上海交通大学学报

上海交通大学学报 ›› 2017, Vol. 51 ›› Issue (03): 263-268.doi: 10.16183/j.cnki.jsjtu.2017.03.002

所属专题： 王建华教授学报发文专辑

• •    下一篇

基于修正剑桥模型的软黏土中沉桩过程欧拉-拉格朗日耦合模拟分析

孟振(), 陈锦剑, 王建华()   

  1. 上海交通大学土木工程系，上海 　200240
  • 收稿日期:2016-11-16 出版日期:2017-03-01 发布日期:2021-06-04
  • 作者简介:孟振（1988-)，男，山东省济宁市人，博士生，主要从事岩土数值模拟和试验工作．E-mail: 07tumumengzhen@163.com.|王建华（联系人），男，教授，博士生导师，E-mail: wjh417@sjtu.edu.cn.
  • 基金资助:
    国家自然科学基金重点项目(41330633)

The Coupled Eulerian-Lagrangian Analysis of Pile Jacking Process in Saturated Soft Clay by Using Modified Cam-Clay Model

MENG Zhen(), CHEN Jinjian, WANG Jianhua()   

  1. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2016-11-16 Online:2017-03-01 Published:2021-06-04

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摘要：

利用CEL（Coupled Eulerian-Lagrangian）有限元大变形方法模拟了不排水条件下软黏土中沉桩施工对桩周土体的影响．利用有效应力的方法实现了修正剑桥（MCC)模型Vumat子程序中超孔压的计算，通过与室内土工试验（一维压缩试验和三轴试验）结果对比证明了子程序的可靠性．将修正剑桥模型的Vumat子程序嵌入到Abaqus/Explicit的CEL方法中用于软黏土中沉桩效应的模拟分析．对计算得到的桩周土体流动、水平位移、超孔压、水平应力的分析表明，所采用的考虑孔压的CEL数值分析方法可以较好地模拟软黏土非排水条件下沉桩效应问题．

关键词: 软黏土, 修正剑桥模型, 欧拉-拉格朗日耦合, 沉桩效应, 超孔压

Abstract:

CEL (Coupled Eulerian-Lagrangian) method was used to model the pile penetration process in soft clay. Firstly, effective stress method was used in the Vumat subroutine to calculate excess pore pressure. Comparison of the experiment results (by odometer test and triaxial test) with the numerical tests demonstrated the reliability of the Vumat subroutine. The subroutine was implemented in the CEL method of Abaqus/Explicit. Pile jacking process in soft clay under undrained conditions was simulated. The soil movements, horizontal displacement, horizontal stress, excess pore pressure were analyzed. The analysis results show that the CEL method which considers excess pore pressures can simulate well the installation effects caused by pile jacking in soft clay.

Key words: soft clay, modified Cam-Clay (MCC) model, coupled Eulerian-Lagrangian (CEL), installation effect, excess pore pressures

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