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Tunnel portal is principal part of tunnel structure, it's safety should not be ignored. "
隧道洞门结构是隧道工程主体结构的组成部分,隧道洞门结构的安全问题不容忽视.
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The difficulty also becomes greater. The depth of embedment at the tunnel portal is shallow.
隧道的长度、断面都是空前的,难度也大于以前.
隧道洞门???
[隧道]洞门???
洞门???
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