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    Volume 39, Issue 5 (September 2016)

    Investigation Into the Effects of the Thickness of a Hollow-Cylinder Soil Specimen on the Stress Distributions in Triaxial Torsional Shear Testing

    (Received 1 July 2015; accepted 5 May 2016)

    Published Online: 09 September 2016

    CODEN: GTJODJ

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    Abstract

    To investigate the effect of the thickness of a hollow cylinder on the stress distributions in a torsional triaxial shear test of clay, an equation for calculating the circumferential shear stress on a cross section of the cyclider is derived based on a linear elastic constitutive model and elastic mechanics. The “stress error” parameter and “average stress error” parameters are defined to assess the non-uniformity of stresses. The parameter ranges are discussed for specimens with various thicknesses. Torsional triaxial shear testing of specimens with different thicknesses is simulated in using a three-dimensional finite-element method (3D FEM) with Duncan–Chang's non-linear elastic model. The results show that the circumferential shear stress non-uniformity increases with increasing thickness. The maximum, minimum and average “stress error” values are analyzed for commonly used specimen dimensions. When the soil's stress–strain is linear elastic, the “average stress error” is 12.8 % for an outer radius = 50 mm and a thickness = 20 mm and 9.0 % using Duncan–Chang's model. If the “average stress error” is limited to ≤ 10 %, the ratio of the inner radius over the outer radius is 0.68.


    Author Information:

    Guo, W.-L.
    Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai Univ.; and Geotechnical Research Inst., Hohai Univ., Nanjing,

    Zhu, J.-G.
    Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai Univ.; and Geotechnical Research Inst., Hohai Univ., Nanjing,

    Yin, J.-H.
    Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic Univ., Hong Kong,

    Wen, Y. F.
    Dept. of Geotechnical Engineering, China Inst. of Water Resources and Hydropower Research, Beijing,


    Stock #: GTJ20150144

    ISSN:0149-6115

    DOI: 10.1520/GTJ20150144

    Author
    Title Investigation Into the Effects of the Thickness of a Hollow-Cylinder Soil Specimen on the Stress Distributions in Triaxial Torsional Shear Testing
    Symposium ,
    Committee D18