桩承式路堤的工作性状分析

为更全面地分析桩承式路堤各组成部分的工作机理，降低计算复杂度，提出了一种综合考虑路堤填
料中的土拱效应和桩土的荷载传递性状的解析解法.该解析法将桩承式路堤各组成部分看作一个整体，以
桩、土和路堤三者之间的静力平衡为基础，建立了桩和土体位移的基本微分方程，通过考虑应力和变形的
协调条件，获得了桩身轴力、桩间土应力、桩侧摩阻力、桩和土体沉降等的解析解，并研究了置换率、桩
身模量、桩径、桩端土刚度和桩侧摩阻力发挥系数对沉降和荷载分担比等的影响.与工程实测数据的对比
结果表明，该解析法具有计算过程比较简单，计算结果与实测结果比较一致的特点.

Analysis of pile-supported embankments

For comprehensively analyzing the working mechanism of pile-soil-embankment and lowering the complexity of calculation, an analytic solution taking into account the soil arching effect and the characteristics of pile-soil interaction was proposed. This analytic solution takes the components of the pile-supported embankment as an integrated system. Based on the static balance among the pile, soil and embankment, the basic differential equations of the displacements of pile and soil were deduced. Considering the compatibility condition of stress and strain, the parameters of axial pile stress, soil stress among piles, pile friction, settlements of pile and soil were obtained, and the effects of the area replacement ratio, the module of pile, the pile diameter, the rigidity of soil and the coefficient of the pile friction on the settlement and the load ratio were studied. Results indicate that the calculation process of this analytic solution is simple, and that the calculation results agree well with the measured values.