A double structure generalized plasticity model for expansive materials

M. Sanchez, A. Gens, L.D.N. Guimarães, S. Olivella

Research output: Contribution to journalArticle

150 Citations (Scopus)

Abstract

The constitutive model presented in this work is built on a conceptual approach for unsaturated expansive soils in which the fundamental characteristic is the explicit consideration of two pore levels. The distinction between the macro- and microstructure provides the opportunity to take into account the dominant phenomena that affect the behaviour of each structural level and the main interactions between them. The microstructure is associated with the active clay minerals, while the macrostructure accounts for the larger-scale structure of the material. The model has been formulated considering concepts of classical and generalized plasticity theories. The generalized stress-strain rate equations are derived within a framework of multidissipative materials, which provides a consistent and formal approach when there are several sources of energy dissipation. The model is formulated in the space of stresses, suction and temperature; and has been implemented in a finite element code. The approach has been applied to explaining and reproducing the behaviour of expansive soils in a variety of problems for which experimental data are available. Three application cases are presented in this paper. Of particular interest is the modelling of an accidental overheating, that took place in a large-scale heating test. This test allows the capabilities of the model to be checked when a complex thermo-hydro-mechanical (THM) path is followed.
Original languageEnglish
Pages (from-to)751-787
Number of pages36
JournalInternational Journal for Numerical and Analytical Methods in Geomechanics
Volume29
Issue number8
DOIs
Publication statusPublished - 2005

Fingerprint

Plasticity
plasticity
expansive soil
Soils
microstructure
Microstructure
Clay minerals
Constitutive models
Macros
Strain rate
Energy dissipation
energy dissipation
strain rate
suction
clay mineral
Heating
heating
material
modeling
Temperature

Keywords

  • constitutive modelling
  • soils
  • suction
  • civil engineering
  • geomechanics

Cite this

Sanchez, M. ; Gens, A. ; Guimarães, L.D.N. ; Olivella, S. / A double structure generalized plasticity model for expansive materials. In: International Journal for Numerical and Analytical Methods in Geomechanics. 2005 ; Vol. 29, No. 8. pp. 751-787.
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A double structure generalized plasticity model for expansive materials. / Sanchez, M.; Gens, A.; Guimarães, L.D.N.; Olivella, S.

In: International Journal for Numerical and Analytical Methods in Geomechanics, Vol. 29, No. 8, 2005, p. 751-787.

Research output: Contribution to journalArticle

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