rock surrounding a tunnel

• 隧道围岩

rock surrounding a tunnel的用法和样例：

例句

1. The classification of rock masses is in the base of tunnel design and construction.
   隧道围岩地质类别的判别是进行隧道支护和施工的基础。
2. Long time surface water supply by permeation causes surrounding rock being saturated all the time, to soften up the rock.
   长期的地表水渗透补给导致隧道围岩一直处于饱水状态，逐渐使部分岩石软化。