Identification of soil dynamic properties through an optimization analysis

V. Mercado, W. El-Sekelly, M. Zeghal, Tarek Abdoun

    Research output: Contribution to journalArticle

    Abstract

    An identification technique is used to estimate the nonlinear dynamic properties of a soil deposit using the acceleration records provided by a vertical (downhole) array along with a nonlinear least squares optimization algorithm. The technique employs non-parametric estimates of the shear stresses derived from the recorded accelerations; therefore, it does not require the forward modeling of the whole soil deposit. Soil properties are described by a hyperbolic shear stress-strain relation. A multi-surface plasticity approach is used to model the stress-strain relation. Convergence and accuracy of the identification technique are assessed using numerical simulations. Two centrifuge experiments are used to validate and demonstrate the capabilities of the technique to estimate the stiffness and damping ratio profiles of a site subjected to base excitation. Performance of the technique is also evaluated using field data corresponding to the 1987 Superstition Hills earthquake recordings from the Wildlife Liquefaction Array at the Imperial Valley in Southern California. The identification results were found to be in good agreement with direct measurements of shear wave velocities.

    Original languageEnglish (US)
    Pages (from-to)175-186
    Number of pages12
    JournalComputers and Geotechnics
    Volume65
    DOIs
    StatePublished - Apr 1 2015

    Fingerprint

    soil dynamics
    dynamic property
    shear stress
    Soils
    Shear stress
    forward modeling
    Deposits
    centrifuge
    liquefaction
    damping
    plasticity
    wave velocity
    stiffness
    S-wave
    soil property
    soil
    Shear waves
    Centrifuges
    Liquefaction
    valley

    Keywords

    • Centrifuge
    • Damping
    • Shear wave velocity
    • Soil dynamics
    • System identification

    ASJC Scopus subject areas

    • Geotechnical Engineering and Engineering Geology
    • Computer Science Applications

    Cite this

    Identification of soil dynamic properties through an optimization analysis. / Mercado, V.; El-Sekelly, W.; Zeghal, M.; Abdoun, Tarek.

    In: Computers and Geotechnics, Vol. 65, 01.04.2015, p. 175-186.

    Research output: Contribution to journalArticle

    Mercado, V. ; El-Sekelly, W. ; Zeghal, M. ; Abdoun, Tarek. / Identification of soil dynamic properties through an optimization analysis. In: Computers and Geotechnics. 2015 ; Vol. 65. pp. 175-186.
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