Equivalent stress approach in modelling unsaturated soils

W. T. Solowski*, S. W. Sloan

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

This article presents an equivalent stress approach that can be used in many elastoplastic constitutive models for unsaturated soils. The use of the equivalent stress leads to a modified yield locus that is independent of the suction. In addition, the equivalent stress becomes the major stress variable, with suction required only as an additional variable in calculations. The model on the basis of equivalent stress predicts exactly the same soil behaviour, with the sole difference being the use of equivalent stress instead of original stress variables. This article also presents the equivalent stress formulations of several constitutive models for unsaturated soils, including the Barcelona Basic Model. The predictions from these models remain unchanged, with the only difference being in their implementation. Finally, the equivalent stress approach and the net stress approach are compared for the Barcelona Basic Model.

Original languageEnglish
Pages (from-to)1667-1681
Number of pages15
JournalINTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
Volume36
Issue number14
DOIs
Publication statusPublished - 10 Oct 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • Constitutive modelling
  • Effective stress
  • Unsaturated soils

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