Water Drainage in Double-Porosity Soils: Experiments and Micro–Macro Modeling
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 2
Abstract
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.
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Acknowledgments
This research was financially supported by the project ECCO-PNRH, INSU/CNRS France (now the GDR “Hydrodynamique et Transferts dans les Hydrosystèmes Souterrains”). The writers acknowledge CNRS for the BDI-PED doctoral fellowship granted to the second writer.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 134 • Issue 2 • February 2008
Pages: 231 - 243
Copyright
© 2008 ASCE.
History
Received: Nov 14, 2006
Accepted: Jun 21, 2007
Published online: Feb 1, 2008
Published in print: Feb 2008
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