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Mechanism of tsunami-induced erosion of bridge-abutment backfill and effectiveness of countermeasures

Research Project

Project/Area Number 18K04364
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 22040:Hydroengineering-related
Research InstitutionNagoya University

Principal Investigator

Nakamura Tomoaki  名古屋大学, 工学研究科, 准教授 (90569328)

Co-Investigator(Kenkyū-buntansha) 水谷 法美  名古屋大学, 工学研究科, 教授 (10209760)
趙 容桓  名古屋大学, 工学研究科, 助教 (00761082)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords津波 / 橋台 / 盛土 / 侵食 / 洗掘 / 津波対策 / 耐津波安定性 / 対策
Outline of Final Research Achievements

The mechanism of tsunami-induced erosion of bridge-abutment backfill and effectiveness of countermeasures were investigated using hydraulic experiments and numerical simulations. Experimental results showed that the backfill close to the abutment was eroded and the backfill on the far side of the abutment remained relatively intact, which was a similar phenomenon to that observed after the 2011 Tohoku earthquake tsunami. From comparison with experimental data, the computational capability of the numerical model, FS3M, was demonstrated in terms of water surface fluctuation and surface profile change in the backfill. From numerical results, the process in which the backfill inside the abutment flowed out from under the landward wing was observed and the mechanism of the process was revealed in terms of bedload and suspended load transport. From numerical experiments, an increase in the soil-cover depth of the wing would be effective against the erosion of the backfill.

Academic Significance and Societal Importance of the Research Achievements

本研究では,従来あまり着目されてこなかった津波による橋台背面盛土の流出現象を対象とした水理実験と数値計算をともに実施し,橋台背面盛土流出の過程と機構を明らかにした点に学術的な意義がある.また,本研究で取り扱った現象に対する数値計算モデルFS3Mの妥当性が確認でき,橋台の形式,盛土の形状や粒径,立地など橋ごとの特徴を考慮した盛土流出の評価が行えるようになったことから,実務への展開も期待される.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (7 results)

All 2021 2020 2019

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (4 results)

  • [Journal Article] Modeling Tsunami-Induced Erosion of Bridge-Abutment Backfill2020

    • Author(s)
      Nakamura Tomoaki、Nakai Yuto、Cho Yong-Hwan、Mizutani Norimi
    • Journal Title

      Journal of Marine Science and Engineering

      Volume: 8 Issue: 11 Pages: 922-922

    • DOI

      10.3390/jmse8110922

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] NUMERICAL SIMULATION OF TSUNAMI SCOUR AT LANDWARD TOE OF COASTAL DIKE AND EVALUATION OF EFFECTIVENESS OF GABIONS2019

    • Author(s)
      中村友昭,谷口淳也,趙 容桓,水谷法美
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)

      Volume: 75 Issue: 2 Pages: I_703-I_708

    • DOI

      10.2208/kaigan.75.I_703

    • NAID

      130007730324

    • ISSN
      1883-8944, 1884-2399
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] EXPERIMENTAL STUDY ON EFFECTIVENESS OF GABIONS AGAINST TSUNAMI SCOUR AT LANDWARD TOE OF COASTAL DIKE2019

    • Author(s)
      中村友昭,谷口淳也,趙 容桓,水谷法美
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

      Volume: 75 Issue: 2 Pages: I_749-I_754

    • DOI

      10.2208/jscejoe.75.I_749

    • NAID

      130007725052

    • ISSN
      2185-4688
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 津波による橋台背面盛土の侵食機構と侵食対策の有効性に関する一考察2021

    • Author(s)
      杉山知里,中村友昭,趙 容桓,水谷法美
    • Organizer
      令和2年度土木学会中部支部研究発表会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 陸上遡上津波による橋台背面盛土の侵食と舗装の影響に関する一考察2020

    • Author(s)
      中井祐斗,中村友昭,趙 容桓,水谷法美
    • Organizer
      令和元年度土木学会中部支部研究発表会
    • Related Report
      2019 Research-status Report
  • [Presentation] 越流津波による海岸堤防裏法尻の洗掘に関する数値シミュレーション2019

    • Author(s)
      中村友昭,谷口淳也,趙 容桓,水谷法美
    • Organizer
      混相流シンポジウム2019
    • Related Report
      2019 Research-status Report
  • [Presentation] 越流した津波による洗掘に蛇籠工が与える効果の実験的研究2019

    • Author(s)
      谷口淳也,中村友昭,趙 容桓,水谷法美
    • Organizer
      平成30年度土木学会中部支部研究発表会
    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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