复合地基沉降计算新方法-桩体沉降法

通过模型试验和数值模拟对复合地基进行研究,提出了桩体沉降法计算复合地基沉降的新方法.根据对不同参数(桩长、桩径、桩体模量、褥垫层厚度、褥垫层模量、加固区土体模量、下卧层土体模量)的复合地基的分析,提出了桩体沉降法的两个重要参数:桩顶应力比和桩端应力比,并推导其经验公式.通过与工程实测对比分析表明,采用桩体沉降法计算的沉降量与实测数据相吻合,可以认为是工程设计的一种可靠方法.

New method for settlement calculation of composite foundation-pile settlement method

On the basis of scale model experiments and numerical simulations, a new method for estimating pile settlement is presented in this paper. By analyzing different influence factors of composite foundation such as pile length, pile diameter, pile modulus, cushion thickness, cushion modulus, reinforced field soil modulus and underlying stratum soil modulus, the empirical formulas of two important parameters, pile-top stress ratio and pile-end stress ratio, are given. According to the comparison of the in-situ monitoring settlement of an engineering case, the results of pile settlement estimated by the proposed method show good agreement with the measured results. It can be concluded that the method is a potentially reliable method for engineering design.