Evaluation of reliquefaction resistance using shaking table tests

Ik Soo Ha, Scott M. Olson, Min Woo Seo, Myoung Mo Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Cases of modern and prehistoric liquefaction illustrate that sand deposits can be liquefied again (or "reliquefied") by a subsequent earthquake after initially liquefying during seismic shaking. In order to test the validity of two postulates regarding reliquefaction mechanisms and to examine the role of gradational characteristics on reliquefaction resistance, 1g shaking table tests were performed using five sands with differing gradation characteristics. The test results demonstrate that the number of cycles required to reliquefy each sand decreased significantly following the 1st liquefaction event as a result of destroying the "aged" sand fabric developed prior to the 1st shaking event via secondary compression of the initially loose sands. Reliquefaction resistance correlated reasonably well with a proxy for cv (œD102Dr2.8), illustrating that both the permeability and compressibility of the sand play significant roles in the post-liquefaction fabric (and hence reliquefaction resistance) formed by a sand. While the initial decrease in reliquefaction resistance supports both the Oda et al. [8] and the Olson et al. [5] reliquefaction postulates, only the Olson et al. [5] postulate reasonably explains the subsequent, large increase in reliquefaction resistance observed during the 3rd through 5th shaking events. These tests suggest that the coefficient of consolidation, cv=kvwmv (or proxy values such as D102Dr2.8 or D10/CU) may be a useful tool for evaluating reliquefaction potential in forward and inverse (i.e., paleoliquefaction) analysis.

Original languageEnglish (US)
Pages (from-to)682-691
Number of pages10
JournalSoil Dynamics and Earthquake Engineering
Volume31
Issue number4
DOIs
StatePublished - Apr 1 2011

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Soil Science

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