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    Volume 14, Issue 2 (June 1991)

    Effective Stress Hyperbolic Stress-Strain Parameters for Clay


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    This paper presents a procedure for estimating the effective stress hyperbolic stress-strain parameters for normally consolidated clays from the results of consolidation and direct shear tests. The procedure for calculating Young's modulus and the modulus number includes: (1) estimating the failure ratio from the shear stress-horizontal displacement curve obtained from a direct shear test; (2) using a tangent modulus at the end of each normally consolidated load increment in the consolidation test and the void ratio at the beginning of each load increment to calculate Young's modulus; and (3) multiplying the resulting modulus number by 1.9 to obtain a reasonable estimate of the isotropically consolidated-drained triaxial (CID) modulus number. The modulus exponent was approximately unity for both the consolidation and CID triaxial tests. A procedure for estimating the bulk modulus number, the bulk modulus exponent, and the unload-reload modulus number is also presented.

    Author Information:

    Stark, TD
    Assistant professor of civil engineering, University of Illinois, Urbana, IL

    Vettel, JJ
    Instructor of civil engineering, San Diego State University, San Diego, CA

    Stock #: GTJ10556J

    ISSN: 0149-6115

    DOI: 10.1520/GTJ10556J

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    Title Effective Stress Hyperbolic Stress-Strain Parameters for Clay
    Symposium , 0000-00-00
    Committee D18