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2001 Fiscal Year Final Research Report Summary

Hydro- and Soil- mechanical Study on Coastal Structure Damage due to Wave Motion and its Prevention

Research Project

Project/Area Number 12450202
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionOKAYAMA UNIVERSITY

Principal Investigator

NAGO Hiroshi  Okayama University, Faculty of Environmental Science and Technology, Professor, 環境理工学部, 教授 (00034348)

Co-Investigator(Kenkyū-buntansha) ZEN Kouki  Kyushu University, Graduate School of Engineering, Professor, 大学院・工学研究院, 教授 (50304754)
SEKIGUCHI Hideo  Kyoto University, Disaster Prevention Research Institute, Professor, 防災研究科, 教授 (20027296)
SAKAI Tetsuo  Kyoto University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (30026182)
Project Period (FY) 2000 – 2001
KeywordsWater Wave / Sea Bed / Liquefaction / Centrifuge Wave Test / Bank Protection / Riprap / Discontinuous Deformation Analysis / Distinct Element Method
Research Abstract

So many damages of coastal structures due to storm waves are reported every year. We considered that such failures of structure are mainly caused by the liquefaction of sea bed around the structure. In this research we treated such dynamical problem as the interaction problem of soil and water. The following results are obtained in this research.
1. The processes of progressive liquefaction, densification and re-liquefaction of loosely deposited sand bed under oscillating water pressure were clarified experimentally and theoretically for one-dimensional model. In the theoretical treatment the elasto-plastic model was adopted.
2. The centrifuge wave test with dynamical similarity was carried out. The liquefaction and densification process of sea bed were reproduced in the experiment. These processes were explained theoretically by two-dimensional elasto-plastic model. Further more, the dynamic behavior of sand and rock around the rubble mound breakwater were observed in this experiment.
3. The lift up of liquefied sand and the movement in the water were simulated numerically by the coupling of manifold method and discontinuous deformation analysis.
4. The effect of pore water pressure in the sand bed on the sediment transport was investigated. The increase of the sediment transport was explained by the numerical movable bed model.
5. The flow of back filling sand behind vertical sea wall was treated experimentally. The qualitative characteristics of flow were related to the water pressure variation and properties of material.
6. The validity of the counter measure to prevent the flow of back filling sand was shown by the field test.
7. Three-dimensional numerical model to analyze the movement of block in the liquefied sand layer was developed.
8. The local scour around bridge pier under the co-existence of wave and current is experimented. It is found that the amount of maximum scour depth becomes larger than the scour depth under the steady flow condition.

  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] Md.Faruque Mia, H.Nago: "Wave-induced dynamic behavior of bed material and local scour around a Circular bridge pier"Proc.12^<th> Congress of APD-IAHR. Vol.3. 791-802 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Md.Faruque Mia, H.Nago: "Prediction of bed liquefaction and local scour around a bridge pier under abrupt water pressure change"Proc, Int.Symposium on Scour and Foundations, ISSMGE, Melbourne. 23-37 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宮本順司, 佐々真志, 関口秀雄: "波浪による砂質地盤の液状化と流動変形過程"海岸工学論文集. 47巻. 921-925 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sekiguchi, H., Sassa, S., Sugioka, K., Miyamoto, J.: "Wave-induced liquefaction, flow deformation and particle transport in sand beds"Proc.Int.Conf.GeoEng2000, Melbourne. (CD-ROM). EG-0121 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yuezeng YU, Shiro MAENO, Hiroshi NAGO: "Progressive liquefaction process of loosely deposited sand bed under oscillating water pressure on its surface"J.Geotech.Eng., JSCE. No.680/III-55. 1-14 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Md.Faruque Mia, Akihiro TSUDA, H.Nago: "Dynamic behavior of bed material and local scour around circular bridge pier under wave and current"Annual J. of Hydraulic Eng., JSCE. Vol.46. 499-504 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Chen, G., Zen, K., Ohnishi, Y., Kasama, K.: "Extension of manifold method and its application"Proc.of 4^<th> international conference on analysis of discontinuous deformation. 439-450 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 陳 光済, 善 功企, 笠間清伸, 高松賢一: "波浪による海底地盤砂粒子挙動の数値シミュレーション"海岸工学論文集. 第48巻. 476-480 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 酒井哲郎, 後藤仁志, 原田英治, 羽間義晃, 井元康文: "波浪による海底地盤の液状化が漂砂量に及ぼす影響"海岸工学論文集. 第48巻. 981-985 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sassa, S., Sekiguchi, H.: "Analysis of wave-induced liquefaction of sand beds"Geotechnique. 51(2). 115-121 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sassa, S., Sekiguchi, H., Miyamoto, J.: "Analysis of progressive liquefaction as a moving-boundary problem"Geotechnique. 51(10). 847-857 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M. F. Mia and H. Nago: "Wave-induced dynamic behavior of bed material and local scour around a circular bridge pier"Proc., 12^<th> Congress of APD-IAHR. Vol. 3. 791-802 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. F. Mia and H. Nago: "Prediction of bed liquefaction and local scour around a bridge pier under abrupt water pressure change"Proc., Int. Symposium on Scour and Foundations, ISSMGE, Melbourne. 23-37 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Miyamoto, S. Sassa and H. Sekiguchi: "Wave-induced liquefaction and flow deformation in sand beds"Proc., Coastal Eng., JSCE. Vol. 47 (in Japanese). 921-925 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Sekiguchi, S. Sassa and J. Miyamoto: "Wave-induced liquefaction, flow deformation and particle transport in sand beds"Proc., Int. Conf., GeoEng, Melbourne. (CD-ROM). EG-0121 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y. Yu, S. Maeno and H. Nago: "Progressive liquefaction process of loosely deposited sand bed under oscillating water pressure on its surface"J. Geotech. Eng., JSCE. No. 680/III-55. 1-14 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G. Chen, K. Zen, Y. Ohnishi and K. Kasama: "Extension of manifold method and its application"Proc., 4^<th> Int. Conf. on analysis of discontinuous deformation. 439-450 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G. Chen, K. Zen, K. Kasama and K. Takamatsu: "Numerical simulation of the movement of sand particles under wave-induced seabed liquefaction"Proc., Coastal Eng., JSCE. Vol. 48 (in Japanese). 476-480 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Sakai, H. Gotoh, E. Harada, Y. Hama and Y. Imoto: "Effect of wave-induced liquefaction of seabed on sediment transport rate"Proc., Coastal Eng., JSCE. Vol. 48 (in Japanese). 981-985 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Sassa and H. Sekiguchi: "Analysis of wave-induced liquefaction of sand beds"Geotechnique. Vol. 51(2). 115-121 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S. Sassa, H. Sekiguchi and J. Miyamoto: "Analysis of progressive liquefaction as a moving boundary problem"Geotechnique. Vol. 51(10). 847-857 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M. F. Mia, A. Tsuda and H. Nago: "Dynamic behavior of bed material and local scour around circular bridge pier under wave and current"Annual J. Hydraulic Eng., JSCE. Vol. 46. 499-504 (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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