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Estimation of the hydraulic parameters of unsaturated samples by electrical resistivity tomography / R. M. Cosentini in Géotechnique, Vol. 62 N° 7 (Juillet 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 7 (Juillet 2012) . - pp. 583 –594 Titre : Estimation of the hydraulic parameters of unsaturated samples by electrical resistivity tomography Type de document : texte imprimé Auteurs : R. M. Cosentini, Auteur ; G. Della Vecchia, Auteur ; S. Foti, Auteur Année de publication : 2012 Article en page(s) : pp. 583 –594 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Geophysics  Partial  saturation  Laboratory  tests  Seepage  Suction Résumé : In situ and laboratory experiments have shown that electrical resistivity tomography (ERT) is an effective tool to image transient phenomena in soils. However, its application in quantifying soil hydraulic parameters has been limited. In this study, experiments of water inflow in unsaturated soil samples were conducted in an oedometer equipped to perform three-dimensional electrical measurements. Reconstructions of the electrical conductivity at different times confirmed the usefulness of ERT for monitoring the evolution of water content. The tomographic reconstructions were subsequently used in conjunction with a finite-element simulation to infer the water retention curve and the unsaturated hydraulic conductivity. The parameters estimated with ERT agree satisfactorily with those determined using established techniques, hence the proposed approach shows good potential for relatively fast characterisations. Similar experiments could be carried out on site to study the hydraulic behaviour of the entire soil deposit. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.10.P.066 [article] Estimation of the hydraulic parameters of unsaturated samples by electrical resistivity tomography [texte imprimé] / R. M. Cosentini, Auteur ; G. Della Vecchia, Auteur ; S. Foti, Auteur . - 2012 . - pp. 583 –594. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 7 (Juillet 2012) . - pp. 583 –594 Mots-clés : Geophysics  Partial  saturation  Laboratory  tests  Seepage  Suction Résumé : In situ and laboratory experiments have shown that electrical resistivity tomography (ERT) is an effective tool to image transient phenomena in soils. However, its application in quantifying soil hydraulic parameters has been limited. In this study, experiments of water inflow in unsaturated soil samples were conducted in an oedometer equipped to perform three-dimensional electrical measurements. Reconstructions of the electrical conductivity at different times confirmed the usefulness of ERT for monitoring the evolution of water content. The tomographic reconstructions were subsequently used in conjunction with a finite-element simulation to infer the water retention curve and the unsaturated hydraulic conductivity. The parameters estimated with ERT agree satisfactorily with those determined using established techniques, hence the proposed approach shows good potential for relatively fast characterisations. Similar experiments could be carried out on site to study the hydraulic behaviour of the entire soil deposit. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.10.P.066