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    Proposed constants for Bieniawski’s strength criterion for rocks and coal

    191944_93919_IJRSG_Published_Paper.pdf (3.451Mb)
    Access Status
    Open access
    Authors
    Bineshian, Hossein
    Rasouli, Vamegh
    Ghazvinian, Abdolhadi
    Bineshian, Zahra
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Bineshian, Hossein and Rasouli, Vamegh and Ghazvinian, Abdolhadi and Bineshian, Zahra. 2013. Proposed constants for Bieniawski’s strength criterion for rocks and coal. International Journal of Remote Sensing and Geoscience. (IJRSG) 2 (3): pp. 12-21.
    Source Title
    International Journal of Remote Sensing and geoscience (IJRSG)
    Additional URLs
    http://www.ijrsg.com/Files/IJRSG_06_03.pdf
    ISSN
    2319-3484
    URI
    http://hdl.handle.net/20.500.11937/37040
    Collection
    • Curtin Research Publications
    Abstract

    Bieniawski’s strength criterion is one of the most widely used criteria for strength estimation of intact rocks. This criterion, however, only considers compression loading. In Bieniawski’s criterion rocks are distinguished in their properties using two parameters В and a. Selecting these parameters, through lab experiments, as representative as possible for a certain type of rock is significantly important. The quality of lab tests, the number of tests and statistical approaches used to estimate these parameters are some of the important factors, which can influence the accuracy of the estimation. Several attempts have been made by different researchers to propose these parameters for different rock types in different regions. In this paper a similar attempt was made to determine more representative constants for Bieniawski’s criterion. This work is different from past studies in that we have based our analysis on a very large number of lab experimental data gathered from the literature and some carried out for the purpose of this study. The studied data includes a wide range of rock types from soft to hard including sandstones, shales and coals. Both linear conversion and nonlinear regression models were applied to the lab data and as a result Bieniawski’s constants were proposed for each rock type. For coal, the results are presented as a function of the loading angle with respect to the coal’s fractures. The results of nonlinear models were found to be associated with higher correlation coefficients. Also a correlation between parameter В and unconfined compressive strength was proposed. The results of this study were also compared with similar work presented in the past.

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