Volume 32, Issue 5 (September 2009)

    Modified Pressure Plate Apparatus and Column Testing Device for Measuring SWCC of Sand

    (Received 25 June 2007; accepted 28 June 2009)

    Published Online: 2009

    CODEN: GTJOAD

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    Abstract

    The determination of soil-water characteristic curve (SWCC) is of major concern in unsaturated soil mechanics. For decades experimental and theoretical studies are performed to investigate the constitutive relationship between soil suction and volumetric water content. The major objective of our study is to generate an extensive experimental database for sand with a relevant suction range of just a few kPa. This database enables to derive conclusions on the sensitivity of hydraulic properties regarding different experimental procedures. Further, one objective is the comparison of results for SWCC derived from steady state and transient state tests. While the first type of tests considers equilibrium states, the subsequent test is related to non-equilibrium states. Experimental results are generated from a so called homogenous element test (modified pressure plate apparatus) and an initial boundary value experiment (column testing device) considering different hydraulic loading path directions. The experiments are analysed for sand with different initial states. Finally results are presented for SWCC including initial curves, main curves, and scanning paths. Discussion is focused on transient state versus steady state flow tests. No significant dynamic effects are observed for the sand studied. Results of well controlled element tests compare very well to initial boundary value experiments implying higher experimental efforts.


    Author Information:

    Lins, Yvonne
    Ruhr Universität Bochum, Chair for Foundation Engineering, Soil and Rock Mechanics, Bochum,

    Schanz, Tom
    Ruhr Universität Bochum, Chair for Foundation Engineering, Soil and Rock Mechanics, Bochum,

    Fredlund, Delwyn G.
    Golder Associates, Ltd., Saskatoon, SK


    Stock #: GTJ101318

    ISSN: 0149-6115

    DOI: 10.1520/GTJ101318

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    Author
    Title Modified Pressure Plate Apparatus and Column Testing Device for Measuring SWCC of Sand
    Symposium , 0000-00-00
    Committee D18