberg mine after an underground tunnel collapsed early on Tuesday.

BBC: Freeport's Grasberg copper mine