土工基础

›› 2012, Vol. 26 ›› Issue (4): 64-68.

• 工程实录 • 上一篇    下一篇

基于g(θσ)法改进的剑桥模型及其应用

甄文战   

  1. 中国中铁二院工程集团有限责任公司，成都 610031
  • 收稿日期:2011-10-26 出版日期:2012-08-20 发布日期:2012-09-07
  • 作者简介:甄文战(1982-)，男，博士，工程师，研究方向为岩土工程数值计算及地下结构设计。

Revised CamClay Model Based on g(θσ) Method

ZHEN Wenzhan   

  1. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031
  • Received:2011-10-26 Online:2012-08-20 Published:2012-09-07

摘要： 针对莫尔－库仑（简称MC）准则屈服面在π平面上存在有尖点，采用了在π平面上外接MC条件六角点的g(θσ)形状函数，使得π平面上的屈服迹线变成了抹圆了角的六角形，而且和SMP准则在π平面上的屈服迹线进行了对比，分析了它们之间的差异，并把g(θσ)形状函数应用于剑桥模型，考虑了Lode角的影响，最后采用g(θσ)法改进的剑桥模型，对澳大利亚某试验段路堤软基固结进行了有限元分析，重点讨论了孔压、沉降及水平位移的变化规律。

关键词: 莫尔－库仑准则, g(&theta, &sigma, )法, 固结, 曼德尔效应

Abstract: Apexes of the MohrCoulomb yield locus in the πplane might result in unexpected singularities in numerical analyses. A shape function, g(θσ), which smoothens the angular hexagon in the MohrCoulomb criterion, is adopted. The revised yield locus becomes a rounded hexagon in the πplane. The paper also compares the differences of the locus in the πplane using the proposed g(θσ) method and the Spatially Mobilized Plane (SMP) criterion. The Lode angle is considered in a new CamClay model modified by the g(θσ) method. A finite element analysis using this constitutive model is performed on an instrumented experimental embankment in Australia. The vertical and lateral deflection of the soils and the pore water pressure dissipations are discussed in the paper.

Key words: MohrCoulomb Criterion； g(&theta, &sigma, )method； Consolidation； Mandel effect