STP892: Centrifugal Evaluation of a Time-Dependent Numerical Model for Soft Clay Deformations

    Mitchell, JK
    Professor and Graduate Research Assistant, University of California, Berkeley, CA

    Liang, RYK
    Professor and Graduate Research Assistant, University of California, Berkeley, CA

    Pages: 26    Published: Jan 1986


    Abstract

    A series of centrifuge tests on embankment-type soil structures founded on soft clay is being conducted to evaluate a time-dependent constitutive model that incorporates the combined effects of creep and hydrodynamic consolidation. Because final coding of this new constitutive model has not yet been completed, a two-dimensional consolidation program (CON2D, developed by Chang and Duncan) is being used for preliminary analysis of test results. This paper describes the building, testing, and monitoring of the centrifuge models. The results of the centrifuge tests are interpreted and shown to compare well with predictions made using the CON2D computer program.

    Centrifuge testing is a valuable method for investigating the accuracy and usefulness of new soil behavior models, particularly in the absence of or as a supplement to detailed field records. The testing limitations imposed by centrifugal environment—the radical acceleration field and “curved” stress distribution—are examined. Stress histories and stress paths experienced by the centrifuged model are shown accountable in the numerical analyses. Data generated in this testing program can provide a reference for evaluating other constitutive relations or numerical models, thus assisting further development of predictive analytical techniques.

    Keywords:

    centrifuge, clays, numerical model, embankment, deformations, pore pressures


    Paper ID: STP34635S

    Committee/Subcommittee: D18.09

    DOI: 10.1520/STP34635S


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