Abstract:The ongoing reconstruction project of Tongxing intersection in Guzhen of Qijiang highway on Zhongshan provincial highway S268 plans to transform an existing level crossing into a diamond interchange with an east-west main line crossing under the north-south road and an east-west road crossing the north-south road. The U-shaped groove section of the main line crosses under the viaduct of railway at 36 °, the distance between the U-shaped groove foundation pit and the nearest plane of the railway bearing platform is about 4m, and the deepest excavation depth of the affected section is 5.1m. In the design stage of the project, three-dimensional numerical calculation and analysis were carried out on the impact of U-groove foundation pit excavation on the displacement of adjacent railway bridges. The relevant calculation report documents have been reviewed and approved by Guangzhou Railway Group, and the project has been successfully carried out. This paper reviews the completed numerical calculation and analysis, and focuses on the key points and precautions in the three-dimensional calculation process of this project, in order to provide a useful reference for similar projects.
