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    Evaluation of discontinuity and opening geometry effects on roof beam deflection

    Access Status
    Fulltext not available
    Authors
    Moussaei, N.
    Sharifzadeh, Mostafa
    Shahriar, K.
    Khosravi, M.
    Date
    2016
    Type
    Conference Paper
    
    Metadata
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    Citation
    Moussaei, N. and Sharifzadeh, M. and Shahriar, K. and Khosravi, M. 2016. Evaluation of discontinuity and opening geometry effects on roof beam deflection, in Ulusay, R. et al. (ed), Proceedings of the Rock Mechanics and Rock Engineering: From Past to the Future, Aug 29-31 2016, pp. 969-974. Cappadocia, Ürgüp, Turkey: ISRM.
    Source Title
    Rock Mechanics and Rock Engineering: From the Past to the Future
    DOI
    10.1201/9781315388502-168
    ISBN
    9781138032651
    School
    Dept of Mining Eng & Metallurgical Eng
    URI
    http://hdl.handle.net/20.500.11937/6340
    Collection
    • Curtin Research Publications
    Abstract

    Discontinuity geometry and its mechanical properties as well as opening dimensions influence the instability of the shallow underground excavations. Due to wide range of bedding structures, in this research authors tried to analyses such structure using small scale experimental and numerical models. In the tested models beddings dip varies from 0, to 90 degrees. Layer thickness is considered 16 millimeters. The tunnel width and height are considered 10, 12, and 14 times as big as the bedding thickness. Also the joint spacing is one to two times as big as the bedding thickness. Due to both low stress level and high span compared to layer thickness ratio, only buckling failure potentially occurs in roof beams. Test results show that, along with span to layer thickness ratio, bedding dip as well as sinusoidal component of layer weight affect the magnitude of deflection. Image were taken during tests and processes to measure the roof beam deflection. Model test results show that existing theories (for large deflection) predict the roof beam deflection bigger than what occurred in real condition. Finally, based on the captured results, voussoir beam theory reformed by considering the sinusoidal component of layer weight and bedding dip. Due to There is Uncertainty about ground properties, this theory predict upper and lower bound of roof beam deflection based on data obtained from physical and numerical results.

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