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2018 Fiscal Year Annual Research Report

Dynamic Study on the Complexity of Three-Dimensional Fracture of Planes of Weakness

Research Project

Project/Area Number 16K06487
Research InstitutionThe University of Tokyo

Principal Investigator

上西 幸司  東京大学, 大学院新領域創成科学研究科, 教授 (60311776)

Project Period (FY) 2016-04-01 – 2019-03-31
Keywords地震 / 地盤工学 / 防災 / 破壊力学 / 動力学
Outline of Annual Research Achievements

力学的未解明点が数多く存在する、地震などの災害の発生機構をより深く理解するに当たり、まず断層面や節理面等の地質学的不連続面においてどのように複雑な破壊が進展するのか明らかにする必要があると思われるが、ここでは、三次元的な広がりをもつ不連続面の破壊現象の諸々の複雑性に関して室内実験や理論、数値解析を通して動力学的に考察し、また、それらの破壊複雑性が不連続面周辺の構造物群等に与える影響を定量的に評価することを目的としている。研究最終年度である平成30年度は、前年度に引き続き、本研究課題で構築した破壊実験・計算機システムを使用し、脆性固体における衝撃的な三次元破壊進展や粒状体模擬斜面における波動や動的破壊の伝播、不連続に存在する亀裂群の動力学的弾性相互作用など、不連続面破壊の時空間的複雑性について、より高い精度での実験計測や理論考察を進めた。その結果、今まで認識されてこなかったが単純明快な三次元脆性固体破壊パターンや粒状体における二種の異なるエネルギー伝達機構などが明らかとなった。以上のような動的破壊多様性に関する研究成果については、22nd European Conference on Fracture(セルビア・ベオグラード)や2018 Seismological Society of Japan Fall Meeting(福島県郡山市)、2018 AGU (American Geophysical Union) Fall Meeting(米国・ワシントンDC)などの国際会議において発表を行ったほか、Springer社やElsevier社が発行する有力な学術誌にて論文を公表している。

  • Research Products

    (14 results)

All 2019 2018

All Journal Article (8 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 8 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] Dynamic Failure of Granular Slopes: Due to Unidirectional Stress Transfer or Multi-Dimensional Wave Propagation?2019

    • Author(s)
      Uenishi, K., and T. Goji
    • Journal Title

      Structural Integrity

      Volume: 印刷中 Pages: 2 pages

    • Peer Reviewed
  • [Journal Article] Individual Mechanical Interaction of Multiple Cracks and Its Relation with the Collective Behavior: Experimental Observations under Quasi-Static Loading Conditions2019

    • Author(s)
      Uenishi, K., Y. Fukuda, and N. Kame
    • Journal Title

      Proceedings of the Third International Conference on Structural Integrity and Durability

      Volume: 印刷中 Pages: 2 pages

    • Peer Reviewed
  • [Journal Article] Failure Patterns of Granular Slopes Subjected to Dynamic Impact: Experimental Observations2019

    • Author(s)
      Uenishi, K., and T. Goji
    • Journal Title

      Proceedings of the 2019 Rock Dynamics Summit in Okinawa

      Volume: 印刷中 Pages: 6 pages

    • Peer Reviewed
  • [Journal Article] Application of Rock Mechanics to Geophysical Problems of Earthquakes2018

    • Author(s)
      Uenishi, K.
    • Journal Title

      Rock Mechanics in Infrastructure and Resource Development

      Volume: Keynote 5 Pages: 6 pages

    • Peer Reviewed
  • [Journal Article] Dynamic Fracture and Wave Propagation in a Granular Medium: A Photoelastic Study2018

    • Author(s)
      Uenishi, K., and T. Goji
    • Journal Title

      Procedia Structural Integrity

      Volume: 13 Pages: 769-774

    • DOI

      10.1016/j.prostr.2018.12.127

    • Peer Reviewed / Open Access
  • [Journal Article] Dynamic Fragmentation of Ice Spheres: Two Specific Fracture Patterns2018

    • Author(s)
      Uenishi, K., T. Yoshida, I.R. Ionescu, and K. Suzuki
    • Journal Title

      Procedia Structural Integrity

      Volume: 13 Pages: 670-675

    • DOI

      10.1016/j.prostr.2018.12.111

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Collective Mechanical Behavior and Stability of a Group of Cracks in Brittle Solids2018

    • Author(s)
      Uenishi, K., Y. Fukuda, T. Yoshida, S. Sakaguchi, and I.R. Ionescu
    • Journal Title

      Structural Integrity

      Volume: 5 Pages: 244-245

    • DOI

      10.1007/978-3-319-91989-8_55

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Dynamic Fracture and Fragmentation of Ice Materials2018

    • Author(s)
      Uenishi, K., T. Hasegawa, T. Yoshida, S. Sakaguchi, and K. Suzuki
    • Journal Title

      Structural Integrity

      Volume: 5 Pages: 242-243

    • DOI

      10.1007/978-3-319-91989-8_54

    • Peer Reviewed
  • [Presentation] On the Mechanical Relation between Individual Interaction and Collective Behavior of Multiple Fault Sets Subjected to Quasi-Static Loading2019

    • Author(s)
      Uenishi, K.
    • Organizer
      Japan Geoscience Union Meeting 2019
    • Int'l Joint Research
  • [Presentation] Earthquake-Induced Dynamic Rupture in a Slope: Due to Mass Flow or Wave Propagation?2018

    • Author(s)
      Uenishi, K.
    • Organizer
      2018 Fall Meeting, American Geophysical Union
    • Int'l Joint Research
  • [Presentation] 固体材料の衝撃的破壊現象としての地震2018

    • Author(s)
      上西幸司
    • Organizer
      国立大学法人東京大学大学院新領域創成科学研究科学融合セミナー
    • Invited
  • [Presentation] Wave Propagation and Dynamic Rupture in a Granular Slope2018

    • Author(s)
      Uenishi, K.
    • Organizer
      2018 Seismological Society of Japan Fall Meeting
    • Int'l Joint Research
  • [Presentation] Multiple Cracks in Brittle Solids: Individual Mechanical Interaction versus Collective Behavior2018

    • Author(s)
      Uenishi, K.
    • Organizer
      2018 Seismological Society of Japan Fall Meeting
    • Int'l Joint Research
  • [Presentation] Wave and Rupture Propagation in a Brittle Solid Sphere2018

    • Author(s)
      Uenishi, K.
    • Organizer
      Japan Geoscience Union Meeting 2018
    • Int'l Joint Research

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Published: 2019-12-27  

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