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结合南京南站电缆隧道工程沉井施工过程中遇到的难点,首先介绍了采取的施工方案,然后利用有限元方法分析了沉井施工对邻近高铁桥基的影响,为安全施工提供理论依据。在此基础上,进一步分析了沉井的长宽比、面积比及下沉深度对周边土体和邻近高铁桥基的影响规律。桥基的监测数据表明,沉井施工未对桥基造成影响,同时也证明了有限元分析结果的正确性。根据有限元分析结果和现场监测数据,泥质砂岩地质条件下,沉井下沉对周边土体竖向位移的影响范围为1倍下沉深度。另外,若沉井底标高低于高铁桥基桩底标高,沉井下沉势必影响桥基稳定,必须采取相应加固措施确保桥基的安全。
Combined with the difficulties encountered in the construction of Nanjing South Station cable tunnel project during caisson construction, firstly, the construction scheme is introduced, and then the influence of caisson construction on the abutment of high-speed railway bridge is analyzed by finite element method to provide a theoretical basis for safe construction. On this basis, further analysis of the caisson’s aspect ratio, area ratio and depth of the surrounding soil and adjacent high-speed railway bridge foundation rule. The monitoring data of the bridge foundation shows that the construction of the caisson does not affect the abutment, and the correctness of the finite element analysis is also proved. According to the results of finite element analysis and on-site monitoring data, under the condition of shaly sandstone, the influence range of sunk shaft sinking to the vertical displacement of surrounding soil is 1 times sinking depth. In addition, if the elevation of the caisson is lower than the elevation of the foundation of the high-speed railway bridge foundation, the settlement of the caisson will inevitably affect the stability of the abutment. Corresponding reinforcement measures must be taken to ensure the safety of the abutment.