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Experimental evidence of the double-porosity effects in geomaterials.

Tran Ngoc, Tien; Lewandowska, Jolanta; Bertin, Henri (2014). Experimental evidence of the double-porosity effects in geomaterials. Acta Geophysica , vol. 62 , nº 3. p. 642-655. DOI: 10.2478/s11600-013-0198-x.

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Résumé

Double-porosity is an important characteristic of microstructure in a large range of geomaterials. It designs porous media with connected fissures/fractures or aggregated soils. The origin of double-porosity can be natural or/and it can result from mechanical, chemical or biological damage. The presence of double-porosity can significantly affect the behaviour of geomaterials. In this paper we provide an experimental evidence of the double-porosity effects by performing laboratory experiments. Series of tracer dispersion experiments (in saturated and unsaturated steady-state water flow conditions) in a physical model of double-porosity geomaterial were carried out. For the comparative purposes, experiments of the same type were also performed in a singleporosity model medium. The results clearly showed that the double-porosity microstructure leads to the non-Fickian behaviour of the tracer (early breakthrough and long tail) in both saturated and unsaturated cases.

Type de document: Article
Mots-clés libres: double-porosity; physical model; unsaturated/saturated conditions; tracer dispersion; non-Fickian behaviour
Centre: Centre Eau Terre Environnement
Date de dépôt: 17 avr. 2018 20:23
Dernière modification: 17 avr. 2018 20:23
URI: http://espace.inrs.ca/id/eprint/4675

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