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

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04680
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 22030:Geotechnical engineering-related
• Research Institution: The 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
• Keywords: 地震 / 地盤工学 / 動力学 / 破壊力学 / 防災

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.

Free Research Field

破壊動力学

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。