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    Volume 42, Issue 5 (September 2019)

    A Tensile Strength Apparatus with the Facility to Monitor Negative Pore-Water Pressure

    (Received 6 October 2017; accepted 22 June 2018)

    Published Online: 2018

    CODEN: GTJODJ

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    Abstract

    This article presents a new testing method for investigating the behavior of clayey geomaterials subjected to a tensile (negative) total stress. The method includes the use of high-capacity tensiometers to measure the pore–water pressure of the test specimen, an aspect which has not been demonstrated in any other direct tensile testing method. This addition allows interpretation of failure data in terms of effective stress rather than total stress, which is the approach that should be pursued in the saturated range. The test specimen shape and loading method have been modified from those commonly seen in existing literature to ensure that the direction of the major principal stress in the failure zone coincides with the direction of the externally applied tensile force, allowing for a more accurate analysis of tensile failure. Results are shown for saturated specimens and compared to results obtained for the same soil in uniaxial compression, using a modified version of the presented uniaxial tensile method, and a triaxial compression test. It is demonstrated that crack initiation occurs by shear failure if the data are interpreted in terms of effective stress rather than total stress and that the failure mechanisms under tension do not differ from compression.

    Author Information:

    Murray, Ian
    Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, Scotland

    Tarantino, Alessandro
    Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, Scotland

    Francescon, Fernando
    Department of Process Technology, Ideal Standard Italia S.r.l., Trichiana,


    Stock #: GTJ20170354

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170354

    Author
    Title A Tensile Strength Apparatus with the Facility to Monitor Negative Pore-Water Pressure
    Symposium ,
    Committee D18