复杂条件下城市过河隧道结构方案研究

以上海市某过河隧道为例，综合考虑充分利用地下空间、发挥道路交通功能、保护周边环境等因素，对隧道过河的明挖、暗挖方案进行深入对比，确定了明挖叠层结构方案，结合围堰分幅施工；同时根据周边环境条件，采用合理的基坑支护体系，对基坑开挖施工进行了全过程数值模拟。结果表明，开挖对周边环境的影响满足规范要求。

Study on Structure Scheme of Urban River-crossing Tunnel under Complicated Conditions

Taking a river-crossing tunnel in Shanghai as an example, the factors of fully using the underground space, playing the function of road traffic and protecting the surrounding environment are comprehensively considered. The open and underground excavation schemes of river-crossing tunnel are further compared. The open excavation scheme of laminated structure is determined. Its construction is combined with the cofferdam by frames. According to the surrounding environmental conditions, a reasonable support system is adopted for the foundation pit, and the whole process of foundation pit excavation is simulated numerically. The results show that the influence of excavation on the surrounding environment meets the requirements of the code.