Comparison of factors influencing time-dependent strength gain in recently disturbed sand deposits

David A Saftner, Roman D. Hryciw, Russell A. Green

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The study presented here investigates factors causing time-dependent strength gain in recently disturbed granular materials, a phenomenon commonly referred to as "sand aging." Sand aging has been recorded following earthquakes, deposition of fill, and soil improvement projects. Its manifestation includes an increase in cone penetration test (CPT) tip resistance (qc|N), standard penetration test (SPT) blow count (N), and small strain shear wave velocity (Vs) with time. While there is still no consensus on the dominant mechanism, several hypotheses have been proposed for the causative mechanism. These include a chemical mechanism (i.e., precipitation of a cementing agent); a mechanical mechanism (i.e., asperity shearing and particle rotation); and dissolution of air bubbles. Because of the expanding database of sand-aging case histories, it is now possible to compare recorded aging effects to the proposed mechanisms influencing sand aging. Toward this end, data from 26 case histories, including three field-scale experiments conducted by the authors at two different sites, were used to investigate the magnitude of sand aging as a function of the factors hypothesized to be responsible for the aging. From this study, disturbance method, pore fluid composition, mean grain size, qc1Nfresh (as a proxy for D r), and σv were found to influence aging, while the influence of the soil's chemical composition, temperature, coefficient of uniformity, grain shape, and aeration of the pore fluid were inconclusive.

Original languageEnglish (US)
Title of host publicationGeo-Congress 2014 Technical Papers
Subtitle of host publicationGeo-Characterization and Modeling for Sustainability - Proceedings of the 2014 Congress
PublisherAmerican Society of Civil Engineers (ASCE)
Pages93-102
Number of pages10
Edition234 GSP
ISBN (Print)9780784413272
DOIs
StatePublished - Jan 1 2014
Event2014 Congress on Geo-Characterization and Modeling for Sustainability, Geo-Congress 2014 - Atlanta, GA, United States
Duration: Feb 23 2014Feb 26 2014

Publication series

NameGeotechnical Special Publication
Number234 GSP
ISSN (Print)0895-0563

Other

Other2014 Congress on Geo-Characterization and Modeling for Sustainability, Geo-Congress 2014
CountryUnited States
CityAtlanta, GA
Period2/23/142/26/14

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