Volume 35, Issue 4 (July 2012)

    Field Test of Circular Footings on Reinforced Granular Fill Layer Overlying a Clay Bed

    (Received 25 October 2010; accepted 6 December 2011)

    Published Online: 2012

    CODEN: GTJOAD

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    Abstract

    The ultimate bearing capacity and settlement of a circular shallow rigid plate on compacted granular fill layer with and without geogrid reinforcement overlying on natural clay deposit exhibiting low bearing capacity and large settlement have been investigated. A total of 15 field tests were carried out using a circular model rigid plate with a diameter of 0.90 m. This study has been initially directed to evaluate the beneficial effects of the compacted granular fill layer on natural clay deposit for the shallow rigid plate performance. Then, the reinforcing effect of the top granular fill layer with horizontal layers of welded geogrid reinforcement on the bearing capacity and settlement has been studied. Parameters of the testing program include granular fill thickness, depth of first reinforcement, vertical spacing of reinforcement layers, and number of reinforcement layers. Bearing capacity ratio (BCR) and percentage reduction in settlement (PRS) were defined to evaluate improvement performance. Based on the test results, the effect of the granular fill and welded geogrid reinforcement on the bearing capacity and settlement are discussed. The results indicate that the use of granular fill layers over natural clay soils has considerable effects on the bearing capacity and settlement characteristics. The construction of granular fill layer with welded geogrid reinforcement over clay deposit helps in redistributing the applied load to a wider area. It has been observed that the use of welded geogrid reinforcement in granular fill layer provides additional improvement of bearing capacity and provides reduction in settlement of the rigid plate up to 80 and 60 %, respectively.


    Author Information:

    Laman, Mustafa
    Professor, Civil Engineering Dept., Adana Science and Technology Univ., Adana,

    Yildiz, Abdulazim
    Assoc. Prof., Civil Engineering Dept., Cukurova Univ., Balcali/Adana,

    Ornek, Murat
    Assist. Prof., Civil Engineering Dept., Mustafa Kemal Univ., Iskenderun/Hatay,

    Demir, Ahmet
    Assist. Prof., Civil Engineering Dept., Korkut Ata Univ., Osmaniye,


    Stock #: GTJ103512

    ISSN: 0149-6115

    DOI: 10.1520/GTJ103512

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    Author
    Title Field Test of Circular Footings on Reinforced Granular Fill Layer Overlying a Clay Bed
    Symposium , 0000-00-00
    Committee D18