刚性承台下垫层-桩-土相互作用的近似解析法

An Approximate Analysis Method for Interactions of Cushion-Pile-Soil beneath Rigid Cap

基于桩基沉降分析中已被广泛接受的剪切位移法,考虑刚性承台下的垫层-桩-土相互作用,提出了带垫层桩体复合地基的一种近似解析方法,分析时假定垫层与承台接触紧密,根据变形协调和荷载平衡条件,可推导出了桩土分担比和基础沉降的显式解答。作者所求得的桩土荷载分担比与边界元解答具有较好的一致性,而在反映基础沉降特性的无量纲刚度上,两者还存在着一定的误差。该方法可以进一步推广用于非均质地基中的群桩沉降分析。

Based on shear - deformation method for concentric cylinder model which is widely applied in the analysis of pile foundation, an approximate method for analyzing the interactions of pile - subsoil - cushion beneath rigid cap is proposed to design the composite piled raft with cushion. In the analysis, the raft is assumed to be contacted with the cushion closely. According to the load equilibrium condition and deformation compatibility condition, the load sharing ratio of pile to subsoil and settlement of foundation can be expressed in explicit formulations. Compared with the solutions of boundary element method, the load sharing ratio of pile to subsoil is approximately equal to that obtained by the present method, while for the settlement there are some errors. The analytical method can be applied to group piles in nonhomogeneous subsoil as well.