Application of Hilbert-Huang transform to characterize soil liquefaction and quay wall seismic responses modeled in centrifuge shaking-table tests

Yu Chen Wei, Chung Jung Lee, Wen Yi Hung, Huei Tsyr Chen

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

In this paper, a Hilbert-Huang Transform data-processing technique is successfully used to characterize the seismic responses of soil-quay wall systems using measured data in a series of geotechnical centrifuge shaking-table tests. The predominant frequency of a liquefied deposit shifts down to a low frequency level; however, "de-liquefaction" leads to frequent, local higher-frequency spikes in the time histories of predominant instantaneous frequency (PIF). A lower amount of seaward displacement was found if the combined translation and rotation modes resulted in lower excess-pore-water pressure when the wall accelerated seaward. Cyclic changes in the PIF of the wall during shaking are directly related to the stiffness of the soil in which the wall is embedded. Thus, PIF at any given instant provides a superior indicator for characterizing the occurrence of liquefaction and the time-varying soil dynamic property. This advantage assists in evaluating the degradation of soil dynamic properties at any given instant based on the acceleration time histories measured in model tests or even in the field.

Original languageEnglish
Pages (from-to)614-629
Number of pages16
JournalSoil Dynamics and Earthquake Engineering
Volume30
Issue number7
DOIs
StatePublished - Jul 2010

Keywords

  • Centrifuge modeling
  • Hilbert-Huang Transform
  • Liquefaction
  • Predominant instantaneous frequency
  • Seismic response of quay wall

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