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Water drainage in double-porosity soils / Jolanta Lewandowska in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°2 (Fevrier 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°2 (Fevrier 2008) . - pp. 231–243 Titre : Water drainage in double-porosity soils : experiments and micro–macro modeling Type de document : texte imprimé Auteurs : Jolanta Lewandowska, Auteur ; Tien Dung Tran Ngoc, Auteur ; Michel Vauclin, Auteur Année de publication : 2008 Article en page(s) : pp. 231–243 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Unsaturated  soils  Nonuniform  flow  Drainage  Microstructure  Heterogeneity  Scale  effect  Gamma  rays  Model  verification  Porous  media Résumé : This paper presents the experimental validation of a macroscopic model of unsaturated flow in double-porosity soils, which was developed using the asymptotic homogenization method. The model was implemented into a code which enables micro–macro coupled calculations of macroscopically one-dimensional and microscopically three-dimensional problems. A series of drainage experiments were carried out in a column filled with a double porosity medium. The porous medium is composed of Hostun sand and porous spheres made of sintered clay, periodically distributed in the sand. The characteristic pores sizes of the two media differ by two orders of magnitude. During the experiments the water content evolution inside the column, the capillary pressure, and the flux at the bottom of the column were measured. The numerical simulations results showed a good agreement with the experimental data, confirming the predictive ability of the model. The experimental and numerical evidence of the influence of the microporous inclusions on the flow dynamics (flux retardation, water retention in the microporosity), is clearly shown. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A2%2823 [...] [article] Water drainage in double-porosity soils : experiments and micro–macro modeling [texte imprimé] / Jolanta Lewandowska, Auteur ; Tien Dung Tran Ngoc, Auteur ; Michel Vauclin, Auteur . - 2008 . - pp. 231–243. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°2 (Fevrier 2008) . - pp. 231–243 Mots-clés : Unsaturated  soils  Nonuniform  flow  Drainage  Microstructure  Heterogeneity  Scale  effect  Gamma  rays  Model  verification  Porous  media Résumé : This paper presents the experimental validation of a macroscopic model of unsaturated flow in double-porosity soils, which was developed using the asymptotic homogenization method. The model was implemented into a code which enables micro–macro coupled calculations of macroscopically one-dimensional and microscopically three-dimensional problems. A series of drainage experiments were carried out in a column filled with a double porosity medium. The porous medium is composed of Hostun sand and porous spheres made of sintered clay, periodically distributed in the sand. The characteristic pores sizes of the two media differ by two orders of magnitude. During the experiments the water content evolution inside the column, the capillary pressure, and the flux at the bottom of the column were measured. The numerical simulations results showed a good agreement with the experimental data, confirming the predictive ability of the model. The experimental and numerical evidence of the influence of the microporous inclusions on the flow dynamics (flux retardation, water retention in the microporosity), is clearly shown. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A2%2823 [...]