某公路扩建工程对高铁桥墩桩基的影响分析

Effect of road reconstruction on piles foundation of high-speed railways

公路的新建或者扩建工程对周围已建工程的影响是一项关键的技术问题。针对苏州相城大道扩建工程下穿京沪高铁工程,应用有限单元法建立高铁群桩和公路群桩整体三维有限元模型,考虑了完整的施工步骤和运营期荷载,以高铁桥墩桩基侧摩阻力、轴力、桩身侧向变形为研究对象,对比分析了两种施工方案对高铁桥墩桩基的影响,揭示该扩建工程对高铁桩基的影响规律,为完善设计和施工方案提供了技术支持,并为类似问题的研究提供了参考。

The effect of the reconstructed highways on the existing nearby projects is a critical technical issue. Aiming at the extension project of Xiangcheng highway in Suzhou which crosses under Beijing-Shanghai high-speed railway, a three-dimensional model for the high-speed railway pile groups and highway pile groups is established, and then FEM is used to analyze this problem. The complete constructing procedure and the operation period loads are considered. The negative friction, axial force and lateral deformation of high-speed railway piles are taken as the research subjects, and the pattern and magnitude of the effects on the high-speed railway piles are revealed thoroughly. Two construction schemes of pile groups in the highway are compared. It may provide technical support for the optimization of the design plan and the construction scheme of the pile groups in highway and reference for the similar projects.