黏性土地区高速铁路桥梁桩基础沉降计算方法研究

Research on Calculation Method of Bridge Pile Foundation Settlement of High-speed Railway in Cohesive Soil Area

为了解决黏性土地区高速铁路桥梁桩基础沉降计算中工后沉降占总沉降的比重、基础压缩层厚度的确定、沉降随时间和荷载的变化曲线等问题,针对已通车客运专线的大量测量和试验数据,采用数理统计并结合现场试验的方法,对高速铁路黏性土地区桥梁基础沉降计算方法进行深入的研究,得出工后沉降占总沉降比重不超过55%、沉降随时间和荷载的变化采用变形过程指数法进行计算等十分重要的结论。

The purpose of this research is to solve the problems in the settlement calculation of bridge pile foundation of high-speed railway in cohesive soil area, such as the proportion of the post-construction settlement in the total settlement, the compressive layer thickness, the settlement variation with the load and time variation and so on. Base on lots of experimental data and measurement data from the passenger dedicated line in operation, and using mathematical statistics and test in-situ method, a further research on the bridge pile foundation settlement of high-speed railway in cohesive soil area was carried out by the authors. The important conclusions from this research are as follows： the proportion of the post- construction settlement in the total settlement should not be larger than 55% ; and the calculation of the settlement variation with the load and time variation may adopt the deformation process index method.