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Mechanism of river embankment collapse by overflow of river and water seepage

Research Project

Project/Area Number 16K06519
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Hydraulic engineering
Research InstitutionWaseda University

Principal Investigator

Sekine Masato  早稲田大学, 理工学術院, 教授 (60187854)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Keywords河川工学 / 水工水理学 / 移動床水理学 / 河川堤防の決壊 / 粘着性土の浸食 / 洪水 / 浸食 / 粘着性材料
Outline of Final Research Achievements

It was clarified experimentally that a noticeable difference appeared in the process of collapse according to the ratio of "gravel, sand, clay" constituting the embankment, and the elucidation of the mechanism was revealed considerably. When clay is contained enough to fill the gap of the gravel, erosion is suppressed because of the erosion resistance of clay, and the embankment becomes much more tenacious and difficult to collapse. In addition to clay and sand, when gravel is contained in a certain ratio, the effect of the interlocking between the gravel particles becomes noticeable, and the embankment collapse is difficult to cause. If clay is contained more than a certain ratio, the embankment becomes easier to deform. If the content ratio of the gravel is too large, the permeability of the entire material is increased and collapse by penetration. It is believed that the best ratio of mixture among "gravel, sand, and clay" exists for a tenacious embankment.

Academic Significance and Societal Importance of the Research Achievements

地球規模での気候変動と気象の極端化の影響により,記録的な豪雨が毎年のように発生しています.これに伴い,河川での堤防決壊も稀ではなく,2015年の鬼怒川の決壊に伴う大規模浸水を始め,国内のどこかで毎年のように甚大な被害に遭遇するようになりました.河川堤防は洪水による被害を食い止める最後の砦であるため,堤防を決壊し難い「粘り強い」ものとしていく必要があります.本研究によれば,堤防材料に占める「礫・砂・粘土」の比率に最適値が存在することが示され,現時点で言えば「3 : 4 : 3」がこれに当たるとの結論が得られました.これは,これまでに経験的に定めてきた指標に力学的な裏づけを与える結果と言えます.

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (16 results)

All 2018 2017

All Journal Article (6 results) (of which Peer Reviewed: 6 results,  Acknowledgement Compliant: 1 results) Presentation (10 results)

  • [Journal Article] 模擬河川堤防の決壊プロセスに及ぼす含有する砂礫・粘土の影響に関する検討2018

    • Author(s)
      関根正人・佐藤耕介・菅俊貴
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: Vol.74, No.5

    • NAID

      130007757719

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 河道湾曲部で発生する粘着性河床の変動プロセスに及ぼす掃流砂礫の影響2018

    • Author(s)
      関根正人・佐藤裕・芦澤穂波・吉川文崇
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: Vol.74, No.5

    • NAID

      130007757883

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 粘土河床上に配置した模擬巨石による砂礫の捕捉効果と河床変動プロセス2018

    • Author(s)
      関根正人・芦澤穂波・佐藤裕・吉川文崇
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: Vol.74, No.5

    • NAID

      130007757886

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 越流による模擬河川堤防の決壊プロセスに関する検討2018

    • Author(s)
      関根正人・堀江翼・佐藤耕介
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: Vol.74, No.4

    • NAID

      130007628130

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 砂礫の移動に起因する粘土河床の浸食促進・抑制効果と河床変動プロセス2018

    • Author(s)
      関根正人・池田憲昭・芦澤穂波・佐藤裕
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: Vol.74, No.4

    • NAID

      130007628136

    • Related Report
      2018 Annual Research Report 2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] 粘土を含有した模擬河川堤防の決壊プロセスに関する実験的検討2017

    • Author(s)
      関根正人・佐野正太・鈴木昌宏・堀江 翼
    • Journal Title

      土木学会論文集B1(水工学)

      Volume: Vol.73,No.4

    • NAID

      130006406334

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] 礫を含有する模擬堤防の越流決壊プロセス2018

    • Author(s)
      関根正人・菅俊貴・佐藤耕介
    • Organizer
      土木学会第73回年次学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 粘土河床上に配置した模擬巨石による河床変動と砂礫の捕捉効果2018

    • Author(s)
      関根正人・芦澤穂波・佐藤裕・吉川文崇
    • Organizer
      土木学会第73回年次学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 掃流砂の作用により生じる一様湾曲流路内の粘土河床の変動2018

    • Author(s)
      関根正人・佐藤裕・芦澤穂波・吉川文崇
    • Organizer
      土木学会第73回年次学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 掃流砂礫による粘土河床の浸食促進・抑制効果2018

    • Author(s)
      関根正人・吉川文崇・芦澤穂波・佐藤裕
    • Organizer
      土木学会第73回年次学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 堤防の土質構造の違いが決壊プロセスに及ぼす影響2017

    • Author(s)
      関根正人・佐藤耕介・堀江翼・佐野正太・鈴木昌宏
    • Organizer
      土木学会第72回年次学術講演会講演概要集第II部門
    • Place of Presentation
      九州大学伊都キャンパス
    • Year and Date
      2017-09-11
    • Related Report
      2016 Research-status Report
  • [Presentation] 掃流砂の移動に伴い生じる粘土河床の浸食促進・抑制効果2017

    • Author(s)
      関根正人・芦澤穂波・池田憲昭・佐藤 裕
    • Organizer
      土木学会第72回年次学術講演会講演概要集第II部門
    • Place of Presentation
      九州大学伊都キャンパス
    • Year and Date
      2017-09-11
    • Related Report
      2016 Research-status Report
  • [Presentation] 掃流砂の移動に伴う河道湾曲部の粘土河床の浸食現象2017

    • Author(s)
      関根正人・佐藤 裕・芦澤穂波・池田憲昭
    • Organizer
      土木学会第72回年次学術講演会講演概要集第II部門
    • Place of Presentation
      九州大学伊都キャンパス
    • Year and Date
      2017-09-11
    • Related Report
      2016 Research-status Report
  • [Presentation] 堤防の土質構造の違いが決壊プロセスに及ぼす影響2017

    • Author(s)
      関根正人・佐藤耕介・堀江翼・佐野正太・鈴木昌宏
    • Organizer
      土木学会第72回年次学術講演会
    • Related Report
      2017 Research-status Report
  • [Presentation] 掃流砂の移動に伴い生じる粘土河床の浸食促進・抑制効果2017

    • Author(s)
      関根正人・芦澤穂波・池田憲昭・佐藤裕
    • Organizer
      土木学会第72回年次学術講演会
    • Related Report
      2017 Research-status Report
  • [Presentation] 掃流砂の移動に伴う河道湾曲部の粘土河床の浸食現象2017

    • Author(s)
      関根正人・佐藤裕・芦澤穂波・池田憲昭
    • Organizer
      土木学会第72回年次学術講演会
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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