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    Evaluation of the State of Rocks in Load Steps by Low-frequency Ultrasonic Flaw Detection

    Access Status
    Open access via publisher
    Authors
    Kang, S
    Kim, J
    Noh, J
    Na, T
    Jang, Hyong Doo
    Ko, C
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Kang, S and Kim, J and Noh, J and Na, T and Jang, H.D. and Ko, C 2017. Evaluation of the State of Rocks in Load Steps by Low-frequency Ultrasonic Flaw Detection. The Journal of Engineering Geology. 27 (1): pp. 51-58.
    Source Title
    The Journal of Engineering Geology
    DOI
    10.9720/kseg.2017.1.51
    ISSN
    1226-5268
    School
    Dept of Mining Eng & Metallurgical Eng
    URI
    http://hdl.handle.net/20.500.11937/52813
    Collection
    • Curtin Research Publications
    Abstract

    The purpose of this study was to quantitatively evaluate the state of rocks in load steps by using the low-frequency ultrasonic flaw detection method. The initial Vp-velocities measured with a CND tester were in the order of Z-axis < X-axis < Y-axis, with 1687.5 m/s along the X-axis, 1690.7 m/s along the Y-axis, 1548.3 m/s along the Z-axis, and an average of 1642.2 m/s. The overall average of the Q vlaues, measured with a Silver Schmidt hammer, was 62.6, which corresponds to a uniaxial compressive strength of ~105 MPa. The Vp-velocity, measured with a low-frequency ultrasonic flaw detector at load steps of 50%, 60%, 70%, and 80%, typically decreases in the order of X-axis < Y-axis < Z-axis with increasing load steps. This order contrasts with that of the initial Vp-velocities. As the load step increases the factors that reduce the Vp-velocity in the X-axis direction are more influential than those in the Y-axis or Z-axis directions. This indicates that the initial state of rocks can vary and is dependent on the stress state.

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