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Damping of sands for varying saturation

Damping of sands for varying saturation
Damping of sands for varying saturation
A series of resonant column tests have been performed in the torsional mode of vibration to assess the effect of saturation, starting from the near dry state to the fully saturated state, on the damping ratio of sands corresponding to the threshold strain level. Tests were carried out on three different gradations of sand for various combinations of relative density and effective confining pressure. For fine sands, a certain optimum degree of saturation exists at which the damping ratio minimizes; it is known that a decrease in SrSr from a fully saturated state leads to a continuous increase in the matric suction. With an increase in the relative density, the optimum degree of saturation for fine sand increases marginally from 1.38 to 1.49%, but does not show any dependency on the effective confining pressure. In contrast, the minimum values of the damping ratio for medium and coarse sands are found to always correspond to the near dry state. The damping ratio decreases continuously with increases in relative density and effective confining pressure. The threshold strain level has been found to decrease continuously with increases in relative density and effective confining pressure.

1090-0241
1625-1630
Madhusudhan, B.N.
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Kumar, Jyant
c70d5995-3239-4de7-8ff1-44cf50fa4b2e
Madhusudhan, B.N.
e139e3d3-2992-4579-b3f0-4eec3ddae98c
Kumar, Jyant
c70d5995-3239-4de7-8ff1-44cf50fa4b2e

Madhusudhan, B.N. and Kumar, Jyant (2013) Damping of sands for varying saturation. Journal of Geotechnical and Geoenvironmental Engineering, 139 (9), 1625-1630. (doi:10.1061/(ASCE)GT.1943-5606.0000895).

Record type: Article

Abstract

A series of resonant column tests have been performed in the torsional mode of vibration to assess the effect of saturation, starting from the near dry state to the fully saturated state, on the damping ratio of sands corresponding to the threshold strain level. Tests were carried out on three different gradations of sand for various combinations of relative density and effective confining pressure. For fine sands, a certain optimum degree of saturation exists at which the damping ratio minimizes; it is known that a decrease in SrSr from a fully saturated state leads to a continuous increase in the matric suction. With an increase in the relative density, the optimum degree of saturation for fine sand increases marginally from 1.38 to 1.49%, but does not show any dependency on the effective confining pressure. In contrast, the minimum values of the damping ratio for medium and coarse sands are found to always correspond to the near dry state. The damping ratio decreases continuously with increases in relative density and effective confining pressure. The threshold strain level has been found to decrease continuously with increases in relative density and effective confining pressure.

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More information

Accepted/In Press date: 14 January 2013
e-pub ahead of print date: 16 January 2013
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 400456
URI: https://eprints.soton.ac.uk/id/eprint/400456
ISSN: 1090-0241
PURE UUID: 1cc290f9-5dab-4f2f-a54b-f45bf8bd7270
ORCID for B.N. Madhusudhan: ORCID iD orcid.org/0000-0002-2570-5934

Catalogue record

Date deposited: 19 Sep 2016 08:36
Last modified: 19 Jul 2019 00:37

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