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Benchmark of experimental techniques for measuring and controlling suction / A. Tarantino in Géotechnique, Vol. 61 N° 4 (Avril 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 4 (Avril 2011) . - pp. 303–312 Titre : Benchmark of experimental techniques for measuring and controlling suction Type de document : texte imprimé Auteurs : A. Tarantino, Auteur ; D. Gallipoli, Auteur ; C. E. Augarde, Auteur Année de publication : 2011 Article en page(s) : pp. 303–312 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Laboratory  tests  Suction  Partial  saturation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The paper presents a benchmarking study carried out within the ‘Mechanics of Unsaturated Soils for Engineering' (MUSE) network aimed at comparing different techniques for measurement and control of suction. Techniques tested by the eight ‘Mechanics of Unsaturated Soils for Engineering' research teams include axis-translation (pressure plate and suction-controlled oedometer), high-capacity tensiometer and osmotic technique. The soil used in the exercise was a mixture of uniform sand, sodium bentonite (active clay) and kaolinite (non-active clay), which were all commercially available. Samples were prepared by one team and distributed to all other teams. They were normally consolidated from slurry under one-dimensional conditions (consolidometer) to a given vertical stress. The water retention characteristics of the initially saturated specimens were investigated along the main drying path. Specimens were de-saturated by applying suction through the liquid phase when using an axis-translation technique or osmotic method and de-saturated by air-drying, when suction was measured using high-capacity tensiometers. In general, the same technique was tested by at least two teams. The water retention curves obtained using the different techniques are compared and discrepancies are discussed in the paper. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.2011.61.4.303 [article] Benchmark of experimental techniques for measuring and controlling suction [texte imprimé] / A. Tarantino, Auteur ; D. Gallipoli, Auteur ; C. E. Augarde, Auteur . - 2011 . - pp. 303–312. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 4 (Avril 2011) . - pp. 303–312 Mots-clés : Laboratory  tests  Suction  Partial  saturation Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The paper presents a benchmarking study carried out within the ‘Mechanics of Unsaturated Soils for Engineering' (MUSE) network aimed at comparing different techniques for measurement and control of suction. Techniques tested by the eight ‘Mechanics of Unsaturated Soils for Engineering' research teams include axis-translation (pressure plate and suction-controlled oedometer), high-capacity tensiometer and osmotic technique. The soil used in the exercise was a mixture of uniform sand, sodium bentonite (active clay) and kaolinite (non-active clay), which were all commercially available. Samples were prepared by one team and distributed to all other teams. They were normally consolidated from slurry under one-dimensional conditions (consolidometer) to a given vertical stress. The water retention characteristics of the initially saturated specimens were investigated along the main drying path. Specimens were de-saturated by applying suction through the liquid phase when using an axis-translation technique or osmotic method and de-saturated by air-drying, when suction was measured using high-capacity tensiometers. In general, the same technique was tested by at least two teams. The water retention curves obtained using the different techniques are compared and discrepancies are discussed in the paper. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.2011.61.4.303

Formation and evolution of water menisci in unsaturated granular media / S. D. N. Lourenco in Géotechnique, Vol. 62 N° 12 (Décembre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1143 –1144 Titre : Formation and evolution of water menisci in unsaturated granular media Type de document : texte imprimé Auteurs : S. D. N. Lourenco, Auteur ; D. Gallipoli, Auteur ; C. E. Augarde, Auteur Année de publication : 2012 Article en page(s) : pp. 1143 –1144 Note générale : Génie Civil Langues : Anglais (eng) Note de contenu : Discussion ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.12.D.004 [article] Formation and evolution of water menisci in unsaturated granular media [texte imprimé] / S. D. N. Lourenco, Auteur ; D. Gallipoli, Auteur ; C. E. Augarde, Auteur . - 2012 . - pp. 1143 –1144. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1143 –1144 Note de contenu : Discussion ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.12.D.004

A hysteretic soil-water retention model accounting for cyclic variations of suction and void ratio / D. Gallipoli in Géotechnique, Vol. 62 N° 7 (Juillet 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 7 (Juillet 2012) . - pp. 605 –616 Titre : A hysteretic soil-water retention model accounting for cyclic variations of suction and void ratio Type de document : texte imprimé Auteurs : D. Gallipoli, Auteur Année de publication : 2012 Article en page(s) : pp. 605 –616 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Numerical  modelling  Partial  saturation  Suction Résumé : The paper presents a water retention model capable of predicting the hysteretic response of soils during both wetting–drying cycles at constant void ratio and compression–swelling cycles at constant suction. In the proposed model two main surfaces – the main wetting and main drying surfaces – enclose the domain of attainable soil states in the degree of saturation–suction–void ratio space. Inside this domain, the variation of degree of saturation is governed by a reversible scanning law, which describes the transition from one main surface to the other. A simplified calibration procedure is presented to select the values of the four parameters defining the two main surfaces by using a minimum of two compression tests at constant suction and one drying test at constant mean net stress. Model computations are validated against results from an experimental campaign on a compacted mixture of bentonite and kaolin. The proposed formulation is capable of capturing important soil features, such as the influence of hydraulic hysteresis and deformation on the variation of degree of saturation, and the dependence of water retention behaviour during compression on previous wetting–drying history. Moreover, during main wetting or main drying at high suction (i.e. at low saturation), the model correctly predicts a ‘virgin' retention line that uniquely relates water ratio and suction regardless of the current value of void ratio. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.11.P.007 [article] A hysteretic soil-water retention model accounting for cyclic variations of suction and void ratio [texte imprimé] / D. Gallipoli, Auteur . - 2012 . - pp. 605 –616. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 7 (Juillet 2012) . - pp. 605 –616 Mots-clés : Numerical  modelling  Partial  saturation  Suction Résumé : The paper presents a water retention model capable of predicting the hysteretic response of soils during both wetting–drying cycles at constant void ratio and compression–swelling cycles at constant suction. In the proposed model two main surfaces – the main wetting and main drying surfaces – enclose the domain of attainable soil states in the degree of saturation–suction–void ratio space. Inside this domain, the variation of degree of saturation is governed by a reversible scanning law, which describes the transition from one main surface to the other. A simplified calibration procedure is presented to select the values of the four parameters defining the two main surfaces by using a minimum of two compression tests at constant suction and one drying test at constant mean net stress. Model computations are validated against results from an experimental campaign on a compacted mixture of bentonite and kaolin. The proposed formulation is capable of capturing important soil features, such as the influence of hydraulic hysteresis and deformation on the variation of degree of saturation, and the dependence of water retention behaviour during compression on previous wetting–drying history. Moreover, during main wetting or main drying at high suction (i.e. at low saturation), the model correctly predicts a ‘virgin' retention line that uniquely relates water ratio and suction regardless of the current value of void ratio. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.11.P.007