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    Volume 41, Issue 4 (July 2018)

    A Simple Method for Assessing the Peak Friction Angle of Sand at Very Low Confining Pressures

    (Received 19 April 2017; accepted 27 September 2017)

    Published Online: 2018

    CODEN: GTJODJ

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    Abstract

    This article presents a simple experimental method that may be used to assess the peak friction angle of sand at very low effective confining pressures (i.e., <10 kPa). Soil strength at very low confining pressures is important to a variety of geotechnical problems, including small-scale 1-g physical modeling and micro-gravity environments. It is often very difficult to assess friction angles at very low confining pressures in conventional element tests because some factors, such as specimen self-weight and machine friction, become significant. Currently, there are no published methods available to measure the peak friction angle of sands below a mean effective stress at failure of about 6 kPa. To address this need, a simple tilt test method is proposed that involves preparing a soil to a specified relative density within a steel mold and then tilting the mold to induce a shallow slope failure. Based on infinite slope analysis, the tilt angle at which the slope fails is equal to the peak friction angle. A modified stress-dilatancy relationship is also proposed that can be calibrated for a specific soil using a combination of tilt test and triaxial test data. This relationship can be used to predict peak friction and dilation angles over the low stress range.

    Author Information:

    Giampa, Joseph R.
    Geotechnical Engineering Division, GEI Consultants Inc., Woburn, MA

    Bradshaw, Aaron S.
    Department of Civil and Environmental Engineering, University of Rhode Island, Kingston, RI


    Stock #: GTJ20170134

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170134

    Author
    Title A Simple Method for Assessing the Peak Friction Angle of Sand at Very Low Confining Pressures
    Symposium ,
    Committee D18