Article (Scientific journals)
ACMEG-T: Soil Thermoplasticity Model
Laloui, Lyesse; François, Bertrand
2009In Journal of Engineering Mechanics, 135 (9), p. 932-944
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Keywords :
Plasticity; Constitutive mode; Thermal factors; Soils
Abstract :
[en] This paper addresses an advanced and unified thermomechanical constitutive model for soils. Based on experimental evidence showing the nonlinear and irreversible thermomechanical responses of saturated soils, the constitutive equations of the developed model, Advanced Constitutive Model for Environmental Geomechanics-Thermal effect (ACMEG-T), are presented. In the context of elastoplasticity and critical state theory, the model uses the multimechanism plasticity and bounding surface theory. Nonlinear thermoelasticity is joined with two coupled thermoplastic dissipative processes. The yield functions, the dissipative potentials and the plastic multipliers are introduced. Attention is particularly focused on the coupling between both plastic mechanisms, an isotropic and a deviatoric one, which are in agreement with the consistency condition for multiple dissipation. As far as isotropic mechanism is concerned, a unique thermomechanical yield surface reproduces the thermoplasticity observed at low and intermediate overconsolidation ratios, as well as the plasticity under mechanical loading in an framework unifying mechanical and thermal hardenings. Finally, the efficiency of ACMEG-T is proven by validation tests on drained and undrained thermomechanical paths.
Disciplines :
Civil engineering
Author, co-author :
Laloui, Lyesse
François, Bertrand  ;  Ecole Polytechnique Fédérale de Lausanne - EPFL > Soil Mechanics Laboratory
Language :
English
Title :
ACMEG-T: Soil Thermoplasticity Model
Publication date :
2009
Journal title :
Journal of Engineering Mechanics
ISSN :
0733-9399
Publisher :
American Society of Civil Engineers, Reston, United States - Virginia
Volume :
135
Issue :
9
Pages :
932-944
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 27 October 2009

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