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    Volume 38, Issue 1 (January 2015)

    Single-Function Approach to Calibrating Whatman No. 42 Filter Paper Based on Suction Versus Water Content Relationships

    (Received 9 February 2013; accepted 17 October 2014)

    Published Online: 2015

    CODEN: GTJODJ

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    Abstract

    Several suction–water-content (s-w) calibrations for the filter paper method (FPM) used for soil-suction measurement have been published. Most of the calibrations involve a bilinear function (i.e., two different equations) with an inflection point occurring at 60 kPa < s < 100 kPa (i.e., 40 % < w < 50 %). An approach for defining a continuous calibration function with a smooth transition between the high and low suctions based on a regression analysis of various previously published calibrations obtained for filter paper Whatman No. 42 (W42) is presented and discussed. The approach is applied herein to data obtained from three established bilinear calibrations (six equations) for W42 filter paper to determine the two fitting parameters of the continuous function. An experimental evaluation of the new calibration show that the suctions estimated by the contact FPM test using the proposed function compare well with suctions measured by other laboratory techniques for two different soils for the suction range of 50 kPa < s < 400 kPa, which corresponds to a water content range of 30 % < w < 55 %.


    Author Information:

    Bicalho, Kátia V.
    Professor, Federal Univ. of Espirito Santo, Vitória, Espirito Santo,

    Bertolde, Adelmo I.
    Professor, Federal Univ. of Espirito Santo, Vitória, Espirito Santo,

    Cupertino, Kamila F.
    Graduate Student, Federal Univ. of Espirito Santo, Vitória, Espirito Santo,

    Fleureau, Jean-Marie
    Professor, Ecole Centrale Paris, Châtenay-Malabry,

    CNRS, Paris cedex 16,

    Correia, António G.
    Professor, Univ. of Minho, Guimarães,


    Stock #: GTJ20130024

    ISSN:0149-6115

    DOI: 10.1520/GTJ20130024

    Author
    Title Single-Function Approach to Calibrating Whatman No. 42 Filter Paper Based on Suction Versus Water Content Relationships
    Symposium ,
    Committee D18