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International Journal for Multiscale Computational Engineering
Facteur d'impact: 1.016 Facteur d'impact sur 5 ans: 1.194 SJR: 0.554 SNIP: 0.68 CiteScore™: 1.18

ISSN Imprimer: 1543-1649
ISSN En ligne: 1940-4352

International Journal for Multiscale Computational Engineering

DOI: 10.1615/IntJMultCompEng.v2.i3.90
18 pages

Finite Element Modeling of a Coupled Thermo-Hydro-Mechanical Process in Porous Media

Lingfu Zeng
AF Energy and Environment Ltd., SE-40515 Goteborg, Sweden
Nils-Erik Wiberg
Department of Structural Mechanics, Chalmers University of Technology, S-41296 Goteborg, Sweden

RÉSUMÉ

This article concerns finite element modeling of a coupled thermo-hydro-mechanical process in porous media. In the article, governing differential equations for such a coupled problem of multiphases are reviewed, and a fully coupled semi-discrete finite element formulation is derived in a three-dimensional setting. Based on the fully coupled formulation, sequential partitioned finite element analysis procedures are studied for situations when the coupling effects are relatively small and approximations can be made to decouple the phase interaction. Thereafter, material modeling of mechanical behavior is studied in the framework of viscoplasticity, and a heuristic approach to modeling the thermal effect in a viscoplastic solid is discussed in terms of pressure-sensitive (for instance, Ducker—Prager and Mohr—Coulomb) yield surfaces. The coupled finite modeling technique has currently been applied in two important areas: the geological disposal of nuclear wastes and highway engineering (or road mechanics), and in this article we demonstrate such an industrial application with a numerical example.


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