Investigation on mechanical properties of concrete subjected to water pressure and external forces

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01405
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 22010:Civil engineering material, execution and construction management-related
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Iwanami Mitsuyasu 東京工業大学, 環境・社会理工学院, 教授 (90359232)
• Co-Investigator(Kenkyū-buntansha): 川端 雄一郎 国立研究開発法人海上・港湾・航空技術研究所, 港湾空港技術研究所, グループ長 (10508625) ; 笠谷 貴史 国立研究開発法人海洋研究開発機構, 海洋機能利用部門(海底資源センター), センター長代理 (90373456)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 大水深海域 / コンクリート / 水圧作用 / 外力作用 / 水の移動

Outline of Final Research Achievements

In this study, water pressure confinement loading tests were conducted on concrete using an experimental device capable of applying external forces under high water pressure in addition to elemental experiments using an existing high water pressure loading device. By tracking the progress of microcracks in the concrete using X-ray CT scans, the difference in mechanical behavior was made clear when concrete is subjected to external forces under atmospheric conditions. Furthermore, in order to verify the validity of the findings obtained from these laboratory tests, in-situ loading tests were conducted on concrete on the deep seabed, investigating the characteristics of stress, deformation, and damage that occur in the concrete under high water pressure. There are no examples of such loading tests on concrete on the deep seabed anywhere in the world, and extremely valuable academic findings were obtained from this study.

Free Research Field

コンクリート工学

Academic Significance and Societal Importance of the Research Achievements

今後、大水深海域の広範な利活用が強く期待されている中、このような海洋開発を実現させるためのインフラ整備に必要な高水圧作用を受けるコンクリート構造物の設計・施工方法の確立に資する有用な知見を得ることができた。