[en] The paper presents a comparison between the nonlinear elastic and elastoplastic models for Thermo-Hydro-Mechanical (THM) behaviour of an unsaturated medium. A fully coupled thermo-hydro-mechanical formulation for an unsaturated soil is considered using net stress, suction as two state variables. In this formulation, all significant coupled interactions between the different components involved in an unsaturated porous medium subjected to heating have been taken into account. The coupling effects of temperature, moisture content and deformation of skeleton are included in the nonlinear elastic model, via the temperature-dependent state surfaces concept. After a brief description of the formulation, the basic principles of the elastoplastic model are described, which considers a temperature-dependent yield surface with an associated flow rule. Then, the strong ability of this model is shown by presenting the results of analyzing of an applicative example using this model, and compared with the nonlinear elastic model using the code è-Stock.
Disciplines :
Civil engineering
Author, co-author :
Salehnia, Fatemeh ; Université de Liège > Département ArGEnCo > Géomécanique et géologie de l'ingénieur
Gatmiri, Behrouz
Language :
English
Title :
Comparison of the nonlinear elastic and elastoplastic models in THM response of unsaturated soils
Publication date :
September 2010
Event name :
Fifth international conference on unsaturated soils
Event date :
6-8 September 2010
Main work title :
Proceeddings of the fifth international conference on unsaturated soils
Alonso, E.E., Gens, A. & Josa, A. 1990. A constitutive model for partially saturated soils. Géotechnique 40(3): 405-430.
Gatmiri, B. 1997. Analysis of fully coupled behaviour of unsaturated porous media under stress, suction and temperature gradient. Final report. Paris: CERMES-EDF.
Gatmiri, B. 2000. Thermo-hydro-Mécanique des sols saturés et non saturés dans le Code-Aster. Rapport final. Paris: CERMES-EDF-MMN-CIH.
Gatmiri, B. & Arson, C. 2008. θ-Stock, a Powerful tool of thermohydromechanical behaviour and damage modelling of unsaturated porous media. Computers and Geotechnics 35(6): 890-915.
Jenab, B. 2000. Etude num?ical de la mod?isation thermo-élasto- plastique des sols non saturés. PHD Dissertation. Paris: Ecole Nationale des Ponts et Chaussées.
Philip, J.R. & de Vries, D.A. 1957. Moisture movement in porous materials under temperature gradients. Trans Am Geophys Un 38: 222-232.
Salehnia, F. 2010. Analysis of the soil media using the theory of unsaturated soils with nonlinear behaviour. M.Sc Thesis. Tehran: University of Tehran.
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