Open AccessA Thermodynamic Approach to Effective Stresses in Unsaturated Soils Incorporating the Concept of Partial Pore Deformations
Author(s) -
Dangla Patrick,
Pereira Jean-Michel
Publication year - 2014
Publication title -
vadose zone journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.036
H-Index - 81
ISSN - 1539-1663
DOI - 10.2136/vzj2013.06.0110
Subject(s) - soil water , saturation (graph theory) , pore water pressure , effective stress , geotechnical engineering , hardening (computing) , capillary pressure , capillary action , strain hardening exponent , materials science , thermodynamics , geology , mathematics , soil science , composite material , porous medium , physics , porosity , layer (electronics) , combinatorics
The thermodynamical analysis presented here follows from the work of Coussy et al., who proposed a thermodynamically consistent model for unsaturated soils that is based on a Bishop‐like effective stress to describe the stress–strain relationship while the water saturation (or the capillary pressure) is involved in a saturation‐induced hardening in addition to the mechanical hardening. We extended this model to include the effect of interfaces in the mechanical behavior and we showed that the Bishop‐like stresses involved in the elastic and plastic responses respectively can take different expressions. The Modified Cam–Clay model used for saturated soils is extended to unsaturated soils through the use of these Bishop‐like stresses. This model is compared to some experimental results reported from the literature.