Karst disaster is one of the familiar geology disasters in tunnel construction of mountain area.
我国是一个多山、多岩溶地貌国家，岩溶问题是山区隧道建设中的关键问题之一。
The tunnel engineering has always been troubled by the karst issue.
岩溶问题始终是困扰隧道工程界的一个大难题。
The tunnel engineering has always been troubled by the karst issue.
岩溶问题始终是困扰隧道工程界的一个大难题。
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