The Effect of Blasting Design and Rock Mass Conditions on Flight Behavior of Rock Fragmentation in Surface Mining

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  • TAKAHASHI Yoshiaki
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • YAMAGUCHI Kotaro
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • SASAOKA Takashi
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • HAMANAKA Akihiro
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • SHIMADA Hideki
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • ICHINOSE Masatomo
    Center of Urban Infrastructure, Environment and Resources
  • KUBOTA Shiro
    Research Center for Explosion Safety, National Institute of Advanced Industrial Science and Technology
  • SABURI Tei
    Research Center for Explosion Safety, National Institute of Advanced Industrial Science and Technology

Bibliographic Information

Other Title
  • 露天掘り鉱山における発破規格及び岩盤状態が起砕物の飛翔挙動に与える影響
  • ロテンボリ コウザン ニ オケル ハッパ キカク オヨビ ガンバン ジョウタイ ガ キサイブツ ノ ヒショウキョドウ ニ アタエル エイキョウ

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Description

<p>Rock blasting is one of the most common techniques for rock breakage in the open-pit mining excavation. On the other hand, the application of the technique has been restricted by law since it may cause a serious impact on surrounding environment, such as flyrock, ground vibration and noise. According to the statistics, more than 70% of accidents relating to the usage of explosives is flyrock. This accident may cause serious damage to buildings, human beings, and objects in the surrounding area. However, a detailed guideline for prevention of flyrock has not been developed yet. From these points of views, a series of field experiments was conducted and initial velocity and flying direction of fragmented rock were discussed by considering blasting standard and rock mass conditions such as strength, fractures/cracks and joints. The result shows that powder factor and burden have strong influence on the initial velocity of fragmented rock. Not only blasting designs but also rock mass conditions, cracks/joints strongly effect on the initial velocity. In addition, it was also made clear that the existence of fractures/cracks/joints in the blasting face have an obvious impact on the direction of fragmented rock.</p>

Journal

  • Journal of MMIJ

    Journal of MMIJ 135 (10), 94-100, 2019-10-31

    The Mining and Materials Processing Institute of Japan

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