Damping of Sands for Varying Saturation

Madhusudhan, BN and Kumar, Jyant (2013) Damping of Sands for Varying Saturation. In: JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING, 139 (9). pp. 1625-1630.

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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 Sr 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. (C) 2013 American Society of Civil Engineers.

Item Type:	Journal Article
Publication:	JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
Publisher:	ASCE-AMER SOC CIVIL ENGINEERS
Additional Information:	Copyright for this article belongs to the ASCE-AMER SOC CIVIL ENGINEERS, USA
Keywords:	Damping Ratio; Dynamic Properties; Resonant column tests; Sands; Saturation
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	10 Mar 2014 06:35
Last Modified:	10 Mar 2014 06:35
URI:	http://eprints.iisc.ac.in/id/eprint/48518

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