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Effect of sea-level change on ground instability of seawalls due to high waves

Research Project

Project/Area Number 17H03308
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionNational Institute of Maritime, Port and Aviation Technology

Principal Investigator

Takahashi Hidenori  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 (60371762)

Co-Investigator(Kenkyū-buntansha) 近藤 明彦  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, 主任研究官 (80755893)
森 信人  京都大学, 防災研究所, 教授 (90371476)
Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥13,000,000 (Direct Cost: ¥10,000,000、Indirect Cost: ¥3,000,000)
Fiscal Year 2020: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Keywords護岸 / 地盤 / 破壊 / 遠心模型実験 / 波浪 / 護岸の地盤 / 地盤工学 / 水工水理学 / 海岸工学
Outline of Final Research Achievements

Centrifuge model tests and numerical analyses, such as FEM and DEM, were utilized to investigate the mechanism of damage to seawalls caused by high waves. The influence of the water level in the ground, which is affected by the sea level rise, on the destabilization of the ground was also evaluated. As a result, it was clarified that the backwash destabilized the ground when the pore water was retained in the ground and the water level in the ground was high. Additionally, the seepage force in the ground was a factor of the ground destabilization, and the fluctuation of the seepage force might cause the loosening of the ground. Furthermore, based on the mechanism of ground instability, the countermeasure methods were proposed.

Academic Significance and Societal Importance of the Research Achievements

護岸の不安定化メカニズムや海面上昇の影響については,海岸護岸内部の地盤の安定性を評価する上で重要な情報となり,地盤の安定性を考慮した設計法の構築につながる。また,対策方法の提案は信頼性の高い護岸の構築を可能とする。

Report

(6 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Products Report
  • Research Products

    (6 results)

All 2022 2020 2019 2017

All Journal Article (6 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 6 results,  Open Access: 4 results)

  • [Journal Article] 高波による護岸での地盤破壊と安定性評価法2022

    • Author(s)
      高橋英紀
    • Journal Title

      港湾空港技術研究所報告

      Volume: 61 Pages: 3-33

    • Related Report
      Products Report
    • Peer Reviewed / Open Access
  • [Journal Article] Destabilisation of seawall ground by ocean waves2022

    • Author(s)
      Hidenori Takahashi, Lidija Zdravković,, Aikaterini Tsiampousi and Nobuhito Mori
    • Journal Title

      Géotechnique

      Volume: Ahead of print Issue: 8 Pages: 1-16

    • DOI

      10.1680/jgeot.21.00420

    • Related Report
      Products Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 波による地盤を含む護岸の不安定化に関する遠心模型実験2020

    • Author(s)
      高橋英紀
    • Journal Title

      港湾空港技術研究所報告

      Volume: 59 Pages: 31-50

    • NAID

      40022410455

    • Related Report
      2020 Annual Research Report Products Report
    • Peer Reviewed
  • [Journal Article] 2018 Typhoon Jebi post-event survey of coastal damage in the Kansai region, Japan2019

    • Author(s)
      Mori Nobuhito、Yasuda Tomohiro、Arikawa Taro、Kataoka Tomoya、Nakajo Sota、Suzuki Kojiro、Yamanaka Yusuke、Webb Adrean
    • Journal Title

      Coastal Engineering Journal

      Volume: 61 Issue: 3 Pages: 278-294

    • DOI

      10.1080/21664250.2019.1619253

    • Related Report
      2019 Annual Research Report Products Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Centrifuge modelling of breaking waves and seashore ground2019

    • Author(s)
      Hidenori Takahashi, Yoshiyuki Morikawa and Hiroaki Kashima
    • Journal Title

      International Journal of Physical Modelling in Geotechnics

      Volume: 19 Pages: 115-127

    • Related Report
      Products Report
    • Peer Reviewed / Open Access
  • [Journal Article] Centrifuge modelling of breaking waves and seashore ground2017

    • Author(s)
      Hidenori Takahashi, Yoshiyuki Morikawa and Hiroaki Kashima
    • Journal Title

      International Journal of Physical Modelling in Geotechnics

      Volume: 印刷中 Issue: 3 Pages: 115-127

    • DOI

      10.1680/jphmg.17.00037

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed

URL: 

Published: 2017-04-28   Modified: 2024-03-28  

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