Inadequate technology in tunnel excavation shall result in instability of surrounding rocks and even lead to collapse and failure of them and cause unrecoverable loss of economy and time.
隧洞施工工艺选择不当，易造成围岩失稳甚至大塌方，给工程带来不可弥补的经济和时间损失。
Inadequate technology in tunnel excavation shall result in instability of surrounding rocks and even lead to collapse and failure of them and cause unrecoverable loss of economy and time.
隧洞施工工艺选择不当，易造成围岩失稳甚至大塌方，给工程带来不可弥补的经济和时间损失。
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