• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

1993 Fiscal Year Final Research Report Summary

THE MODELLING OF THE GENERATION AND DISSIPATION EXCESS POREWATER PRESSURE IN SEABED SEDIMENTS UNDER WAVE ACTIONS

Research Project

Project/Area Number 03650397
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionDEPARTMENT OF URBAN AND CIVIL ENGINEERING, SCHOOL OF ENGINEERING, IBARAKI UNIVERSITY

Principal Investigator

YASUHARA Kazuya  PROFESSOR, DEPT.OF URBAN & CIVIL ENG., IBARAKI UNIV., 工学部・都市システム工学科, 教授 (20069826)

Co-Investigator(Kenkyū-buntansha) SATOH Ken-ichi  RESEARCH ASSISTANT, DEPT.OF URBAN & CIVIL ENG., IBARAKI UNIV., 工学部・都市システム工学科, 助手 (20235336)
HYODO Masayuki  ASSOCIATE PROFESSOR, DEPT.OF CIVIL ENG., YAMAGUCHI UNIV., 工学部・社会建設工学科, 助教授 (40130091)
MIMURA Nobuo  ASSOCIATE PROFESSOR, DEPT.OF URBAN & CIVIL ENG., IBARAKI UNIV., 工学部・都市システム工学科, 助教授 (60133089)
Project Period (FY) 1991 – 1993
KeywordsCohesive sediment / Pore water pressure / Wave action / Siltation / Settlement / Strength / Instability / 安定解析
Research Abstract

The following subjects in the cohesive coastal sediments are included in the scope of the present research :
1) Siltation induced by wave actions leading to the contamination of sea water as an important environmental problem for ports and harbors.
2) Settlement and instability of breakwaters founded on soft normally consolidated clay.
From the geotechnical point of view, a study of wave-induced cyclic loading and the associated effective stress regime in sediments is relevant to both of the above topics. To carry this out, the precise measurement or prediction of excess pore water pressures in coastal sediments is essential. The following conclusions were derived from a recent study :
1) Based on the diffusion type of defferential equation including a term for sedimentation, a numerical model was established to evaluate the distribution of void ratio in coastal cohesive sediments under wave actions. The effect of interation between waves and silt was taken into consideration for the erosion flux. The numerical experiments were carried out under various intial conditions. The results indicate that the model is capable of predicting the approximate distribution and change of void ratio against depth during and after the sedimentation of silt.
2) A model combined with Terzaghi's three dimensional consolidation theory and an empirical relation formulated from the results of undrained cyclic triaxial tests was proposed to predict the behavior of clay under partially drained cyclic triaxial tests as boundary value problem. It was also suggested that this model could estimate the long-term settlement and instability of a breakwater founded on cohesive seabed sediments under stormy conditions.

  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Yasuhara,K.et al.: "Cyclic-induced settlement in soft clays" Proc 10th European Conf.SMFE(第10回ヨーロッパ地域土質・基礎工学会議事録). 1. 887-890 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yasuhara,K.,K.Hirao and A.F.L.Hyde: "Effects of cyclic loading on undrained strength and compressibility of clay" SOILS AND FOONDATIONS(土質工学会英文論文集). 32. 100-116 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hyodo,M.,K.Yasuhara and K.Hirao: "Prediction of Clay behaviour in undrained and partially drained cyclic triaxial tests" SOILS AND FOONDATIONS(土質工学会英文論文集). 32. 117-127 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三村信男・五明美智男: "現地不攪乱底泥の強度特性" 海岸工学論文集. 39. 501-505 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 佐藤研一 他: "An analysis of wave-induced settlement and pore pressure in seabed Clay" Proc.11th Southeast Asian Geotechnical Conference(第11回東南アジア土質工学会議録). 1. 475-480 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三村信男: "Rates of erosion and deposction of cohesive under wave action" Nearshore and Estuarine Cohesive Sediment Transport. 247-264 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yasuhara, K.and K.H.Andersen: "Recompression of normally consolidated clay after cyclic loading, Soils and Foundations" vol.32, No.4. 89-94 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasuhara, K.et al.: "Behavior of anisotropically consolidated undisturbed clay in cyclic triaxial tests with drainage" Proc.JSCE. vol.436 /III-17. 1-8

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasuhara, K.et al.: "Clay behavior under consequtive long-term cyclic loading in direct-simple shear tests" Proc.of JSCE. No.439/III-17 (in Japanese). 9-16 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasuhara, K., M.Hyodo, and A.F.L.Hyde: "Cyclic-induced settlement in soft clays" Proc.10th European Conf.SMFE. vol.1(in Japanese). 887-890 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mimura, N.et al.: "Assessment for influences of sea level rise and changes in hydrographic phenomena due to grobal warming (in Japanese)" Proc.Coastal Eng.in Japan. vol.38. 936-940 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasuhara, K., K.Hirao and A.F.L.Hyde: "Effects of cyclic loading on undrained strength and compressibilty of clay" Soils and Foundations. Vol.32, No.1. 100-116 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hyodo, M., K.Yasuhara and K.Hirao: "Prediction of clay behavior in undrained and partially drained cyclic triaxial tests" Soils and Founda-tions. Vol.32, No.4. 117-127 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Gomyo, M.and N.Mimura: "Strength characteristics of in-situ undisturbed seabed silt(in Japanese)" Proc.Coastal Eng.in Japan. Vol.39. 502-505 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Satoh, K., K,Yasuhara and M,Hyodo: "An analysis of wave-induced settlement and pore pressure in seabed clay" Proc.11th Southeast Asian Geotechnical Conf.Vol.1. 475-480 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mimura, N.: "Rates of erosion and deposition of cohesive sediment under wave action" Journal of Nearshore and Estuarine Cohesive Sediment Transport. 247-264 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yasuhara, K.: "Post-cyclic degradation and recovery in undrained strenght in clay" Proc.13th Intn'1 Conf.SMFE. TC-4 Report Vo1. 143-148 (1994)

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

URL: 

Published: 1995-03-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi