Practical method for settlement calculation of flexible columns composite foundation under embankment

ZHANG Ding-wen; LIU Song-yu

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Practical method for settlement calculation of flexible columns composite foundation under embankment

更新时间：2026-06-25

- Practical method for settlement calculation of flexible columns composite foundation under embankment
- Vol. 28, Issue 6, (2007)
- 作者机构：
  
  东南大学岩土工程研究所,南京,210096
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU472.3
- Online First：13 September 2013，
  
  Published：2007
- 稿件说明：
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ZHANG Ding-wen, LIU Song-yu. Practical method for settlement calculation of flexible columns composite foundation under embankment[J]. 2007, 28(6).
DOI：

ZHANG Ding-wen, LIU Song-yu. Practical method for settlement calculation of flexible columns composite foundation under embankment[J]. 2007, 28(6). DOI：

摘要

根据等应变假设得到的复合地基加固区复合模量计算公式与实际路堤荷载下柔性桩桩土间的非等应变事实不符，因此，路堤荷载下复合模量法计算的沉降量多小于实测值。通过二维有限元方法分析了路堤荷载下复合地基变形特性。采用分层总和法反算加固区复合模量，提出了复合模量计算修正方法；并通过参数分析得到了各主要影响因素对复合地基加固区变形特性的影响；对比桩体设置前后下卧层变形差异，对下卧层沉降计算方法进行修正。由此建立了有限元方法与工程实用的分层总和法之间的联系，将有限元方法实用化，分别得到了路堤荷载下柔性桩复合地基加固区和下卧层的沉降实用计算方法。实例计算证明了所推荐方法的有效性。

Abstract

The traditional calculating method of composite modulus is based on the assumption of the displacement compatibility between the flexible columns and the surrounding soil. However

case histories of embankment on ground improved by flexible columns revealed that the magnitude of the settlement of surrounding soil is often larger than that of flexible columns. The traditional composite modulus method may under-estimate the settlement of composite foundation under embankment. A two dimension finite element method (FEM) is adopted to capture the displacement incompatibility between the flexible columns and the surrounding soil under embankment and to investigate the factors influencing the settlement of composite foundation. The composite modulus of reinforced zone is back-analyzed by the layer-wise summation method. Comparison of the deformation of substratum before and after flexible columns installation yields the modified calculating method for settlement of substratum. Hence

the FEM is related with the layer-wise summation method. A practical calculating method of settlement of reinforced zone and substratum is put forward

respectively. A case study is also presented for verifying the validity of the proposed method.

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