Volume 21, Issue 1 (March 1998)

    Theoretical Evaluation of the Transient Response of Constant Head and Constant Flow-Rate Permeability Tests

    CODEN: GTJOAD

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    Abstract

    A theoretical analysis is presented that compares the response characteristics of the constant head and the constant flow-rate (flow pump) laboratory techniques for quantifying the hydraulic properties of geologic materials having permeabilities less than 10−10 m/s. Rigorous analytical solutions that describe the transient distributions of hydraulic gradient within a specimen are developed, and equations are derived for each method. Expressions simulating the inflow and outflow rates across the specimen boundaries during a constant-head permeability test are also presented. These solutions illustrate the advantages and disadvantages of each method, including insights into measurement accuracy and the validity of using Darcy's law under certain conditions. The resulting observations offer practical considerations in the selection of an appropriate laboratory test method for the reliable measurement of permeability in low-permeability geologic materials.


    Author Information:

    Zhang, M
    Geological Survey of Japan, Tsukuba, Ibaraki,

    Takahashi, M
    Geological Survey of Japan, Tsukuba, Ibaraki,

    Morin, RH
    United States Geological Survey, Denver, CO

    Esaki, T
    Faculty of Engineering, Kyushu University, Fukuoka,


    Stock #: GTJ10425J

    ISSN: 0149-6115

    DOI: 10.1520/GTJ10425J

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    Author
    Title Theoretical Evaluation of the Transient Response of Constant Head and Constant Flow-Rate Permeability Tests
    Symposium , 0000-00-00
    Committee D18