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论文类型：期刊论文

发表时间：2008-10-10

发表刊物：INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS

收录刊物：SCIE、EI、Scopus

卷号：32

期号：14

页面范围：1715-1735

ISSN号：0363-9061

关键字：partially saturated soil; chemical softening; return mapping algorithm; chemo-plasticity

摘要：A chemo-plastic constitutive model for partially saturated soils is proposed in this paper based on the existing models developed in Hueckel (Int. J. Numer Anal. Meth. Geomech. 1997; 21:43-72) and Gallipoli et al. (Geotechnique 2003; 53:123-135). The chemical softening effects due to the increase in contaminant mass concentration are considered based on Hueckel's chemo-plastic model. Gallipoli's model is used to simulate the effects of suction and degree of saturation on mechanical behavior of partially saturated porous materials. In order to implement the proposed model in a finite element code, a fully implicit backward-Euler integration algorithm is put forward. Numerical solutions for the tests at local level and the application of the algorithm to the real boundary value problem demonstrate the accuracy and convergence properties of the proposed integration scheme. Copyright (C) 2008 John Wiley & Sons, Ltd.