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LIQUEFACTION STRENGTH CHARACTERISTICS OF GARAVEL-CONTAINING SANDY SOILS UNDER LOWER NUMBERS OF CYCLES AND ELEVATED CONFINING PRESSURE

Research Project

Project/Area Number 08405035
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionTokyo University of Science

Principal Investigator

ISHIHARA Kenji  SCIENCE UNIVERSITY OF TOKYO, DEPARTMENT OF CIVIL ENGINEERING, PROFESSOR, 理工学部, 教授 (10010662)

Co-Investigator(Kenkyū-buntansha) TSUKAMOTO Yoshimichi  SCIENCE UNIVERSITY OF TOKYO, DEPARTMENT OF CIVIL ENGINEERING, RESEARCH ASSOCIATE, 理工学部, 助手 (50253505)
TOUHEI Terumi  SCIENCE UNIVERSITY OF TOKYO, DEPARTMENT OF CIVIL ENGINEERING, ASSOCIATE PROFESSOR, 理工学部, 助教授 (50246691)
MORICHI Shigaaki  SCIENCE UNIVERSITY OF TOKYO, DEPARTMENT OF CIVIL ENGINEERING, PROFESSOR, 理工学部, 教授 (50013173)
KUWANO Jiro  TOKYO INSTITUTE OF TECHNOLOGY, DEPARTMENT OF CIVIL ENGINEERING, ASSOCIATE PROFESSOR, 工学部, 助教授 (30178149)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥29,700,000 (Direct Cost: ¥29,700,000)
Fiscal Year 1997: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1996: ¥26,500,000 (Direct Cost: ¥26,500,000)
KeywordsCYCLIC STRENGTH OF SOILS / EARTHQUAKE MOTION / LIQUEFACTION / CYCLIC TRIAXIAL TEST
Research Abstract

Due to 1995 Hyogo-ken Nambu Earthquake (Hanshin-Awaji Earthquake Disaster), gravel-containing Masado soils at Kobe Port Island were extremely liquefied, which were considered to be less liquefiable than clean sand. This study shows the outcome of experimental investigations on liquefaction characteristics of Masado soils.
First, undrained monotonic compression as well as extension tests were carried out on reconstituted soil samples and intact soil samples recovered from Kobe Port Island. For reconstituted soil samples two different Masado soils having different gradations were used, and two different preparation methods of soil samples ***e adopted in this study. In the test series on reconstituted soil samples, the following experimental findings were found. Stress states at steady states of information are the same independent of sample preparation methods and confining pressures, in the void ratios of the soil samples are the same. The inclinations of the steady state envelopes for … More compressive and extensional loadings differ, accordingly, the deviator stresses at steady states for compressive and extensional loading are different. At states of phase transformation, mean effective stress achieved by the soil samples prepared by water sedimentation are lower those prepared by wet tamping. In the test series on intact soil samples, it was found that the intact soil samples shows mainly dilative behavior. The relationship between void ratios and mean effective stresses for the intact soil samples shows much scatter, probably due to a variation in gradations of the soil samples.
Then, large-scale triaxial test apparatus with a hydraulic actuator, which enables constant amplitude motions as well as random earthquake motions to be applied to soil samples, were installed, and a series of experiments were carried out. First, undrained cyclic tests were performed on dense Toyoura sand, and the test results were verified against the existing published test results. Then, undrained tests subject to the earthquake motions, which were recorded at the time of 1995 Hyogo-ken Nambu Earthquake, were performed on dense Toyoura sand, and the influence of the characteristics of strong motions, I e. impulse-type or vibration-type, was examined. Finally, undrained tests under constant-amplitude and earthquake motions were performed on Masado soils, and it was found that liquefaction strengths of Masado soils are lower than those of dense Toyoura sand at lower number of cycles, and the characteristics of earthquake motions have less influence on the liquefaction of Masado soils. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 野中・秋葉・関根・石原・金谷: "レキを含んだマサ土の非排水三軸圧縮・伸張せん断挙動"第32回地盤工学研究発表会講演集. 453-454 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 夏井・秋葉・州崎・野中・石原・塚本: "兵庫県南部地震の地震動波形を受ける密な砂の液状化特性とその評価"第33回地盤工学研究発表会講演集. 97-98 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 夏井・秋葉・州崎・野中・石原・塚本: "兵庫県南部地震の地震動波形を受ける密な砂の再液状化特性"土木学会第53回年次学術講演概要集. 154-155 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Ishihara,Cubrinouski&Nonaka: "Characterization of urdrained behavioar of soils in the reclaimed area of Kobe"Soils and Foundations,Special Issue No.2. 33-46 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tsukamoto,Ishihara&Nonaka: "Undrained deformation and strength characteristics of soils from reclaimaed deposit* in Kobe"Soils and Foundations,Special Issue No.2. 47-55 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] NONAKA,T., AKIBA,T.,SEKINE,M.,ISHIHARA,K. & KANATANI, M.: "UNDRAINED COMPRESSIVE AN DEXTENSIONAL BEHAVIOR OF GRAVEL-CONTAINING MASADO SOILS"32TH ANNUAL CONGRESS OF JAPANESE GEOTECHNCIAL SOCIETY. 453-454 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] NATSUI, H., AKIBA, T., SUZAKI,M., NONAKA,T., ISHIHARA,K. & TSUKAMOTO, Y.: "LIQUEFACTION CHARACTERISTICS OF DENSE SAND SUBJECT TO HYOGO-KEN NAMBU EARTHQUAKE"33TH ANNUAL CONGRESS OF JAPANESE GEOTECHNCIAL SOCIETY. 97-98 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] NATSUI, H., AKIBA, T., SUZAKI,M., NONAKA,T., ISHIHARA,K. & TSUKAMOTO, Y.: "RE-LIQUEFACTION CHARACTERISTICS OF DENSE SAND SUBJECT TO HYOGO-KEN NAMBU EARTHQUAKE"53TH ANNUAL CONGRESS OF JAPAN SOCIETY OF CIVIL ENGINEERS. 154-155 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] ISHIHARA, K., CUBRINOVSKI, M. & NONAKA, T.: "CHARACTERIZATION OF UNDRAINED BEHAVIOUR OF SOILS IN THE RECLAIMED AREA OF KOBE"SOILS AND FOUNDATIONS. SPECIAL ISSUE NO.2. 33-46 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] TSUKAMOTO, Y., ISHIHARA, K. & NONAKA, T.: "UNDRAINED DEFORMATION AND STENGTH CHARACTERISTICS OF SOILS FROM RECLAIMED DEPOSITS IN KOBE"SOILS AND FOUNDATIONS. SPECIAL ISSUE NO.2. 47-55 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 天満, 他: "粒度調整を行ったマサ土の非排水せん断変形・強度特性" 土木学会第51回年次学術講演会概要集第3部. A. 68-69 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 野中, 他: "レキを含んだまさ土の非排水せん断変形・強度特性" 第31回地盤工学研究発表会. 2分冊の1. 901-902 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] 野中, 他: "レキを含んだマサ土の非排水三軸圧縮・伸張せん断挙動" 第32回地盤工学研究発表会. 2分冊の1. 453-454 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 石原・吉田・加藤: "Characteristics of Lateral Spreading in Liquefied Deposits during the 1995 Hanshin-Awaji Earthquake" Journal of Earthquake Engineering. 1,1. 23-55 (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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