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Spatiotemporal Complexity of Three-Dimensional Dynamics of Planes of Weakness and Diversity of Fracture Patterns

Research Project

Project/Area Number 20K04680
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22030:Geotechnical engineering-related
Research InstitutionThe University of Tokyo

Principal Investigator

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

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords地震 / 地盤工学 / 動力学 / 破壊力学 / 防災
Outline of Research at the Start

平成30年9月の北海道胆振東部地震では道内全域停電のほか、大規模な土砂崩れが多数発生するなど、地震の発生の複雑性と関連する破壊現象の多様性について力学的により深く考察する必要があることがあらためて示された。これらの災害の多くは、断層面や節理面等のいわゆる地質学的不連続面の運動により引き起こされると考えられているが、本研究課題では、これまでの研究代表者の研究内容をさらに深化させ、三次元的に広がる不連続面の動力学の複雑性ならびに破壊の多様性に関わる諸現象を理論・数値解析、室内実験で再現するとともに、不連続面破壊に伴う近傍の構造物群の被災リスクを評価し、減災のための技術を提案することを目的とする。

Outline of Final Research Achievements

The complexity of the dynamic behavior of three-dimensional planes of weakness and the fracture diversity are considered through analyses and laboratory fracture experiments to try to evaluate the physical phenomena involved in fracture of planes of weakness, in particular, the diversity of phenomena of transition of quasi-static fracture to dynamic one. The relation between the collective behavior of pre-distributed groups of cracks and the mechanical interaction of individual cracks in brittle solid materials has been clarified. Also, it has been shown that the seemingly complex and disordered fracture behavior of groups of cracks in brittle solid materials can be understood in an orderly manner by considering the generated wave motion.

Academic Significance and Societal Importance of the Research Achievements

平成30年9月の北海道胆振東部地震では道内全域停電のほか、大規模な土砂崩れが多数発生するなど、地震の発生の複雑性と関連する破壊現象の多様性について力学的により深く考察する必要があることがあらためて示された。本研究で実施した理論・数値解析や室内実験を通し、多次元に広がる不連続面の動力学の複雑性ならびに破壊の多様性に関わる諸現象の学術的背景の一端が明らかとなったが、この研究成果は社会の防災・減災対策を考える上でも有用なものであると思われる。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 2021 2020

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (8 results) (of which Int'l Joint Research: 8 results)

  • [Journal Article] On the Multi-Dimensional Granular Dynamics and Stress Transfer under Impact of External Loading2023

    • Author(s)
      Uenishi, K., and D. Xi
    • Journal Title

      Rock Dynamics: Progress and Prospect

      Volume: 2

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Brittle Fracture Development through Sets of Preexisting Small-Scale Cracks under Quasi-Static and Dynamic Impact Loading2022

    • Author(s)
      Uenishi K.、Nagasawa K.
    • Journal Title

      Mechanics of Advanced Materials and Structures

      Volume: 印刷中 Issue: 18 Pages: 1-11

    • DOI

      10.1080/15376494.2022.2081748

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Global and Local Fracture Behavior in a Brittle Solid with a Set of Pre-Existing Small-Scale Cracks2022

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

      Procedia Structural Integrity

      Volume: 37 Pages: 397-403

    • DOI

      10.1016/j.prostr.2022.01.101

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Effect of Confinement and Material Heterogeneities on the Dynamics of a Granular Medium Subjected to Impact Loading2022

    • Author(s)
      Uenishi, K., and D. Xi
    • Journal Title

      Procedia Structural Integrity

      Volume: 37 Pages: 404-409

    • DOI

      10.1016/j.prostr.2022.01.102

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Dynamics of Dip-Slip Fault Rupture2021

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

      IOP Conference Series: Earth and Environmental Science

      Volume: 861 Issue: 4 Pages: 042085-042085

    • DOI

      10.1088/1755-1315/861/4/042085

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] On the Development and Dynamic Characteristics of Multiple Fracture Regions in a Brittle Solid2021

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

      Proceedings of the 15th Japan Symposium on Rock Mechanics

      Volume: - Pages: 495-498

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Dynamic fracture development in a multiply cracked solid2020

    • Author(s)
      Uenishi Koji、Fukuda Yuki、Nagasawa Kunihiro
    • Journal Title

      Procedia Structural Integrity

      Volume: 28 Pages: 2072-2077

    • DOI

      10.1016/j.prostr.2020.11.031

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Abrupt Vertical Shock Arising from Shallow Earthquakes2022

    • Author(s)
      Uenishi, K.
    • Organizer
      2022 Fall Meeting, American Geophysical Union
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dynamic Stress Transfer in a Layered Granular Slope2022

    • Author(s)
      Uenishi, K.
    • Organizer
      2022 Seismological Society of Japan Fall Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] What Actually is the Vertical Shock Verbally Reported for Shallow Earthquakes?2022

    • Author(s)
      Uenishi, K.
    • Organizer
      2022 Seismological Society of Japan Fall Meeting
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Existence of Weak Zones: Enhancing Dynamic Rupture or Not?2021

    • Author(s)
      Uenishi, K.
    • Organizer
      2021 Seismological Society of Japan Fall Meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] On the Dynamic Stability of a Granular Slope2021

    • Author(s)
      Uenishi, K.
    • Organizer
      2021 Seismological Society of Japan Fall Meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Rupture Absorbing Weak Zones2021

    • Author(s)
      Uenishi, K.
    • Organizer
      2021 Seismological Society of Japan Fall Meeting
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spatiotemporal Complexity of Rupture Evolution in a Fault Damage Zone with Multiple Small-Scale Cracks2020

    • Author(s)
      Uenishi, K.
    • Organizer
      2020 Seismological Society of Japan Fall Meeting
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Rupture Development in Fault Damage Zones Consisting of Sets of Preexisting Small-Scale Parallel Cracks2020

    • Author(s)
      Uenishi, K.
    • Organizer
      2020 Fall Meeting, American Geophysical Union
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-04-28   Modified: 2024-01-30  

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