STP1281: A Modified Gradient Ratio Test Device

    Fannin, RJ
    Associate Professor and Professor, University of British Columbia, Vancouver, B.C.

    Vaid, YP
    Associate Professor and Professor, University of British Columbia, Vancouver, B.C.

    Palmeira, EM
    Associate Professor, University of Brasilia, Brasilia,

    Shi, YC
    Executive Engineer, APG Geo Design Services,

    Pages: 13    Published: Jan 1996


    Abstract

    The gradient ratio test is used to assess soil-geotextile compatibility in filtration applications. Experience gained in performing the test is summarized for ten soils and four non-woven geotextiles, and the potential for application of the test method is demonstrated. Details of a new, modified test device are then presented which address a perceived limitation of the existing configuration of the test device. Results of a preliminary series of tests, performed to commission the modified gradient ratio test device, suggest the filtration behaviour of the geotextile is essentially independent of normal stress.

    Keywords:

    geotextiles, filtration, gradient ratio, piping, clogging


    Paper ID: STP15596S

    Committee/Subcommittee: D35.10

    DOI: 10.1520/STP15596S


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