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    Volume 41, Issue 3 (May 2018)

    A New Laboratory Short Encapsulation Pull Test for Investigating Load Transfer Behavior of Fully Grouted Cable Bolts

    (Received 23 April 2017; accepted 31 August 2017)

    Published Online: 02 March 2018

    CODEN: GTJODJ

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    Abstract

    A new laboratory short-encapsulation pull test was developed to better understand load transfer behavior of fully grouted cable bolts that are commonly used in underground mines. Within the embedment section, a series of tests was performed to examine the effect of confining medium diameter on the maximum bearing capacity of cable bolts. A bearing plate appropriate for the investigation of bond failure at both cable/grout and grout/rock interfaces was designed. To prevent a cable bolt from rotating during the pull-out process, a system of locking keys and nuts was integrated into the design to couple together the holder tube, anchor tube, and bearing plate while still allowing axial movement of the cable bolt. Three experiments were conducted. First, different termination methods were used and compared to evaluate the effect of termination instruments on the performance of cable bolts. Then, the confining medium was subjected to a range of preconfinement pressures to determine its effect on cable bolt performance. And finally, the effect of borehole roughness on the pull-out behavior of plain and modified cable bolts was investigated. Once the testing environment was determined, pull-out tests were undertaken on plain and modified cable bolts in a medium-strength material.

    Author Information:

    Chen, Jianhang
    School of Mining Engineering, University of New South Wales, Sydney, New South Wales

    Hagan, Paul C.
    School of Mining Engineering, University of New South Wales, Sydney, New South Wales

    Saydam, Serkan
    School of Mining Engineering, University of New South Wales, Sydney, New South Wales


    Stock #: GTJ20170139

    ISSN:0149-6115

    DOI: 10.1520/GTJ20170139

    Author
    Title A New Laboratory Short Encapsulation Pull Test for Investigating Load Transfer Behavior of Fully Grouted Cable Bolts
    Symposium ,
    Committee D18