Measurement of Gas Permeability in Geosynthetic Clay Liners in Transient Flow Mode

    Volume 34, Issue 1 (January 2011)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Published Online: 13 September 2010

    Page Count: 7


    Pitanga, Heraldo Nunes
    Univ. of São Paulo, São Carlos, São Paulo

    Pierson, Patrick
    Professor, LTHE, Univ. Joseph Fourier, Grenoble,

    Vilar, Orencio Monje
    Professor, Univ. of São Paulo, São Carlos, São Paulo

    (Received 27 January 2010; accepted 10 August 2010)

    Abstract

    Geosynthetic clay liners (GCLs) are often selected as a part of the barrier layer for cover systems in solid waste landfills to prevent infiltration of rainfall and migration of biogas into the atmosphere. To address the ability of GCLs to mitigate gas flow through cover layers, this paper presents an apparatus and testing method to measure the gas permeability of non-saturated and strained GCLs in the laboratory. The test is performed following a transient gas flow regime, and the test results are interpreted using a simple analytical solution. A series of gas permeability tests was performed on a needle-punched GCL with a degree of saturation between 32 % and 47 %. The specimens were tested under a 20 kPa load and 1.3 % strain in the radial direction, whereas the gas flow was induced by a gas differential pressure of less than 4 kPa. The results show that both the apparatus and the testing method can provide a reliable, fast, and simple method to measure the gas permeability of GCLs.


    Paper ID: GTJ103000

    DOI: 10.1520/GTJ103000

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    Author
    Title Measurement of Gas Permeability in Geosynthetic Clay Liners in Transient Flow Mode
    Symposium , 0000-00-00
    Committee D35