Un modèle pour l'infiltration dans les sols gelés tenant compte de la qualité de l'eau

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Abstract
The infiltration of water in frozen soils is solved using finite element methods for the numerical solution of water flow, heat, and solute transport in one dimension. These equations are coupled for the solution of Stefan's problem for different conditions of ice in soils. The degrees of freedom of this problem are soil temperature, water pressure, and solute concentration. A model is proposed to simulate the presence and formation of ice lenses in unsaturated and saturated soils. Early results are very promising when compared to analytical solutions.Two extreme cases are considered in applications: very wet and very dry soils. Frost heave and other parameters seem to have been properly simulated. The present model considers special phenomena related to colloidal soils; nevertheless, a comparison with field data is required. Key words: frozen soils, frost heave, unsaturated zone, heat transport, mass transport, Stefan problem, finite elements, phase change.

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