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An insight into the water retention properties of compacted clayey soils / E. Romero in Géotechnique, Vol. 61 N° 4 (Avril 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 4 (Avril 2011) . - pp. 313–328 Titre : An insight into the water retention properties of compacted clayey soils Type de document : texte imprimé Auteurs : E. Romero, Auteur ; G. Della Vecchia, Auteur ; C. Jommi, Auteur Année de publication : 2011 Article en page(s) : pp. 313–328 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Laboratory  tests  Suction  Partial  saturation  Fabric/Structure  of  soils  Clays  Compaction Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Experimental data from different testing methodologies on different compacted clayey soils, with dominant bimodal pore size distribution, are presented and analysed, to provide a comprehensive picture of the evolution of the aggregated fabric along hydraulic and mechanical paths. Fabric changes are analysed both from the porous network viewpoint, by means of careful mercury intrusion porosimetry investigation, and from the soil skeleton viewpoint, by quantifying swelling and shrinkage of the aggregates in an environmental scanning electron microscopy study. The consequences of the aggregated fabric evolution on the water retention properties of compacted soils are analysed and discussed. A new model for water retention domain is proposed, which introduces a dependence of the intra-aggregate pore volume on water content. The model succeeds in tracking correctly the evolution of the hydraulic state of the different soils investigated along generalised hydromechanical paths. The proposed approach brings to light coupling between intra-aggregate and inter-aggregate pores in the retention properties of compacted clayey soils. Dependence of the air entry and the air occlusion values on swelling and shrinking of aggregates, besides void ratio, is introduced and discussed. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.2011.61.4.313 [article] An insight into the water retention properties of compacted clayey soils [texte imprimé] / E. Romero, Auteur ; G. Della Vecchia, Auteur ; C. Jommi, Auteur . - 2011 . - pp. 313–328. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 4 (Avril 2011) . - pp. 313–328 Mots-clés : Laboratory  tests  Suction  Partial  saturation  Fabric/Structure  of  soils  Clays  Compaction Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Experimental data from different testing methodologies on different compacted clayey soils, with dominant bimodal pore size distribution, are presented and analysed, to provide a comprehensive picture of the evolution of the aggregated fabric along hydraulic and mechanical paths. Fabric changes are analysed both from the porous network viewpoint, by means of careful mercury intrusion porosimetry investigation, and from the soil skeleton viewpoint, by quantifying swelling and shrinkage of the aggregates in an environmental scanning electron microscopy study. The consequences of the aggregated fabric evolution on the water retention properties of compacted soils are analysed and discussed. A new model for water retention domain is proposed, which introduces a dependence of the intra-aggregate pore volume on water content. The model succeeds in tracking correctly the evolution of the hydraulic state of the different soils investigated along generalised hydromechanical paths. The proposed approach brings to light coupling between intra-aggregate and inter-aggregate pores in the retention properties of compacted clayey soils. Dependence of the air entry and the air occlusion values on swelling and shrinking of aggregates, besides void ratio, is introduced and discussed. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.2011.61.4.313

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