Settlement analysis of flexible pile composite foundation 
under embankment load

CHEN Sheng-yuan; YE Hua-yang; ZHANG Wei-feng; WEI Wei

doi:10.16285/j.rsm.2019.1902

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Settlement analysis of flexible pile composite foundation under embankment load

更新时间：2026-06-25

- Settlement analysis of flexible pile composite foundation under embankment load
- Vol. 41, Issue 9, Pages: 3077-3086(2020)
- 作者机构：
  
  1. 华南农业大学水利与土木工程学院,广东,广州,510642
  2. 河海大学水利水电学院,江苏,南京,210098
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2019.1902
  CLC： TU473.1;U213.11;U416.12
- Online First：21 October 2020，
  
  Published：2020
- 稿件说明：
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CHEN Sheng-yuan, YE Hua-yang, ZHANG Wei-feng, et al. Settlement analysis of flexible pile composite foundation under embankment load[J]. 2020, 41(9): 3077-3086.
DOI：

CHEN Sheng-yuan, YE Hua-yang, ZHANG Wei-feng, et al. Settlement analysis of flexible pile composite foundation under embankment load[J]. 2020, 41(9): 3077-3086. DOI： 10.16285/j.rsm.2019.1902.

摘要

为了寻求路堤荷载下柔性桩复合地基沉降计算的简便方法，基于已有的研究成果，将桩侧摩阻力分布简化为分段线性模式，根据桩长与临界桩长的大小关系，结合桩?土?垫层三者在交界面上的应力与压缩变形协调条件，运用单位元法推导了柔性桩复合地基加固区的沉降计算公式，并采用分层总和法计算复合地基下卧层的沉降量。结合工程实例对计算结果进行验证，结果表明：采用理论方法计算的柔性桩复合地基沉降量与现场实测沉降结果吻合较好，证明理论计算方法的合理性，且能较好地反映路堤荷载作用下柔性桩复合地基的工作性状。进一步分析表明：在临界桩长范围内，桩与桩间土相互作用，最大限度发挥了复合地基桩间土的承载能力；此外，由于桩侧负摩阻力对桩体有拖拽作用，桩身轴力在桩体中性面位置处达到最大值。因此，在工程设计中要高度重视和运用临界桩长和中性面的概念。

Abstract

This paper is aiming to find a simple method for the settlement calculation of flexible pile composite foundation under embankment load. Firstly

the side frictional distribution of pile is simplified into a piecewise linear model based on the existing research results. Then

according to the relationship between the length of pile and the critical length of pile

combined with the coordination conditions of stress and compression deformation at the interface of pile-soil-cushion

settlement calculation formulas of flexible pile composite foundation reinforcement area are deduced by using the unit element method

and the settlement of underlying layer of composite foundation is calculated by layer summation method. Finally

the proposed approach is used to predict the settlement of an engineering example

and it is found that the predictions are in accordance with measurements

demonstrating that the approach is available in reflecting the working behavior of the flexible pile composite foundation under embankment load better. Further analysis shows that within the critical length of pile

the bearing capacity of soil between piles in composite foundation is maximized by the interaction of piles and soil. In addition

due to the drag effect of the negative frictional resistance

the axial force of pile at the position of the neutral plane reaches the maximum. Therefore

the concept of critical pile length and neutral plane should be highly valued and applied in engineering design.

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