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Numerical simulation of water drainage in double-porosity soils

Abstract : The paper deals with modelling of unsaturated water flow in soils which are composed of two distinct sub-domains of very different hydraulic properties (double-porosity soils). Flow in such media is often characterized by the local non-equilibrium of the capillary pressure in the two regions, which cannot be described by the local equilibrium model [4]. Recently, a non-equilibrium model based on the homogenization approach has been proposed [5]. In the present paper, the model is applied to simulate gravitational drainage in a particular case of double-porosity medium. The medium consists of highly conductive sand matrix with weakly conductive spherical inclusions arranged in a periodic manner. The numerical simulations have been performed with the DPOR-1D code [11]. Calculation of the effective parameters of the medium is presented as well as the solution of the macroscopic boundary value problem. The behaviour of the double-porosity medium is compared with the behaviour of single-porosity media, i.e. a homogeneous sand and a sand with impermeable inclusions. The results show the importance of the non-equilibrium effects for the flow in double-porosity soils.
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https://hal-insu.archives-ouvertes.fr/insu-00390968
Contributor : Thierry Pellarin Connect in order to contact the contributor
Submitted on : Wednesday, June 3, 2009 - 10:26:27 AM
Last modification on : Tuesday, October 19, 2021 - 6:58:04 PM

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  • HAL Id : insu-00390968, version 1

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Adam Szymkiewicz, Jolanta Lewandowska, Michel Vauclin, Kazimierz Burzynski. Numerical simulation of water drainage in double-porosity soils. Studia Geotechnica e Mechanica, 2005, 27 (1-2), pp.177 à 186. ⟨insu-00390968⟩

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