Development of an Apparatus to Investigate the Stress Variables Governing Unsaturated Soil Behavior

    Volume 28, Issue 2 (March 2005)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Published Online: 12 January 2005

    Page Count: 10


    Tarantino, A
    Università degli Studi di Trento,

    Mongiovì, L
    Università degli Studi di Trento,

    (Received 16 January 2003; accepted 9 August 2004)

    Abstract

    The paper presents the development of an apparatus to investigate the stress variables governing unsaturated soil behavior. This apparatus was devised to explore the range of negative pore-water pressures. Tests were performed by preventing deformation and water content change of an unsaturated sample and measuring changes in normal net stress and matric suction in response to a change in pore-air pressure. The condition of null deformation and null water content change was achieved by specially designing the cell and the air supply system. Vented flush diaphragm transducers and vented Imperial College tensiometers were used to measure directly normal net stress and matric suction, respectively. A preliminary test demonstrated that an interaction occurred between the soil and the flush measurement diaphragms. A specific procedure was then devised to account for the error due to this interaction. The results from the experimental tests support the assumption that the stress variables governing unsaturated soil behavior can be reduced to two stress state variables, e.g., net stress and matric suction.


    Paper ID: GTJ11861

    DOI: 10.1520/GTJ11861

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    Title Development of an Apparatus to Investigate the Stress Variables Governing Unsaturated Soil Behavior
    Symposium , 0000-00-00
    Committee D18