Volume 33, Issue 1 (January 2010)

    Matric Suction Measurement in Stress Path Cyclic Triaxial Testing of Unbound Granular Base Materials

    (Received 7 March 2009; accepted 15 September 2009)

    Published Online: 2009

    CODEN: GTJOAD

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    Abstract

    Unbound granular base (UGB) materials are commonly placed as part of pavement foundations. These materials are generally designed to be in an unsaturated state in order to resist the dominantly cyclic loading. Therefore, the response of UGB materials under cyclic loading needs to be studied using the framework of unsaturated soil mechanics. This requires the measurement of matric suction evolution during cyclic loading, which is a major experimental challenge to be resolved. This paper presents the development of a cyclic triaxial testing system and associated experimental techniques that meet the challenges of testing UGB materials as unsaturated soils. The testing system enables the initializing of matric suction of a specimen and facilitates direct measurement of its evolution during cyclic loading. Two types of cyclic loading could be imposed: with constant cell pressure and with cyclic cell pressure. Selected test results of both types of cyclic loading were presented to demonstrate satisfactory performance of the proposed methodology. Furthermore, a detailed analysis of these selected test results was also undertaken to show the importance of matric suction for understanding the behavior of UGB materials under cyclic loading.


    Author Information:

    Craciun, Ovidiu
    School of Aerospace, Civil and Mechanical Engineering, Univ. of New South Wales at Australian Defence Force Academy, Canberra, Australian Capital Territory

    Lo, Sik-Cheung Robert
    Associate Professor, School of Aerospace, Civil and Mechanical Engineering, Univ. of New South Wales at Australian Defence Force Academy, Canberra, Australian Capital Territory


    Stock #: GTJ102390

    ISSN: 0149-6115

    DOI: 10.1520/GTJ102390

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    Author
    Title Matric Suction Measurement in Stress Path Cyclic Triaxial Testing of Unbound Granular Base Materials
    Symposium , 0000-00-00
    Committee D18