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1998 Fiscal Year Final Research Report Summary

On Application of a Caisson with Suction to Breakwater Structure

Research Project

Project/Area Number 09650558
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionMaizuru National College of Technology

Principal Investigator

TAKATANI Tomiya  Maizuru National College of Technology Civil Engineering Associate Professor, 建設システム工学科, 助教授 (70179448)

Co-Investigator(Kenkyū-buntansha) MAENO Yoshi-hiko  Nihon University Civil Engineering and Environment Professor, 教授 (90110139)
Project Period (FY) 1997 – 1998
KeywordsCaisson with Suction / Breakwater / Irregular Wave / Pore Water Pressure / Wave Pressure Experiment / Pile Foundation / Dynamic Response Analysis
Research Abstract

To apply a steel caisson with skirt, which takes suction effect into the stability, to the coastal structure on soft seabed, dynamic responses of the caisson structure with suction and its soft foundation under wave attack were simulated by an advanced caisson structure-seabed interaction analysis. Also, the dynamic response of a caisson-type structure resting on pile foundation loaded by waves was numerically evaluated by FEM analysis in order to investigate the feasibility of a pile with an expanding end to support such offshore structure foundations.
The results obtained in this research is summarized as follows :
1) The displacement response at an estimating location under a caisson structure becomes small and the phase angle is large as the non-dimensional frequency wa/Vs and the depth z/a of an estimating location increases. Consequently, the displacement response of seabed under a caisson structure greatly depends on the skirt length of a caisson structure as seen in the displacement response of a caisson itself.
2) It is necessary to give careful consideration to the behavior of both the displacement and phase responses in case of installing a caisson structure with suction on the seabed, whose stiffness and shear wave velocity are small.
3) The dynamic response of pore water pressure under caisson has a maximum value in the vicinity of compartments, and also gradually decreases with the distance from the bottom of caisson increasing.
4) When a caisson is installed on a pile foundation, the displacement response in the seabed around the pile foundation, as well as that of the caisson, are almost similar regardless of the connecting condition between caisson and piles.
5) The pile foundation prevents the differential settlement in the seabed under a caisson, because the wave-induced pore water pressure beneath the caisson is distributed to the deep foundation around the expanding base.

  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Takatani,T.: "Dynamic Response of Caisson with Suction and Its Foundation Due to Wave" Proceedings of the 7th International Offshore and Polar Engineering Conference. Vol.1. 861-867 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前 野 賀 彦: "先端拡底抗の沿岸域への適用に関する一考案" 海洋開発論文集. Vol.13. 399-404 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高 谷 富 也: "潮位変動を受ける杭基礎の支持力特性について" 海洋開発論文集. Vol.13. 465-470 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高 谷 富 也: "潮位変動を受ける杭基礎およびその周辺地盤の応答特性について" 舞鶴工業高等専門学校紀要. No.33. 85-94 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高 谷 富 也: "先端拡底抗周辺地盤の応答特性に関する一考案" 舞鶴工業高等専門学校紀要. No.33. 95-105 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takatani,T.: "Application of Pile with Expandng Base to Foundation of Caisson Structure" Proceedings of the 8th International Offshore and Polar Engineering Conference. Vol.1. 578-584 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高 谷 富 也: "先端拡底抗基礎上のケーソン岸壁の地震時挙動に関する一考案" 海洋開発論文集. Vol.14. 71-76 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 高 谷 富 也: "先端拡底抗基礎上のケーソン防波堤の地震時応答について" 海洋工学論文集. 第45巻. 866-870 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takatani, T., Maeno, Y., Takahashi, S.and Shimosako, K.: "Dynamic Response of Caisson with Suction and Its Foundation Due to Wave" Proceedings of the 7th International Offshore and Polar Engineering Conferenc Honolulu. Vol.1. 861-867 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takatani, T., Maeno, Y., Takahashi, S.and Shimosako, K.: "On Application of Pile with Expanding End to Offshore Structure" Proceedings of Civil Engineering in the Ocean, JSCE. Vol.13. 399-404 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takatani, T., Maeno, Y.: "Bearing Capacity of Pile Foundation against Tide Level Change" Proceedings of Civil Engineering in the Ocean, JSCE. Vol.13. 465-470 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takatani, T: "Dynamic Response of Seabed around Pile Foundation due to Tide Level Change" Research Reports of Maizuru National College of Technology. No.33. 85-94 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takatani, T: "Dynamic Response of Seabed Ground around Pile with Expanding End" Research Reports of Maizuru National College of Technology. No.33. 95-105 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takatani, T., Maeno, Y., Kodama, H., Takahashi, S.and Shimosako, K: "Application of Pile with Expanding Base to Foundation of Caisson Structure" Proceedings of the 8th International Offshore and Polar Engineering Conference Montreal. Vol.1. 578-584 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takatani, T., Maeno, Y., Kodama, H: "Seismic Behavior of a Caisson Type Quay Wall Resting on Pile Foundation with Expanded Base" Proceedings of Civil Engineering in the Ocean, JSCE. Vol.14. 71-76 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takatani, T., Maeno, Y: "Seismic Behavior of a Caisson Type Breakwater on Pile Foundation with Expanded Base, Proceedings of Coastal Engineering in Japan, JSCE" Vol.45. 866-870 (1998)

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

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Published: 1999-12-08  

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