Effect of relative density and confining pressure on Poisson ratio from bender and extender elements tests

Kumar, J and Madhusudhan, BN (2010) Effect of relative density and confining pressure on Poisson ratio from bender and extender elements tests. In: Geotechnique, 60 (7). pp. 561-567.

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Abstract

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 (nu) was determined for dry sands with respect to changes in relative densities and effective confining pressures (sigma(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 sigma(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 (sigma(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).

Item Type:	Journal Article
Publication:	Geotechnique
Publisher:	Thomas Telford
Additional Information:	Copyright of this article belongs to Thomas Telford.
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	15 Jul 2010 06:52
Last Modified:	19 Sep 2010 06:10
URI:	http://eprints.iisc.ac.in/id/eprint/28925

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