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    Volume 38, Issue 2 (March 2015)

    Parasitic Head Losses During Laboratory Permeability Tests

    (Received 23 October 2013; accepted 1 December 2014)

    Published Online: 10 March 2015

    CODEN: GTJODJ

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    Abstract

    Parasitic head losses incurred outside the tested soil specimen may alter the results of laboratory permeability tests. They can be measured by running a blank test in an empty permeameter, and determining the flow resistance of the testing equipment. They can also be assessed by using the difference between a constant-head test, where the hydraulic heads are measured within the tested specimen, and a variable-head test, where the hydraulic heads are measured outside the specimen and include the parasitic head losses of the testing equipment. When not accounted for, they can lead to permeability values that are underestimated. An electric analog provides an analytical relationship between variable- and constant-head test results. The parameters in the analytical solution can be obtained via blank permeability tests. This article emphasizes the need to measure hydraulic heads inside the soil specimen during laboratory permeability tests.


    Author Information:

    Duhaime, François
    Laboratory for Geotechnical and Geoenvironmental Engineering, École de technologie supérieure, Montreal, Quebec

    Chapuis, Robert P.
    Dept. of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, Montreal, Quebec

    Weber, Simon
    Dept. of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, Montreal, Quebec


    Stock #: GTJ20130175

    ISSN:0149-6115

    DOI: 10.1520/GTJ20130175

    Author
    Title Parasitic Head Losses During Laboratory Permeability Tests
    Symposium ,
    Committee D18