在山岭隧道施工中，二次衬砌混凝土裂缝成为带有一定普遍性的质量问题。
In the mountain tunnel construction, the secondary lining concrete crack is a certain universal quality problem.
本文的主要研究内容为隧道二次衬砌混凝土配合比优化设计及其结构内力分析。
The main studying contents of this thesis are optimization-design of the mixture ratio of tunnel's secondary lining concrete and internal structural analysis.
摘要：分析了青岛地铁3号线所在地域的环境作用，并对地铁二次衬砌混凝土的耐久性进行研究。
Abstract: the environmental effects are analyzed and the secondary lining concrete durability is studied in the design for Qingdao Metro Line 3.
摘要：分析了青岛地铁3号线所在地域的环境作用，并对地铁二次衬砌混凝土的耐久性进行研究。
Abstract: the environmental effects are analyzed and the secondary lining concrete durability is studied in the design for Qingdao Metro Line 3.
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