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    Volume 43, Issue 5 (September 2020)

    Experimental Study on Air Expansion Deformation of Composite Geomembrane under Ring-Restrained Condition

    (Received 4 December 2018; accepted 19 September 2019)

    Published Online: 2020

    CODEN: GTJODJ

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    Abstract

    The mechanical properties and failure mechanism of composite geomembrane air expansion deformation occurring in plain reservoirs or artificial lakes are investigated. Composite geomembranes are formed by the heat combination of a core geomembrane and the geotextiles on two sides. The deformation is simplified as a spherical bulging deformation under ring-restrained conditions. The experiment is performed by a self-developed apparatus. Rules of the air expansion deformation and failure are summarized, and the following conclusions are drawn. Air expansion deformation and failure belong to tensile failure, which begins at the crown top, and a typical failure mode is a crack distributed along the crown (great circle). The composite geomembrane produces synergistic deformation during the air expansion process, and the outer geotextile bears a large tensile force. The geotextile and geomembrane are broken simultaneously and are not separated during the failure process. A 34-Hz frequency is selected as the basic loading rate for the air expansion tests of the composite geomembrane; at this frequency, the bursting pressure is 3.24 MPa, and the bursting height is 26.1 mm. The tensile stress and strain curve of a composite geomembrane can be divided into four stages: elastic stage, yield stage, strengthening phase, and breaking stage. The air expansion deformation degree is inhomogeneous, at which the maximum is at the crown top and the minimum is at the ring constraint. The air expansion elongation at break is 17.3 %, which is far less than the uniaxial tensile elongation at break of 51.7 %.

    Author Information:

    Yu, Hai-rui
    School of Water Conservancy and Environment, University of Jinan, Jinan,

    Li, Wang-lin
    School of Water Conservancy and Environment, University of Jinan, Jinan,

    Wei, Ru-chun
    School of Water Conservancy and Environment, University of Jinan, Jinan,

    Li, Chen
    School of Water Conservancy and Environment, University of Jinan, Jinan,


    Stock #: GTJ20180381

    ISSN:0149-6115

    DOI: 10.1520/GTJ20180381

    Author
    Title Experimental Study on Air Expansion Deformation of Composite Geomembrane under Ring-Restrained Condition
    Symposium ,
    Committee D35