基于上海软土特性的压桩试验非线性分析模拟

Analysis of Q-S Curve of Single Pile Considering Non-Linear Behavior Reaction on the Basis of Soft Soil in Shanghai

假定桩周土体为弹性半空间无限体;在桩、土之间有一层无限薄的接触面,可传递桩、土之间的剪力,认为接触面的剪力和剪切位移之间的关系是非线性的。此外,还考虑了桩底土反力的非线性,认为桩底反力与位移之间的关系亦为非线性。再根据土体-接触面-桩体系节点力的平衡条件,建立求解方程,进而可得到一条压桩曲线。最后进行了两个压桩曲线的对比,初步验证了所提出的方法用于计算单桩沉降的可行性。

In this paper, it was supposed that the soil is an elastic body in half unlimited space, and there is an interface between the soil and the pile, which can transfer shear force. The relationship of shear force and shear displacement of the interface was considered non-linearly. And the relationship of the force and the displacement of the pile bottom was considered non-linearly too. Based on the equilibrium of node force, a new method for analysis the load（Q） -settlement（S） curve of single pile was proposed. The suitability of this analysis was verified by the project in soft soil of Shanghai.