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1995 Fiscal Year Final Research Report Summary

DEVELOPMENT CENTRIFUGAL FLUID-WAVE GENERATING SYSTEMS

Research Project

Project/Area Number 06555141
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Geotechnical engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

SEKIGUCHI Hideo  Kyoto Univ., Faculty of Eng., Associate Professor., 工学部, 助教授 (20027296)

Co-Investigator(Kenkyū-buntansha) KOBAYASHI Shun-ichi  Kyoto Univ., Faculty of Eng., Research Associate, 工学部, 助手 (10243065)
KITA Katsutoshi  Kyoto Univ., Disaster Prevention Research Institute, Research Associate, 防災研究所, 助手 (60234225)
Project Period (FY) 1994 – 1995
KeywordsCentrifuge testing / Liquefaction / Seabed / Repeated load / Stormy wave / Pore pressure
Research Abstract

A fluid-wave generating system for use in geotechnical centrifuges has been developed, with the aim of providing a new research tool for investigating into wave-seabed interaction. The wave generating system developed in this research included a servo-motor driven flap-type wave generator, a wave tank, a wave absorber of vertical slotted wall construction, and a sediment trench. With this system it has proven possible to generate a range of nearly progressive waves in a wave tank, and to look at the response of sediments to passage of wave trains, under a prescribed steady-state centrifugal acceleration.
One of the important considerations was to select a fluid so as to facilitate the control of dynamic viscosity of the fluid, according to the level of the centrifugal acceleration imposed. This particular procedure was effective to meet simultaneously the requirements of similitude as to wave propagation as well as consolidation processes. The experimental program in this research consisted of two series of wave tests. The first series of experiments was concerned with wave tests over a "non-deforming" base and aim to assess the performance of the wave-absorbers with a range of structural parameters, such as the slotted area ratio and the length of a reservoir behind the wave absorber. It was found that under most favorable test conditions, the reflection coefficient of the wave absorbers was as low as 15%. The second series of experiments was concerned with nearly progressive wave tests with sandy sediments. The accumulation of excess pore pressures in the sediments due to wave action has clearly been observed, indicating the capability of this experimental system for investigating into wave-induced liquefaction or such other important physical processes.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 関口 秀雄: "遠心力場における進行波造波システムの開発" 海洋開発論文集,土木学会. 11. 7-12 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sekiguchi, H.: "Response of poro-clastoplastic beds to stading waves" Soils and Foundations. 35. 31-42 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sekiguchi, H.: "Dynamic response of strain-gauged pore pressure transducers" Proc. 1st Earthquake Geotech. Eng., Balkema. 2. 717-722 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sekiguchi, H.: "Generation of nearly progressive fluid waves in a centrifuge" Proc.of Civil Eng.in the Ocean, JSCE. Vol.11. 7-12 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sekiguchi, H.: "Response of poro-elastoplastic beds to standing waves" Soils and Foundations, JGS. Vol.35. 31-42 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sekiguchi, H.: "Dynamic response of strain-gauged pore pressure transducers" Proc.1st Earthquake Geotech.Engineering, Balkema. Vol.2. 717-722 (1995)

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

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Published: 1997-03-04  

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