Numerical study on the strain-rate sensitivity of rock: meso-mechanical approach

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    Abstract

    This paper presents a numerical study on the strain-rate effects of rock using a meso-mechanical model based on rate-dependent embedded discontinuity finite elements. The model describes the rock micro-structure as cluster of grains represented by Voronoi cells meshed with the standard 3-node triangle elements.
    The grain boundaries, and thereby the inter-granular fractures, are described by discontinuities pre-embedded into the elements adjacent to the edges of the Voronoi cells. The intra-granular fracture is accounted for by inserting new discontinuities, during the analysis, inside the grains according to the first principal stress criterion. Numerical 2D simulations of uniaxial compression test demonstrate that samples with lower L/D (length/diameter) ratio do have more pronounced strain-rate hardening effect. Therefore, the study corroborates
    the lateral inertia hypothesis. On the other hand, the numerical simulations of uniaxial tension test show that the rate-dependency is required in the model in order to predict experimentally observed dynamic tensile strength.
    Original languageEnglish
    Title of host publicationRock Dynamics and Applications 3
    Subtitle of host publicationProceedings of the 3rd International Conference on Rock Dynamics and Applications
    EditorsCharlie C Li, Xing Li, Zong-Xian Zhang
    Place of PublicationLondon
    PublisherCRC Press
    Pages195-200
    Number of pages6
    ISBN (Electronic)9780815396673
    Publication statusPublished - 2018
    Publication typeA4 Article in conference proceedings
    EventInternational Conference on Rock Dynamics and Applications -
    Duration: 1 Jan 2000 → …

    Conference

    ConferenceInternational Conference on Rock Dynamics and Applications
    Period1/01/00 → …

    Publication forum classification

    • Publication forum level 1

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