Validation of a Centrifuge Permeameter for Investigation of Transient Infiltration and Drainage Flow Processes in Unsaturated Soils

    Volume 35, Issue 1 (January 2012)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Published Online: 21 October 2011

    Page Count: 11


    Parks, Jean M.
    Golder Associates,

    Stewart, Melissa A.
    Environmental and Architectural Engineering,

    McCartney, John S.
    Environmental and Architectural Engineering,

    (Received 23 November 2010; accepted 30 September 2011)

    Abstract

    This paper focuses on the validation of a centrifuge permeameter and testing methodology developed to investigate transient water flow processes in unsaturated soils. The centrifuge permeameter is capable of controlling the boundary conditions for infiltration and drainage and contains instrumentation to measure profiles of the volumetric water content and matric suction with height in a soil layer during centrifugation. Evaluations of the measured matric suction and volumetric water content profiles from a series of infiltration and drainage tests performed on a fine sand at centrifuge acceleration levels ranging from 20 to 50 times earth gravity indicate that the established equations for calculating the hydraulic conductivity of unsaturated soil at steady-state conditions might not be appropriate, except at higher centrifuge accelerations. The transient profiles were also analyzed using a form of the instantaneous profile method in which the centrifuge acceleration was incorporated into the hydraulic gradient. Although the calculated soil water retention curve and hydraulic conductivity function data show some scatter, the hysteretic behavior of the soil during wetting and drying could be assessed.


    Paper ID: GTJ103625

    DOI: 10.1520/GTJ103625

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    Author
    Title Validation of a Centrifuge Permeameter for Investigation of Transient Infiltration and Drainage Flow Processes in Unsaturated Soils
    Symposium , 0000-00-00
    Committee D18