Strength and Small-Strain Stiffness Characteristics of Unsaturated Sand

    Volume 34, Issue 5 (September 2011)

    ISSN: 0149-6115


    Published Online: 25 July 2011

    Page Count: 11

    Nyunt, T. T.
    Nanyang Technological Univ.,

    Leong, E. C.
    Nanyang Technological Univ.,

    Rahardjo, H.
    Nanyang Technological Univ.,

    (Received 15 November 2010; accepted 9 June 2011)


    Experiments were performed to investigate the effects of initial matric suction and net confining pressure on the small-strain stiffness and shear strength of reconstituted unsaturated sand. A series of constant water content tests was carried out using a modified triaxial apparatus equipped with local displacement transducers and bender elements. Reconstituted sand specimens were allowed to equalize at the required matric suction under net confining pressure using the axis- translation technique before shearing. After reaching matric suction equilibrium, shear wave velocities were measured prior to shearing. Multi-stage shearing tests were performed in order to investigate the effect of initial matric suction using the same specimen. The experimental results showed that at each net confining pressure, small-strain stiffness and peak shear strength showed a nonlinear relationship with matric suction with the change point near the air-entry value of the soil-water characteristic curve. Relationship between small-strain stiffness and net confining pressure was observed to be similar for saturated and unsaturated sands.

    Paper ID: GTJ103589

    DOI: 10.1520/GTJ103589

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    Title Strength and Small-Strain Stiffness Characteristics of Unsaturated Sand
    Symposium , 0000-00-00
    Committee D18