Density Index for Estimating the Postliquefaction Volumetric Strain of Silty Soils
Publication: International Journal of Geomechanics
Volume 16, Issue 5
Abstract
This study examined the liquefaction-induced ground settlement of silty sand ground, in which many nonplastic fines are contained. Investigation determined that if fines were included in the specimen, the minimum void ratio shrank more under water-immersion than dry conditions. In addition, the cyclic minimum void ratio was examined, which was obtained by cyclic liquefaction and drainage testing conducted by assuming earthquake excitation. The results illustrated that the difference between the estimated dry and cyclic minimum void ratios uniquely correlated with fines content. A new density index, the normalized margin of void ratio, was proposed for postliquefaction volumetric strain based on examination of the minimum void ratio of soils containing nonplastic fines. The test results confirmed that maximum and accumulated shear strains are satisfactory indices of loading history. Furthermore, the normalized margin of void ratio performed well as a density index for estimating postliquefaction settlements, regardless of the type or content of fines.
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Published In
International Journal of Geomechanics
Volume 16 • Issue 5 • October 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Aug 28, 2014
Accepted: Jun 29, 2015
Published online: Dec 30, 2015
Discussion open until: May 30, 2016
Published in print: Oct 1, 2016
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