泥岩地区沉井施工对土体及高铁桥基影响研究

发布时间：2018-05-06 23:39

本文选题：泥质砂岩 + 沉井　；参考：《地下空间与工程学报》2014年04期

【摘要】：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。
[Abstract]:Combined with the difficulties encountered in the caisson construction of the cable tunnel project of Nanjing South Railway Station, this paper first introduces the construction scheme adopted, and then analyzes the influence of caisson construction on the adjacent high-speed railway bridge foundation by using finite element method, which provides a theoretical basis for safe construction. On this basis, the effects of aspect ratio, area ratio and subsidence depth of the caisson on the surrounding soil and adjacent high-speed railway bridge foundation are further analyzed. The monitoring data of the bridge foundation show that the construction of the caisson has no effect on the bridge foundation, and it also proves the correctness of the finite element analysis results. According to the results of finite element analysis and field monitoring data, under the geological conditions of argillaceous sandstone, the influence range of caisson sinking on the vertical displacement of surrounding soil is twice the depth of subsidence. In addition, if the bottom elevation of the caisson is lower than that of the pile bottom of the high-speed railway bridge, the sinking of the caisson will inevitably affect the stability of the bridge foundation, and corresponding reinforcement measures must be taken to ensure the safety of the bridge foundation.
【作者单位】：中冶天工上海十三冶建设有限公司;上海交通大学土木工程系;
【分类号】：U443.1

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