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Hydromechanical behaviour of compacted granular expansive mixtures: experimental and constitutive study / E. E. Alonso in Géotechnique, Vol. 61 N° 4 (Avril 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 4 (Avril 2011) . - pp. 329–344 Titre : Hydromechanical behaviour of compacted granular expansive mixtures: experimental and constitutive study Type de document : texte imprimé Auteurs : E. E. Alonso, Auteur ; E. Romero, Auteur ; C. Hoffmann, Auteur Année de publication : 2011 Article en page(s) : pp. 329–344 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Clays  Laboratory  tests  Fabric/Structure  of  soils  Suction  Partial  saturation  Compaction Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Compacted granular mixtures of high-density bentonite pellets have been evaluated as an alternative buffer material to fill the empty space around nuclear waste disposal canisters in horizontal drifts. Despite the obvious benefits of these compacted mixtures (the backfilling operation becomes easier and the gaps between the host rock and the buffer are minimised), there are several aspects of concern such as the effective blockage of the large inter-pellet pores due to granule swelling – this blockage improves the water permeability properties – and the tendency to develop initial collapses before reaching an adequate swelling pressure. Selected test results of a comprehensive laboratory experimental programme are presented to gain insight into the hydromechanical response of this multi-porosity compacted material. To improve the information on local transient behaviour, simulation-assisted techniques using a double-structure constitutive model are used. The paper presents a physically based one-dimensional model to simulate experimental results of different transient processes, such as the progressive loss of permeability during wetting and the occurrence of concurrent phenomena during fast flooding at constant stress (initial collapse of the granular arrangement and parallel expansion of granules). DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.2011.61.4.329 [article] Hydromechanical behaviour of compacted granular expansive mixtures: experimental and constitutive study [texte imprimé] / E. E. Alonso, Auteur ; E. Romero, Auteur ; C. Hoffmann, Auteur . - 2011 . - pp. 329–344. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 4 (Avril 2011) . - pp. 329–344 Mots-clés : Clays  Laboratory  tests  Fabric/Structure  of  soils  Suction  Partial  saturation  Compaction Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Compacted granular mixtures of high-density bentonite pellets have been evaluated as an alternative buffer material to fill the empty space around nuclear waste disposal canisters in horizontal drifts. Despite the obvious benefits of these compacted mixtures (the backfilling operation becomes easier and the gaps between the host rock and the buffer are minimised), there are several aspects of concern such as the effective blockage of the large inter-pellet pores due to granule swelling – this blockage improves the water permeability properties – and the tendency to develop initial collapses before reaching an adequate swelling pressure. Selected test results of a comprehensive laboratory experimental programme are presented to gain insight into the hydromechanical response of this multi-porosity compacted material. To improve the information on local transient behaviour, simulation-assisted techniques using a double-structure constitutive model are used. The paper presents a physically based one-dimensional model to simulate experimental results of different transient processes, such as the progressive loss of permeability during wetting and the occurrence of concurrent phenomena during fast flooding at constant stress (initial collapse of the granular arrangement and parallel expansion of granules). DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.2011.61.4.329