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    Effect of grain shapes in coordination number from micro-CT image analysis of an unconsolidated sand

    Access Status
    Fulltext not available
    Authors
    Ahmed, Z.
    Lebedev, Maxim
    Madadi, Mahyar
    Date
    2017
    Type
    Conference Paper
    
    Metadata
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    Citation
    Ahmed, Z. and Lebedev, M. and Madadi, M. 2017. Effect of grain shapes in coordination number from micro-CT image analysis of an unconsolidated sand, 79th EAGE Conference and Exhibition 2017.
    Source Title
    79th EAGE Conference and Exhibition 2017
    Source Conference
    79th EAGE Conference and Exhibition 2017
    DOI
    10.3997/2214-4609.201701189
    ISBN
    9789462822177
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/67709
    Collection
    • Curtin Research Publications
    Abstract

    Coordination number (CN, average number of contacts a grain has with its neighbours inside a granular medium) appears to be one of the important parameters in contact based modelling of elastic properties including seismic velocities in unconsolidated sands. We analyse micro-CT images of two different resolutions of the same unconsolidated quartz sand, in order to find CN and morphology of the grains. Both of the image sets give similar results in CN and size distribution whereas grain morphology differs slightly. We find that the number of grains, to be considered for calculations in the lower resolution image, is sufficient enough to provide a better normal distribution data. However, a decreasing of sphericity and roundness on the grains show a very gentle increasing trend in CNs. Therefore, for modelling of elastic properties, not only CN, but grain morphology should also be considered along with other factors such as pressure, initial porosity, loading unloading history, and prepacking conditions.

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