STP654

    An Analysis of NGI Simple Shear Apparatus for Cyclic Soil Testing

    Published: Jan 1978


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    Abstract

    A numerical analysis parametric study was conducted to determine the stress and strain states within an idealized soil specimen enclosed by a wire-reinforced rubber membrane and tested in the Norwegian Geotechnical Institute (NGI) simple shear apparatus. The computations were performed utilizing a finite-element program applicable to three-dimensional elastic analysis of nonaxisymmetrically loaded axisymmetric solids. Orthotropic membrane elements were incorporated in the program to simulate the action of the wire-reinforced rubber membrane. A total of 14 cases was analyzed using different combinations of material properties, membrane stiffness, specimen geometry, and boundary displacements. In general, for the values of the parameters studied, the uniformity of shear strain distribution improves as (1) the specimen height-to-diameter ratio is decreased, (2) the percent of wire-reinforcement is increased, (3) the elastic modulus of the soil decreases, (4) the Poisson's ratio of the soil decreases, and (5) the applied horizontal displacement is increased.

    Keywords:

    simple shear, NGI apparatus, soils, cyclic testing, finite elements, linear elastic analysis, reinforced membrane, stress and strain


    Author Information:

    Shen, CK
    Associate professor and professor, University of California, Davis, Calif.

    Sadigh, K
    Senior project engineer, Woodward-Cycle Consultants, San Francisco, Calif.

    Herrmann, LR
    Associate professor and professor, University of California, Davis, Calif.


    Paper ID: STP35675S

    Committee/Subcommittee: D18.05

    DOI: 10.1520/STP35675S


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