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2000 Fiscal Year Final Research Report Summary

Disaster prevention work of coastal structure caused by vulnerated sand bed around coastal structure under attack of stormy wave

Research Project

Project/Area Number 11650529
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

MAENO Shiro  Okayama Univ., Dept. of Environmental and Civil Eng., Associate Professor, 環境理工学部, 助教授 (20157150)

Co-Investigator(Kenkyū-buntansha) GOTOH Hitoshi  Kyoto Univ., Dept. of Civil Eng., Associate Professor, 大学院・工学研究科, 助教授 (40243068)
NAGO Hiroshi  Okayama Univ., Dept. of Environmental and Civil Eng., Professor, 環境理工学部, 教授 (00034348)
Project Period (FY) 1999 – 2000
Keywordswater pressure variation / sand bed / liquefaction / buried submarine pipe / distinct element method / finite element method / back-filling sand of revetment / interaction of element
Research Abstract

It is well known that a cyclic transient liquefaction of sea bed occurs under wave motion. In this study, the mechanism of a disaster caused by the dynamic behavior of wave-structure interaction such as a floatation of a buried submarine pipeline, a flow out of back-filling sand behind a revetment and so on is investigated experimentally and theoretically.
1.A dynamic response of submarine pipeline buried in a sandy seabed under cyclic loading of water pressure is examined experimentally and theoretically. Characteristics of cyclic hydrodynamic forces acting on the buried pipeline is clarified by small scale laboratory tests, and a floatation process of the buried pipeline is also clarified by the method of discreet element analysis. A parametric study was carried out in order to investigate the influence of burial depth, specific weight of pipeline, permeability of sand bed, and frequency of pressure loading on the floatation of pipe. An analysis of the pipeline stability potential against floatation is presented, in which all the experimental test cases are verified.
2.A dynamic behavior of sand bed around revetment under cyclic loading of water pressure is investigated experimentally and theoretically. Flow out of back-filling sand is confirmed experimentally. Validity of the high permeable sand and the length of the revetment to reduce the amount of flow out of back-filling sand is clarified.
3.Flow out process of back-filling sand behind revetment is simulated by coupled analysis of distinct element method and finite element method. DEM-FEM analysis showed the flow out process of back-filling sand behind revetment under wave motion.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Shiro Maeno: "Floatation of Buried Pipeline under Cyclic Loading of Water Pressure"Proceedings of the 9th ISOPE Conf.Brest France. Vol.2. 217-225 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前野詩朗: "高波浪場における海岸堤防周辺地盤の動的挙動に関する研究"土木学会海岸工学論文集. 46. 961-965 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前野詩朗: "変動水圧場における海底埋設パイプラインの浮上限界に関する研究"土木学会海岸工学論文集. 46. 966-970 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前野詩朗: "変動水圧場における護岸裏込め土砂の流出限界に関する研究"土木学会海岸工学論文集. 47. 926-930 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前野詩朗: "護床工からの土砂の抜け出しに及ぼす変動水圧の影響に関する研究"土木学会水工学論文集. 45. 409-414 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 後藤仁志: "混相流モデルと個別要素法の融合による高濃度掃流層の数値解析"土木学会論文集. 649,II-51. 17-26 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 後藤仁志: "個別要素法によるrolling grain rippleの発生過程の数値シミュレーション"土木学会海岸工学論文集. 47. 481-485 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hitoshi GOTOH: "Behavior of bed-material particles as a granular material in a bed-load transport process"Journal of Hydroscience and Hydraulic Engineering. Vol.18,No.1. 141-151 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shiro MAENO: "Floatation of Buried Pipeline under Cyclic Loading of Water Pressure"Proceedings of the 9th ISOPE Conf. Brest France. Vol.2. 217-225 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiro MAENO: "Dynamic behavior of sand bed around coastal revetment under wave motion"Proceedings of Coastal Engineering, JSCE. Vol.46 (in Japanese). 961-965 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiro MAENO: "A study on the floatation limit of a buried submarine pipeline under cyclic loading of water pressure"Proceedings of Coastal Engineering, JSCE. Vol.46 (in Japanese). 966-970 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiro MAENO: "Flow out limit of back-filling sand of revetment under cyclic loading of water pressure"Proceedings of Coastal Engineering, JSCE. Vol.47 (in Japanese). 926-930 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shiro MAENO: "Effect of water pressure variation on sand removal from bed protection works"Annual Journal of Hydraulic Engineering, JSCE. Vol.45. 409-414 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hitoshi GOTOH: "Coupling of multiphase-flow model and distinct element method for simulation of sediment transport under high bottom shear"Journal of Hydraulic, Coastal and Environmental Engineering, JSCE. No.649, II-51 (in Japanese). 17-26 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hitoshi GOTOH: "Numerical Simulation of Generation of Rolling Grain Ripples by Using Distinct Element Method"Proceedings of Coastal Engineering, JSCE. Vol.47 (in Japanese). 481-485 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hitoshi GOTOH: "Behavior of bed-material as a granular material in a bed-load transport process"Journal of Hydroscience and Hydraulic Engineering. Vol.18, No.1. 141-151 (2000)

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

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Published: 2002-03-26  

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