3) Unstable drift
不稳固巷道
4) unstable ore-bearing rocks
不稳固矿岩
5) unstable rock mass
不稳固岩体
1.
During the development of tunnel drivage of many domestic gold mine such as Jiaojia Gold Mine in Shandong Province, encountered a lot of unstable rock mass, The rock mass is mainly disruption and alteration granite, Rock s structure growth and many crevasse surface, and rugged coefficient is f=4～5, It belongs to IV kide unstable wall rock.
在国内许多诸如山东省焦家金矿开拓巷道掘进中,遇到了大量不稳固岩体,岩体主要以碎裂蚀变花岗岩为主,结构发育,裂隙面多,坚固性系数f=4～5,属于Ⅳ类不稳固围岩。
6) poor roof
不稳固顶板
补充资料：稳固
①安稳坚牢：基础稳固｜阵地稳固｜政权稳固｜地位稳固。②巩固：稳固政权｜稳固地基。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条