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Development of a simplified geophysical exploration system for seismic hazard evaluations

Research Project

Project/Area Number 02555125
Research Category

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

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionTokyo Institute of Technology

Principal Investigator

TOKIMATSU Kohji  Tokyo Institute of Technology Associate Prof., 工学部, 助教授 (50134846)

Co-Investigator(Kenkyū-buntansha) YOSHIMI Yoshiaki  Shimizu Corporation Senior Advisor, 技術研究所, 技術顧問
MIDORIKAWA Saburoh  Tokyo Institute of Technology Associate Prof., 総合理工, 助教授 (00143652)
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1991: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1990: ¥3,400,000 (Direct Cost: ¥3,400,000)
KeywordsRayleigh wave / Geophysical exploration / Seismic hazard evaluation / Shear wave velocity / Earthquake / Liquefaction / Surface wave / 被害予測 / 地盤災害予測
Research Abstract

An improved version of Rayleigh wave method is presented for the determination of shear wave velocity (V_s) profiles of near surface soils. A dispersion curve and particle orbits of Rayleigh waves can readily be determined in the field through measurements of ground motions induced by an exciter using sensors placed on the ground surface. To determine Vs-profile from the dispersion curve, an inverse analysis is presented in which higher modes and amplitude ratios of particle orbits of Rayleigh waves are taken into account. To increase the effectiveness of the proposed method, desirable distances among the exciter and sensors are indicated. Comparative field tests are made at several sites using the proposed method and the conventional down hole method. The V_s-profiles from the two methods are in good agreement with each other, indicating the effectiveness of the proposed method.
Undrained cyclic triaxial tests are conducted using various sands under different confining pressures, to establish a relation between liquefaction resistance and shear wave velocity or elastic shear modulus. The test results together with those of previous studies indicate that the correlation depends on such factors as soil type and confining pressure. Elastic shear modulus is normalized with respect to minimum void ratio and confining pressure, and the test results are re-examined with this value. The normalized shear modulus has a good correlation with liquefaction resistance, irrespective of soil type and confining pressure.
Based on the above findings a simplified method is presented for evaluation liquefaction potential of sand deposits using shear wave velocity. Effectiveness of the proposed method is evaluated through field tests at various sites where field performance during earthquakes is known. The estimated results are reasonably consistent with the actual field behavior during the earthquakes, indicating that the proposed method is effective.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] Tokimatsu,K.: "Correlation between Liquefaction Resistance and Shear Wave Velocity" 土質工学会論文報告集. 30ー2. 33-42 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tokimatsu,K.: "Liquefaction Potential Evaluation based on Rayleigh Wave Investigation and its Comparison with Field Behavior" Proc..2nd Int.Conf.on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 1. 357-364 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tokimatsu,K.: "Vs Determination from Steady State Rayleigh Wave Method" 土質工学会論文報告集. 31ー2. 153-163 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 時松 孝次: "高次モ-ドと回転軌跡を考慮したレ-リ-波分散曲線の逆解析" 日本建築学会構造系論文報告集. 432. 97-103 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 時松 孝次: "木造家屋の震害とレ-リ-波探査により得られた地盤構造との関係" 第8回日本地震工学シンポジウム論文集. 49-54 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tokimatsu,K.: "Effects of Multiple Modes on Rayleigh Wave Dispersion Characteristics" J.Geotechnical Engineering,ASCE. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Correlation between liquefaction resistance and shear wave velocity" Soils and Foundations. 30, No. 2. 33-42 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Liquefaction potential evaluation based on Rayleigh wave investigation and its comparison with field behavior" Proc., 2nd Int. Conf. on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 1. 357-364 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "V_s determination from steady state Rayleigh wave method" Soils and Foundations. 31, NO. 2. 153-163 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Inversion of Rayleigh wave dispersion curve in consideration of higher modes and particle orbits" Journal of Struct. Constr. Engineering. AIJ.No. 432. 97-103 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Correlation of damage to wooden houses during earthquake with V_s-profiles determined by Rayleigh wave investigation" Proc. of The Eighth Japan Earthquake Engineering Symposium-1990. 49-54 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Effects of multiple modes on Rayleigh wave dispersion characteristics" Journal of Geotechnical Engineering ASCE.118, No. 10. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tokimatsu,K.: "Liquefaction Potential Evaluation based on Rayleigh Wave Investigation and its Comparison with Field Behavior" Proc.,2nd Int.Conf.on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics.1. 357-364 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Tokimatsu,K.: "Vs Determination from Steady State Rayleigh Wave Method" 土質工学会論文報告集. 31-2. 153-163 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 時松 孝次: "高次モ-ドと回転軌跡を考慮したレ-リ-波分散曲線の逆解析" 日本建築学会構造系論文報告集. 432. 97-103 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Tokimatsu,K.: "Effects of Multiple Modes on Rayleigh Wave Dispersion Characteristics" J.Geotechnical Engineering ASCE. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 時松 孝次: "S波速度構造同定のためのレ-リ-波探査システム(その3)" 第26回土質工学研究発表講演集. 1. 889-890 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] Kohiji Tokimatsu: "V_S Determination from Stady State Rayleigh wave Method" 土貭工学会論文報告集. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Kohji Tokimatsu: "Liquefaction Potential Evaluation based on Rayleigh Wave Investigation and its Comparison with Field Behavior" Proc.,2nd Int.Conf.on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics.(1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 時松 孝次: "レ-リ-波探査を用いた液状化危険度予測" 土と基礎. 38. 61-68 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 時松 孝次: "木造家屋の震害とレ-リ-波探査により得られた地盤構造との関係" 第8回日本地震工学シンポジウム論文集. 49-54 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 田村 修次: "高次モ-ドを考慮したレ-リ-波分散曲線の逆解析" 第26回土貭工学研究発表会. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 宮寺 泰生: "地盤内のレ-リ-波の挙動" 日本建築学会大会学術講演梗概集. 1555-1556 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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