软土地区高速铁路路桥过渡段管桩与桩帽加固施工研究

基于某沿海高速铁路采用管桩+桩帽加固路桥过渡段深厚软土路基，建立土-路基-桥台-桩基的三维有限元模型，对高铁路基加固后的桥台及台后过渡段路基的变形特性进行分析，并与实测值对比分析。结果表明：采用管桩和桩帽组成的新型结构对路基进行加固，可较好地控制桥台和路基的沉降，缩短沉降稳定时间，可用于无砟轨道路基软土地基加固。

Research on Reinforcement Construction of Pipe Pile and Pile Cap of High-speed Railway Bridge Abutment and Transition Section in Soft Soil Area

The deep soft soil subgrade in the transition section of a coastal high-speed railway bridge is reinforced with pipe piles and pile caps. A 3D finite element model of soil subgrade abutment pile foundation is established. The deformation characteristics of the bridge abutment and the subgrade at the transition section behind the abutment after the high-speed railway subgrade reinforcement are analyzed. The results show that the new structure composed of pipe piles and pile caps used for subgrade reinforcement can better control the settlement of abutment and subgrade, shorten the settlement stability time, and be used for the reinforcement of soft soil foundation of ballastless track subgrade.