用桩加固浅基础的力学模型研究

Researches on the mechanical model of the shallow foundation reinforcement by pile-foundation

对用桩加固既有铁路桥梁中浅基础常用计算方法进行比较,认为此类结构应考虑承台结构的变形,并提出了合乎实际情况的力学模型。实例计算与比较分析结果表明,由于用桩加固浅基础时其承台结构的特殊性,竖向荷载对桩身弯矩有较大影响。此外,给出了考虑承台变形和竖向荷载的影响时,浅基础用桩加固的力学模型计算公式。

Comparison of common methods of the shallow foundation reinfowement by pile-foundation in the existed railway bridges was carried out, and a mechanical model which was consistent with the practical condition was presented. Calculation formula on the mechanical model with the consideration of the platform deformation and the influence of vertical load were given. The result shows that the platform deformation in this kind of structures should be considered. There is a significant effect of vertical load on the bending moment of the piles due to the particularities of the reinforcement by pile - foundation.