Volume 33, Issue 6 (November 2010)

    Shear Wave Measurements Using Bender Elements in Argillaceous Rocks

    (Received 12 November 2009; accepted 19 June 2010)

    Published Online: 2010

    CODEN: GTJOAD

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    Abstract

    The bender element technique for the measurement of the small strain shear stiffness of soils is here extended to measurements in very stiff argillaceous rocks that will be subject to artificially induced weathering. Moduli between 3 and 17 GPa are thus determined in natural samples of two different intact materials: Lilla claystone and Opalinus clay. It is explained how practical difficulties related to bender insertion and high frequency testing were overcome. Theoretical difficulties, particularly those related with possible near field noise, are examined in detail. Travel time is established by the first break technique by jointly examining the output from several input signals of different characteristics. The error associated with the technique is bounded by making similar measurements in several dummy samples of materials (aluminum and Lucite) whose well-known elastic properties lie in a similar range to that of the tested geomaterials. The effect of suction on the small strain stiffness of the homogenous Lilla clay samples is shown to be similar to that previously observed—at a lower suction range—in unsaturated compacted soils.


    Author Information:

    Arroyo, Marcos
    Dept. of Geotechnical Engineering and Geosciences, Univ. Politècnica de Catalunya, Barcelona,

    Pineda, Jubert A.
    Dept. of Geotechnical Engineering and Geosciences, Univ. Politècnica de Catalunya, Barcelona,

    Romero, Enrique
    Dept. of Geotechnical Engineering and Geosciences, Univ. Politècnica de Catalunya, Barcelona,


    Stock #: GTJ102872

    ISSN: 0149-6115

    DOI: 10.1520/GTJ102872

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    Author
    Title Shear Wave Measurements Using Bender Elements in Argillaceous Rocks
    Symposium , 0000-00-00
    Committee D18