Elastic moduli of soils containing large gas bubbles / S. J. Wheeler in Géotechnique, Vol. 39 N°2 (Juin 1989)  

Public ISBD [article]  inGéotechnique > Vol. 39 N°2 (Juin 1989) . - pp. 333 –342 Titre : Elastic moduli of soils containing large gas bubbles Type de document : texte imprimé Auteurs : S. J. Wheeler, Auteur ; T. N. Gardner, Auteur Année de publication : 2007 Article en page(s) : pp. 333 –342 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Elasticity Partial saturation Stiffness Shear modulus Offshore geotechnics Triaxial tests Résumé : A conceptual model for soils containing large gas bubbles is analysed to provide theoretical expressions for the drained and undrained elastic moduli. Experimental values of the undrained moduli, measured in triaxial tests at large strains, show little agreement with the theoretical predictions. This lack of agreement is probably caused by concen- trated local plastic straining, which is likely to occur in soils containing gas bubbles at all but the smallest strains. The undrained behaviour at very small strains, as represented by acoustic measure- ments of the compression wave velocity, shows much better agreement with the theoretical predictions. Improved understanding of the small strain behaviour of soils containing large gas bubbles could he of considerable benefit to the offshore industry, for predicting the deformation of foundations constructed on gas-hearing sediments. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.2.333 [article] Elastic moduli of soils containing large gas bubbles [texte imprimé] / S. J. Wheeler, Auteur ; T. N. Gardner, Auteur . - 2007 . - pp. 333 –342. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 39 N°2 (Juin 1989) . - pp. 333 –342 Mots-clés : Elasticity Partial saturation Stiffness Shear modulus Offshore geotechnics Triaxial tests Résumé : A conceptual model for soils containing large gas bubbles is analysed to provide theoretical expressions for the drained and undrained elastic moduli. Experimental values of the undrained moduli, measured in triaxial tests at large strains, show little agreement with the theoretical predictions. This lack of agreement is probably caused by concen- trated local plastic straining, which is likely to occur in soils containing gas bubbles at all but the smallest strains. The undrained behaviour at very small strains, as represented by acoustic measure- ments of the compression wave velocity, shows much better agreement with the theoretical predictions. Improved understanding of the small strain behaviour of soils containing large gas bubbles could he of considerable benefit to the offshore industry, for predicting the deformation of foundations constructed on gas-hearing sediments. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.2.333

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