We excavated the mountain for a tunnel.
我们开山凿洞，修建隧道。
Tunnel in hard rock may be excavated in whole section by using chiseling rock trolley to drill small holes.
在硬岩中中隧道可采用凿岩台车钻眼，进行全断面开挖。
The diversion tunnel of Geheyan Project on the Qingjiang river is one of successfully excavated large-scale underground cavities in the carbonate rock regions in China at present.
清江隔河岩水利枢纽导流隧洞是我国目前在碳酸盐岩地区开挖大跨度地下洞室的成功工程之一。
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