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Development of embankment erosion model considering effect of cohesive soil on critical non-dimensional shear stress

Research Project

Project/Area Number 26820197
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Hydraulic engineering
Research InstitutionSaitama University

Principal Investigator

YAGISAWA Junji  埼玉大学, 理工学研究科, 准教授 (70549998)

Project Period (FY) 2014-04-01 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords粘性土 / 移動限界 / 含水比 / 細砂含有率 / 侵食限界 / 不飽和土 / 限界無次元掃流力 / サクション / 堤防形状
Outline of Final Research Achievements

For preventing the embankment breaching, to elucidate erosion mechanism of the embankment is quite important. In previous research, erosion characteristics of cohesive soil has been investigated by changing water content. However, water content of embankment in vertical direction should be changed at the flood event. Therefore, the objective of this study is to elucidate the effect of vertical distribution of water content of cohesive soil on non-dimensional critical shear stress by conducting flume experiment.
In the experiment, well-mixed fine sand and O.A. Clay were used as cohesive soils. Initial water content of cohesive soil was set around 30%. Four water content sensors set at 1cm (L1), 2cm (L2), 4cm (L3) and 8cm (L4) from the initial surface respectively. As a result of experiment, water content was increased only L1 layer. Non-dimensional critical shear stress of cohesive soils decreased with increasing the water content gradient between L1 and L2 layer.

Report

(3 results)
  • 2015 Annual Research Report   Final Research Report ( PDF )
  • 2014 Research-status Report
  • Research Products

    (5 results)

All 2016 2015

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results,  Acknowledgement Compliant: 2 results) Presentation (3 results)

  • [Journal Article] Geometrical characteristic of scour holes caused by overtopping flow of embankment covered with different lengths of protection works2015

    • Author(s)
      Doan Van Binh, Sazia Afreen, Junji Yagisawa, Norio Tanaka
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser.B1(Hydraulic Engineering)

      Volume: 71

    • NAID

      40020430750

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Investigation of scouur pattern downstream of levee toe due to overtopping flow2015

    • Author(s)
      Sazia Afreen, Junji Yagisawa, Doan Van Binh, Norio Tanaka
    • Journal Title

      Journal of Japan Society of Civil Engineers, Ser.B1(Hydraulic Engineering)

      Volume: 71

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Presentation] 含水比の鉛直分布が粘性土の移動限界に及ぼす影響2016

    • Author(s)
      八木澤順治
    • Organizer
      土木学会平成27年度年次学術講演会
    • Place of Presentation
      東京都市大学(東京都・世田谷区)
    • Year and Date
      2016-03-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] 含水比及び細砂含有率が粘性土の移動限界に与える影響2015

    • Author(s)
      八木澤順治
    • Organizer
      平成27年度土木学会全国大会
    • Place of Presentation
      岡山大学 (岡山県・岡山市)
    • Year and Date
      2015-09-16 – 2015-09-18
    • Related Report
      2014 Research-status Report
  • [Presentation] 含水比及び細砂含有率が粘性土の移動限界に与える影響2015

    • Author(s)
      八木澤順治
    • Organizer
      土木学会平成27年度年次学術講演会
    • Place of Presentation
      岡山大学(岡山県・岡山市)
    • Year and Date
      2015-09-16
    • Related Report
      2015 Annual Research Report

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Published: 2014-04-04   Modified: 2017-05-10  

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