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    Determination of Fracture Toughness of Anisotropic Rocks Under Water Vapour Pressure by Semi-Circular Bend Test

    155112_31325_MPES_KOK.pdf (709.4Kb)
    Access Status
    Open access
    Authors
    Kuruppu, Mahinda
    Obara, Y.
    Kataoka, M.
    Date
    2010
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Kuruppu, M. and Obara, Y. and Kataoka, M. 2010. Determination of Fracture Toughness of Anisotropic Rocks Under Water Vapour Pressure by Semi-Circular Bend Test, in Topal, E. and Kuruppu, M. (ed), Mine Planning & Equipment Selection, Dec 1 2010, pp. 599-610. Perth, WA: The Australasian Institute of Mining and Metallurgy (AusIMM).
    Source Title
    Mine Planning and Equipment Selection MPES 2010
    Source Conference
    Mine Planning & Equipment Selection
    ISBN
    9781921522352
    School
    WASM - Western Australian School of Mines
    URI
    http://hdl.handle.net/20.500.11937/13311
    Collection
    • Curtin Research Publications
    Abstract

    Failure of rock materials is a process of crack propagation. Crack initiation takes place when the crack tip stress intensity K reaches a critical value called fracture toughness, K1C. The rock fracture toughness is known to be affected by the surrounding environment such as temperature, confining pressure and humidity. In order to examine the effect of humidity a series of semi-circular bend tests were performed under various water vapour pressures in a rock material that is known to be anisotropic. Water vapour promotes stress corrosion of rock and therefore the fracture toughness was found to have a decreasing trend with increasing water vapour pressure. The rate of decreasing the fracture toughness depends on the microcrack density that promotes the migration of water vapour into the rock. Also in an anisotropic rock the fracture toughness depends on the direction of crack in relation to the anisotropy of the rock material.

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