Semi-analytical element method of settlement computation for composite foundation

LIU Li-ping; HUANG Yi; LI Xiang-yang; LIU Zeng-rong

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Semi-analytical element method of settlement computation for composite foundation

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- Semi-analytical element method of settlement computation for composite foundation
- Vol. 27, Issue 10期　刊出日, (2006)
- 作者机构：
  
  1. 西安建筑科技大学土木工程学院,西安,710055
  2. 西安建筑科技大学理学院,西安,710055
  3. 同济大学地下建筑与工程系,上海,200092
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU472.2
- Online First：29 November 2013，
  
  Published：2006
- 稿件说明：
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LIU Li-ping, HUANG Yi, LI Xiang-yang, et al. Semi-analytical element method of settlement computation for composite foundation[J]. 2006, 27(10期　刊出日).
DOI：

LIU Li-ping, HUANG Yi, LI Xiang-yang, et al. Semi-analytical element method of settlement computation for composite foundation[J]. 2006, 27(10期　刊出日). DOI：

摘要

将复合地基视为横观各向同性体，利用半解析数值计算原理，又将复合地基位移竖向离散为多项式，在水平两个方向上选取解析函数模拟无限域地基进行计算，从而克服了有限元计算中人为设定计算边界的弊端，提高了计算精度，并将三维沉降问题转化为一维问题进行计算，收敛速度快，显著地减少了计算工作量，将计算结果与理论解进行对比，满足精度要求。通过改变复合地基置换率、加固深度和桩土模量比，采用半解析元法研究了复合地基的加固效果，计算结果表明，桩土模量比较大时，可忽略加固区压缩变形量；增大置换率对减小沉降作用很小，而增加加固深度能明显减小复合地基沉降，在以控制沉降量为主要目的复合地基优化设计中应首先考虑增加加固深度。

Abstract

Based on the principle of semi-analytical method and the assumption of transversely isotropic material of composite foundation

a semi-analytical element method has been presented to calculate the settlement of composite foundation. Vertical displacement is discretized as polynomial expressions

and horizontal displacements are modeled by means of displacement functions in two directions to simulate infinite field. For one direction discrete and two directions analytical

this method can simplify 3-dimensional computation of displacements into one dimension

it can save computation time dramatically for its quick convergence. Furthermore it can simulate infinite soil field and acquire precise results for avoiding introduce redundant boundary condition compared with FEM

An example has been calculated with semi-analytical element method by changing substitution ratio

improved depth and modulus ratio of pile to soil of composite foundation. The results indicate that the substitution ratio and the modulus ratio of pile to soil have little effect on reducing displacement; while increasing improved depth can affect settlement obviously. So it is reasonable to increase improved depth to reduce composite foundation settlement under the circumstance that the optimum design is controlled by ground settlement.

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Related Author

LIU Li-ping1

HUANG Yi2

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LIU Li-ping

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LI Xiang-yang

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Related Institution

上海申通轨道交通研究咨询有限公司

西安建筑科技大学土木工程学院

西安建筑科技大学理学院

同济大学地下建筑与工程系

Department of Civil Engineering, Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology

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