Evaluation of shear modulus and damping in dynamic centrifuge tests

A. J. Brennan, N. I. Thusyanthan, S. P. G. Madabhushi

    Research output: Contribution to journalArticlepeer-review

    153 Citations (Scopus)

    Abstract

    Correct evaluation of shear modulus and damping characteristics in soils under dynamic loading is key to both the fundamental understanding of soil behavior and the practical application of soil modeling programs. Dynamic centrifuge tests can contribute significant information about soil behavior, but great care must be taken over the signal processing techniques involved, and the test conditions are different from the laboratory experiments that form the database of existing knowledge. This paper outlines several factors that require careful consideration when deriving stiffness and damping parameters from centrifuge data. Shear modulus and damping degradation curves for a dry sand, saturated sand, soft clay and a model waste are then evaluated to explore some of the factors that are introduced during centrifuge tests. Stiffness is seen to be a more reliable parameter than damping ratio. Damping during centrifuge tests for certain materials appeared to differ from the expected values.
    Original languageEnglish
    Pages (from-to)1488-1497
    Number of pages10
    JournalJournal of Geotechnical and Geoenvironmental Engineering
    Volume131
    Issue number12
    DOIs
    Publication statusPublished - 2005

    Keywords

    • Shear
    • Damping
    • Soil dynamics
    • Sand
    • Clays
    • Municipal wastes
    • Centrifuge

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