Modelling of Liquefaction-Induced Instability in Pile Groups

Jonathan A. Knappett, S. P. Gopal Madabhushi

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)

7 Citations (Scopus)

Abstract

Centrifuge testing has been undertaken to investigate instability failure of pile groups during seismic liquefaction, with specific reference to the 'top-down' propagation of liquefaction during the earthquake and to account for initial imperfections in pile geometry. The results of these tests were used to validate numerical models within the finite element program ABAQUS, based on the popular p-y analysis method. Pseudostatic classical and post-buckling analyses were conducted to examine the collapse behaviour of the pile groups and were found to give reasonable predictions of collapse load and conservative predictions of the associated deflection conditions. This numerical model was compared to currently published methods which were found to over-predict collapse loads. The resulting insights into the collapse of axially loaded pile groups revealed that the failure load is strongly dependent on both the depth of liquefaction propagation and initial imperfections, which reduce the collapse load.

Original languageEnglish
Title of host publicationSeismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground
EditorsRoss W. Boulanger, Kohji Tokimatsu
PublisherAmerican Society of Civil Engineers (ASCE)
Pages255-267
Number of pages13
VolumeGSP 145
ISBN (Print)9780784408223
DOIs
Publication statusPublished - 2006
EventSeismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground - University of California, Davis, United States
Duration: 16 Mar 200518 Mar 2015

Publication series

NameGeotechnical Special Publications (GSP)
PublisherGeo-Institute, ASCE

Workshop

WorkshopSeismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground
CountryUnited States
CityDavis
Period16/03/0518/03/15

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  • Cite this

    Knappett, J. A., & Gopal Madabhushi, S. P. (2006). Modelling of Liquefaction-Induced Instability in Pile Groups. In R. W. Boulanger, & K. Tokimatsu (Eds.), Seismic Performance and Simulation of Pile Foundations in Liquefied and Laterally Spreading Ground (Vol. GSP 145, pp. 255-267). (Geotechnical Special Publications (GSP)). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/40822(184)21