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    A case study on tunnel blasting design evaluation considering blast damage zone

    81296.pdf (6.574Mb)
    Access Status
    Open access
    Authors
    Kang, Seong-Seung
    Jang, Hyong Doo
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kang, S.-S. and Jang, H.D. 2020. A case study on tunnel blasting design evaluation considering blast damage zone. Science and Technology of Energetic Materials. 81 (4): pp. 106-113.
    Source Title
    Science and Technology of Energetic Materials
    Additional URLs
    http://www.jes.or.jp/mag_eng/index.html
    ISSN
    1347-9466
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/81215
    Collection
    • Curtin Research Publications
    Abstract

    Hard rock tunnel blasting becomes more efficient with the state-of-the-art technology advancements of the computeraided drilling machine which minimises the drilling error. However, overbreak is still considered as the primary challenge of any tunnelling project using drilling and blasting methods. This study evaluates a standard tunnel blasting design for 1 m advance used in a tunnel construction site in Japan. Blast damage zone (BDZ) of a single buffer hole blast design of the tunnel is estimated using Ashʼs modified energy and pressure-based approaches which calculated as 0.81, and 0.95 m respectively. In succession, five numerical models with different tunnel perimeter spacing-to-burden (S/B) ratio were simulated using ANSYS AUTODYN to evaluate S/B ratio effects to damages beyond the tunnel contour. The average practical BDZ of the AUTODYN analyses was estimated at 0.83 m which is reasonably corresponding with the Ashʼs BDZ approaches. The results show that more damages caused when S/B ratio increases. When the perimeter space is fixed to 0.83 m, the most appropriate S/B ratio is 1.0 for the tunnel construction site. The presented process of the BDZ evaluation can be applied in tunnel blasting designs in practice to minimise possible overbreak.

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