Return mapping algorithm for an enhanced generalized plasticity constitutive model of partially saturated soils

H. W. Zhang, R. Santagiuliana, B. A. Schrefler

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

The objective of this paper is to investigate the stress update algorithm and the tangent operator for an enhanced generalized plasticity model developed recently for partially saturated soils, where on top of the hydrostatic and deviatoric components of the (effective) stress tensor suction has to be considered as an independent variable. The soil model used for the applications can be derived from a potential energy function and is thermodynamically consistent. The Galerkin method is used to obtain a weak form of the governing equations and a " stress-suction coupling matrix" is derived in the discretization in space by finite element method. The implicit integration algorithm is incorporated in a code for partially saturated soil dynamics. The framework of generalized plasticity is presented and examples are shown including subsidence above a model gas reservoir.

Original languageEnglish (US)
Pages (from-to)53-61
Number of pages9
JournalComputers and Geotechnics
Volume45
DOIs
StatePublished - Sep 2012

Keywords

  • Consistent tangent stiffness matrix
  • Generalized plasticity
  • Implicit integration algorithm
  • Partially saturated soils
  • Return mapping algorithm

ASJC Scopus subject areas

  • Computer Science Applications
  • Geotechnical Engineering and Engineering Geology

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