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Fragmentation controlled blasting

Research Project

Project/Area Number 14350529
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

KANEKO Katsuhiko  Hokkaido Univ., Graduate School of Eng., Prof., 大学院・工学研究科, 教授 (20128268)

Co-Investigator(Kenkyū-buntansha) TAKAHASHI Hiroshi  Tohoku Univ., Graduate School of Env.Sci., Assoc.Prof., 大学院・工学研究科, 助教授 (90188045)
IGARASHI Tosifumii  Hokkaido Univ., Graduate School of Eng., Assoc.Prof., 大学院・工学研究科, 助教授 (90301944)
OGATA Yuji  AIST, Geo-Resources Development gr., Chief Researcer, 主任研究員
KATO Masaji  Hokkaido Univ., Graduate School of Eng., Res.Assoc., 大学院・工学研究科, 助手 (10250474)
KAWASAKI Satoru  Hokkaido Univ., Graduate School of Eng., Assoc.Prof., 大学院・工学研究科, 助教授 (00304022)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥11,800,000 (Direct Cost: ¥11,800,000)
Fiscal Year 2003: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2002: ¥8,000,000 (Direct Cost: ¥8,000,000)
KeywordsBlasting / Rock fragmentation / Fracture Mechanics / Crack / Fragment size distribution / Stress wave / Detonation gas / Heterogeneous material
Research Abstract

(1) The dynamic fracture process in Hopkinson's test was analyzed using proposed finite element method to verify the strain-rate dependency of dynamic tensile strength. It is clarified that the strain-rate dependency is due to the stress concentration and redistribution mechanism in the rock. The rock inhomogenety also contributed to the strain-rate dependency.
(2)The fracture process in one free-face rock was analyzed to investigate the fracture pattern and its mechanism. It was cleared that the fracture process as well as the fracture pattern were affected by the applied pressure-rate. The transition between quasi-static and dynamic fracture process can be estimated by the non-dimensional time defined by the propagation velocity, the burden and rise time of the applied pressure.
(3)A numerical simulation method, coupled the finite element arid the finite difference calculation, to analyze the multiple fracture propagation due to stress waves and the detonation gas is developed. It is c … More onfirmed that the detonation gas considerably affects the generation and propagation of the fractures and that he numerical gas-propagation velocity along the fractures approximately agrees with that obtained by the laboratory experiments. It is concluded that the gas velocity along the fracture in bench blasting is lower than the air sound velocity except for the vicinity of the blast hole.
(4)A method to predict the fragment size distribution in bench blasting using numerical and image analyses was proposed. In this method, the fracture process in bench blasting was analyzed using proposed FEM and fragment size distribution was evaluated by the image analysis of FEM result.
(5)Rock fragmentation in bench blasting was examined using proposed method and the influence of blast condition on fragmentation was clarified. It is recognized that the widely spaced blast pattern is effective to reduce the bolder in fragments. Furthermore, it is pointed out that the optimal fragmentation in the field with respect to delay time depends strongly on the gas flow through the fractures caused by the stress wave. Less

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] S.H.Cho, M.Nishi, M.Yamamoto, K.Kaneko: "Fragment size distribution in blasting"Materials Transaction. 44・5. 951-956 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, H.S.Yang, K.Kaneko: "Influence of inhomogeneity on the static tensile strength of rock"Tunnel and Underground. 13・2. 1-5 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, Y.Ogata, K.Kaneko: "Strain rate dependency of the dynamic tensile strength of rock"International Journal of Rock Mechanics & Mining Science. 40・5. 763-777 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 趙 祥鎬, 三宅秀和, 木村哲, 金子勝比古: "一自由面破砕の破壊プロセスに及ぼす圧力波形の影響に関する数値解析"Science and Technology of Energetic Material. 64・3. 116-125 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 奈良禎太, 金子勝比古: "花崗岩の直交異方弾性定数の評価法"資源と素材. 119・6. 396-402 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, K.Kaneko: "Rock Fragmentation Control in blasting"Materials Transaction. 45(5)(in press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, M.Nishi, M.Yamamoto, K.Kaneko: "Fragment size distribution in blasting"Materials Transaction. 44(5). 951-956 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, H.S.Yang, K.Kaneko: "Influence of inhomogeneity on the static tensile strength of rock"Tunnel and Underground. 13(2). 1-5 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, Y.Ogata, K.Kaneko: "Strain rate dependency of the dynamic tensile strength of rock"Int.J.of Rock Mech.& Mining Sci.. 40(5). 763-777 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, H.Miyake, T.Kimura, K.Kaneko: "Effect of the waveform of applied pressure on rock fracture process In one free-face model"Sci.& Tech.of Energetic Material. 64(3). 116-125 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Nara, K.Kaneko: "Evaluation of elastic constants of Granite"Sigen-to-Sozai. 119(6). 396-402 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, K.Kaneko: "Rock Fragmentation Control m blasting"Materials Transaction. 45(5)(in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] S.H.Cho, M.Nishi, M.Yamamoto, K.Kaneko: "Fragment size distribution in blasting"Materials Transaction. 44・5. 951-956 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.H.Cho, H.S.Yang, K.Kaneko: "Influence of inhomogeneity on the static tensile strength of rock"Tunnel and Underground. 13・2. 1-5 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.H.Cho, Y.Ogata, K.Kaneko: "Strain rate dependency of the dynamic tensile strength of rock"International Journal of Rock Mechanics & Mining Science. 40・5. 763-777 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 奈良禎太, 金子勝比古: "花崗岩の直交異方弾性定数の評価法"資源と素材. 119・6. 396-402 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 趙 祥鎬, 三宅秀和, 木村哲, 金子勝比古: "一自由面破砕の破壊プロセスに及ぼす圧力波形の影響に関する数値解析"Science and Technology of Energetic Material. 64・3. 116-125 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.H.Cho, K.Kaneko: "Rock Fragmentation Control in blasting"Materials Transaction. 45(5)(in press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] S.H.Cho, M.Nishi, M.Yamamoto, K.Kaneko: "Fragment size distribution in blasting"Materials Transaction. (in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 金子 勝比古, 趙祥鎬: "発破における岩盤破砕プロセス"混層流. 16・4. 346-352 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Nara, T.Yoneda, K.Kaneko: "Anisotropy of sub-critical crack growth in granite"Proc. of 2002 ISRM Regional Symp.. 1. 236-242 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.H.Cho, R.Kato, M.Kato, Y.Nakamura, K.Kaneko: "Development of Numerical Simulation Method for Dynamic Fracture Propagation Due to Gas Pressurization and Stress Waves"Proc. of 2002 IRSM Regional Symp.. 2. 765-762 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.H.Cho, S.Nohara, Y.Ogata, K.Kaneko: "Study on the strain rate dependency of the tensile strength of rock"Rock Fragmentation by Blasting. 1. 139-143 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 高橋弘, 門伝孝, 金子勝比古: "力覚と画像情報を用いた大岩小割作業の自動化に関する研究"資源・素材学会誌. 118・5. 369-375 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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