实体基础Mindlin方法在高铁路基沉降分析中的应用研究

为解决刚性桩复合地基形式的高速铁路路基沉降变形分析问题，系统研究了实体基础Mindlin方法应用于高铁路基沉降评估的相关思路和关键技术问题。结果表明:高铁路基加固区压缩变形相对较小，可等效为刚性实体基础并将路基荷载传递和转移至加固区周边地基，加固区边界位置处等效荷载可分别通过Boussinesq方法和竖向力平衡方法确定；通过Mindlin点荷载附加应力叠加方法，能够实现地基内部任意位置处附加应力计算，分析结果同数值仿真模拟基本相同。

Research on the Application of the Physical Foundation Mindlin Method in the Settlement Analysis of High-speed Railway Subgrade

In order to solve the problem of settlement and deformation analysis of high-speed railway subgrade in the form of rigid pile composite foundation, the related thinking and key technical problems of applying the physical foundation Mindlin method to settlement evaluation of high-speed railway subgrade were studied systematically. The results show that the compression deformation of the strengthened area of high-speed railway subgrade is relatively small, which can be equivalent to the rigid solid foundation and transfer the subgrade load to the foundation around the strengthened area. The equivalent load at the boundary of the strengthened area can be determined by Boussinesq method and vertical force balance method respectively. Through the Mindlin point load additional stress superposition method, additional stress calculation can be realized at any position inside the foundation, and the analysis results are basically the same as the numerical simulation model.