Volume 30, Issue 2 (March 2007)

    A Drainage Column Test for Determining Unsaturated Properties of Coarse Materials

    Published Online: 2006

    CODEN: GTJOAD

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    Abstract

    A column test was developed to define the water retention curve and the unsaturated permeability function of coarse materials during drainage. The test includes five steps. First, the material is placed in the column at a constant density, using vacuum and deaired water to reach close to 100 % saturation, which is checked using a mass and volume method. Second, the saturated hydraulic conductivity is determined by a constant head test. Third, a gravity drainage test is performed and the volume of drained water is monitored versus time. Fourth, after full drainage, which can take several weeks, the material is removed from the top of the column, to determine the water content versus elevation and thus the water retention curve. Fifth, the water retention data and selected models are used to predict the drainage flow rate and compare the predictions to the experimental data. This helps to define the best hydraulic functions for the material. Examples are provided to illustrate the key elements of the test.


    Author Information:

    Chapuis, RP
    Geological and Mining Engineering, Ecole Polytechnique de Montréal, Montreal, Quebec

    Corresponding author,

    Masse, I
    Geological and Mining Engineering, Ecole Polytechnique de Montréal, Montreal, Quebec

    Madinier, B
    Geological and Mining Engineering, Ecole Polytechnique de Montréal, Montreal, Quebec

    Aubertin, M
    Geological and Mining Engineering, Ecole Polytechnique de Montréal, Montreal, Quebec


    Stock #: GTJ100385

    ISSN: 0149-6115

    DOI: 10.1520/GTJ100385

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    Author
    Title A Drainage Column Test for Determining Unsaturated Properties of Coarse Materials
    Symposium , 0000-00-00
    Committee D18