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    Volume 39, Issue 4 (July 2016)

    Improved Load Carrying Behavior of Perfobond Rib-Installed Partially Expanded Micropiles

    (Received 30 November 2015; accepted 11 February 2016)

    Published Online: 2016

    CODEN: GTJODJ

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    Abstract

    This study proposed an advanced type of a micropile system. The proposed micropile system consists of perfobond ribs, installed on steel rod to improve shear resistance between the thread and the grout, and partially expanded drill holes to increase shear resistance between the grout and the ground. This study contained experimental evaluations on the proposed micropile system to verify the increase in the shear capacity of perfobond rib installed on the steel rod and the load-carrying capacity of shear key created by the partially expanded drill hole. Push-out tests were conducted on a rolled screw thread and perfobond rib-installed steel rods in order to compare their load-carrying capacities and load carrying behavior. It was confirmed that the proposed micropile system with perfobond-rib installed steel rods show much superior load carrying behavior in terms of initial stiffness, ultimate load, and ductile behavior. Through on-site pull-out tests, it was found that the load carrying capacity of the proposed micropile system increased significantly due to the effect of shear key created by partially expanded drill hole.


    Author Information:

    Kim, S.-H.
    Professor, School of Civil & Environmental Engineering, Yonsei Univ., Seoul,

    Choi, J.
    Ph.D. Student, School of Civil & Environmental Engineering, Yonsei Univ., Seoul,

    Lee, J.-M.
    Samho Soil Tech Co., Seoul,

    Lee, J.
    Professor, School of Civil & Environmental Engineering, Yonsei Univ., Seoul,

    Jung, C.-Y.
    School of Civil & Environmental Engineering, Yonsei Univ., Seoul,

    Senior researcher, Seismic Simulation Test Center, Pusan National Univ., Yangsan-si,


    Stock #: GTJ20150269

    ISSN:0149-6115

    DOI: 10.1520/GTJ20150269

    Author
    Title Improved Load Carrying Behavior of Perfobond Rib-Installed Partially Expanded Micropiles
    Symposium ,
    Committee D18