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    Volume 42, Issue 4 (July 2019)

    Local and Global Volumetric Strain Comparison in Sand Specimens Subjected to Drained Cyclic and Monotonic Triaxial Compression Loading

    (Received 21 February 2017; accepted 26 April 2018)

    Published Online: 2018

    CODEN: GTJODJ

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    Abstract

    This article investigates the development of volumetric strain nonuniformities in sand specimens subjected to drained cyclic triaxial compression loading. The assessment is performed by comparing volumetric strain determinations using an external volume gauge and local axial and radial strain measurements mounted on the center of the specimen. The experimental investigation has been performed for both frictional and enlarged lubricated ends on sand specimens of different densities and fabricated using both moist tamping and dry deposition techniques. It will be shown that considerable discrepancies between the global and local volumetric determination arise even in specimens tested with enlarged lubricated ends, as a result of different volumetric tendencies (contraction or dilation) of the center and the boundaries of the specimens. These discrepancies are more pronounced for dense specimens cycled at high average stress ratios and amplitudes. The influence of three different assumptions employed to account for the specimen’s deformed profile (namely the right cylinder, parabolic, and sinusoidal profile) on the local volumetric determinations will be also assessed. Some recommendations for the need for local volumetric measurements will be attempted.

    Author Information:

    Escribano, D. E.
    Department of Civil Engineering, University of Concepción,

    Nash, D. F. T.
    Department of Civil Engineering, University of Bristol, Bristol BS4 3NJ,

    Diambra, A.
    Department of Civil Engineering, University of Bristol, Bristol BS4 3NJ,


    Stock #: GTJ20170054

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170054

    Author
    Title Local and Global Volumetric Strain Comparison in Sand Specimens Subjected to Drained Cyclic and Monotonic Triaxial Compression Loading
    Symposium ,
    Committee D18