Fan-structure shear rupture mechanism as a source of shear rupture rockbursts

Boris Tarasov

    Research output: Chapter in Book/Conference paperConference paper

    5 Citations (Scopus)

    Abstract

    This paper proposes the further development of a recently identified shearrupture mechanism (fan mechanism) that elucidates a paradoxical featureof hard rocks – the possibility of shear rupture propagation through ahighly confined intact rock mass at shear stresses that can be significantlyless than frictional strength. In the fan mechanism, failure is associatedwith consecutive creation of small slabs (known as ‘domino blocks’) fromthe intact rock in the rupture tip, driven by a fan-shaped domino structurerepresenting the rupture head. The fan head combines such unique featuresas extremely low shear resistance, self-sustaining stress intensification,and self-unbalancing conditions. Consequently, the failure process causedby the mechanism is inevitably spontaneous and violent. Physical andmathematical models explain unique and paradoxical features of themechanism, which can be generated in primary ruptures and segmentedfaults. The fan mechanism provides a novel point of view forunderstanding the nature of spontaneous failure processes, including shearrupture rockbursts. The process explains, in particular, features of shearrupture rockbursts such as activation at great depths, generation of newshear ruptures in intact rock mass, nucleation of hypocentres at significantdistances from the excavation, shear rupture development at low shearstresses, and abnormal rupture violence.
    Original languageEnglish
    Title of host publicationJournal of the Southern African Institute of Mining and Metallurgy
    Place of PublicationSouth Africa
    PublisherSouthern African Institute of Mining and Metallurgy
    Pages773 - 784
    Number of pages12
    Volume114
    ISBN (Print)0038223X
    Publication statusPublished - Oct 2014
    Event6th Southern African Rock Engineering Symposium - South Africa, Johannesburg, South Africa
    Duration: 1 Jan 20141 Jan 2014
    Conference number: 6

    Conference

    Conference6th Southern African Rock Engineering Symposium
    Abbreviated titleSARES 2014
    CountrySouth Africa
    CityJohannesburg
    Period1/01/141/01/14

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  • Cite this

    Tarasov, B. (2014). Fan-structure shear rupture mechanism as a source of shear rupture rockbursts. In Journal of the Southern African Institute of Mining and Metallurgy (Vol. 114, pp. 773 - 784). Southern African Institute of Mining and Metallurgy. http://www.saimm.co.za/Journal/v114n10p773.pdf