Effect of relative density and confining pressure on Poisson ratio from bender and extender elements tests / J. Kumar in Géotechnique, Vol. 60 N° 7 (Juillet 2010)  

Public ISBD [article]  inGéotechnique > Vol. 60 N° 7 (Juillet 2010) . - pp. 561-567 Titre : Effect of relative density and confining pressure on Poisson ratio from bender and extender elements tests Type de document : texte imprimé Auteurs : J. Kumar, Auteur ; B. N. Madhusudhan, Auteur Année de publication : 2011 Article en page(s) : pp. 561-567 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Dynamic properties Laboratory tests Sands Shear modulus Soil dynamics Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : By using the bender and extender elements tests, together with measurements of the travel times of shear (S) and primary (P) waves, the variation of Poisson ratio (ν) was determined for dry sands with respect to changes in relative densities and effective confining pressures (σ 3). The tests were performed for three different ranges of particle sizes. The magnitude of the Poisson ratio decreases invariably with an increase in both the relative density and the effective confining pressure. The effect of the confining pressure on the Poisson ratio was found to become relatively more significant for fine-grained sand as compared with the coarse-grained sand. For a given material, at a particular value of σ 3, the magnitude of the Poisson ratio decreases, almost in a linear fashion, with an increase in the value of maximum shear modulus (G max). The two widely used correlations in literature, providing the relationships among G max, void ratio (e) and effective confining pressure (σ 3), applicable for angular granular materials, were found to compare reasonably well with the present experimental data for the fine- and medium-grained sands. However, for the coarse-grained sand, these correlations tend to overestimate the values of G max. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.t.003 [article] Effect of relative density and confining pressure on Poisson ratio from bender and extender elements tests [texte imprimé] / J. Kumar, Auteur ; B. N. Madhusudhan, Auteur . - 2011 . - pp. 561-567. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 60 N° 7 (Juillet 2010) . - pp. 561-567 Mots-clés : Dynamic properties Laboratory tests Sands Shear modulus Soil dynamics Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : By using the bender and extender elements tests, together with measurements of the travel times of shear (S) and primary (P) waves, the variation of Poisson ratio (ν) was determined for dry sands with respect to changes in relative densities and effective confining pressures (σ 3). The tests were performed for three different ranges of particle sizes. The magnitude of the Poisson ratio decreases invariably with an increase in both the relative density and the effective confining pressure. The effect of the confining pressure on the Poisson ratio was found to become relatively more significant for fine-grained sand as compared with the coarse-grained sand. For a given material, at a particular value of σ 3, the magnitude of the Poisson ratio decreases, almost in a linear fashion, with an increase in the value of maximum shear modulus (G max). The two widely used correlations in literature, providing the relationships among G max, void ratio (e) and effective confining pressure (σ 3), applicable for angular granular materials, were found to compare reasonably well with the present experimental data for the fine- and medium-grained sands. However, for the coarse-grained sand, these correlations tend to overestimate the values of G max. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.9.t.003

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