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A coupled thermo-hydro-mechanical model of expansive clays subjected to heating and hydratation
Nadia Laredj, Hanifi Missoum, Karim Bendani, Mustapha Maliki, 2011, izvirni znanstveni članek

Opis: The focus of this work is to provide a numerical formulation for coupled thermo-hydro-mechanical processes in unsaturated expansive clays, especially in compacted bentonite, with a multiphase fluid flow. The model is characterized by the presence of a deformable solid matrix filled with two fluid phases (liquid water and air). In the proposed model, both pore-water and air transfers are assumed to be governed by the generalized Darcy’s law. Fully coupled, nonlinear partial differential equations are established and then solved by using a Galerkin weighted residual approach in the space domain and an implicit integrating scheme in the time domain. The model has been validated against an experimental test from the literature, which involves bentonite under laboratory conditions. The calculated relative errors between the experimental and numerical results are 3% for the temperature and 7% for the stresses. Consequently, the developed numerical model predicts satisfactory results, when compared to the experimental test measures. The model is applicable to two-dimensional problems with various initial and boundary conditions; non linear soil parameters can be easily included in this model.
Ključne besede: thermo-hydro-mechanical process, unsaturated bentonite, finite element, numerical modelling, expansive clays
Objavljeno: 13.06.2018; Ogledov: 129; Prenosov: 15
.pdf Celotno besedilo (389,48 KB)
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