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FUNDAMENTAL STUDY ON THE MITIGATION OF LIQUEFACTION INDUCED DISASTER BY INJECTING AIR BUBLLES IN THE GROUND

Research Project

Project/Area Number 18560490
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionChiba Institute of Technology

Principal Investigator

HATANAKA Munenori  Chiba Institute of Technology, FACULTY OF ENGINEERING, PROFESSOR (60333019)

Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,870,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2006: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywordssandy soils / countermeasure to liquefaction / degree of saturation / relative density / P-wave velocity / liquefaction strength / roundness / air bublle / 物理特性
Research Abstract

A series of laboratory tests were performed in order to investigate the effects of the size and the roundness of soil particles, relative density, and air bubbles involved in the pore water of sandy soils on the relationship between the degree of saturation (Sr) and the P-wave velocity (V_p). The effect of degree of saturation on the liquefaction strength of sand was studied both on the undisturbed and reconstituted samples. The methods to generate air bubble and to insert the air bubble into the ground were also studied using model sand ground.
Following were concluded : (1) Unlike the effect of the size of soil particles of sand on the B-value-V_p relationship, its effect on the Sr-V_p relationship is small. The P-wave velocity increases rapidly with increasing degree of saturation from 90 % to 100 % for all sands tested ; (2) The effects of relative density on the Sr-V_p relationship are negligible ; (3) The effects of air bubbles involved in pore water both on B-value-V_p relationship and Sr-V_p relationship are significant ; (4) By comparing the liquefaction strengths obtained in the undrained cyclic triaxial tests on Futtsu sand, the method to decrease the degree of saturation by injecting the air bubbles into the sandy ground is expected to be a useful method to decrease the disasters induced by the sand liquefaction. (5) A simple method to unsaturate sand ground was successfully performed based on model ground test by inserting air bubble dissolved water into the ground under some water head.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (18 results)

All 2008 2007 2006

All Journal Article (10 results) (of which Peer Reviewed: 5 results) Presentation (8 results)

  • [Journal Article] A study on the engineering properties of sand improved by the sand compaction pile method2008

    • Author(s)
      M.Hatanaka, F.Lei, N.Matsumura and Y.Hiroki
    • Journal Title

      Sods and Foundahons Vol.1,No.1

      Pages: 73-85

    • NAID

      110007327318

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Experunental study on the relationship between degree of saturation and P-wave velocity in sandy soils2008

    • Author(s)
      M.Hatanaka and T.Masuda
    • Journal Title

      Proc.of 2nd International Conference on Geotech-nical Engineering for Disaster Mitigation and Re-habilitation Vol.1

      Pages: 346-351

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] A study on the engineering properties of sand improved by the sand compaction pile method2008

    • Author(s)
      M, Hatanaka, F, Lei, N, Matsumura, Y, Hiroki
    • Journal Title

      Soils and Foundations 48, 1

      Pages: 73-85

    • NAID

      110007327318

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Experimental study on the relationship between degree of saturation and P-wave velocity for sandy soils2008

    • Author(s)
      M, Hatanaka, T, Masuda
    • Journal Title

      Proceedings of 2^<nd> International Conference on Geotechnical Engineering for Disaster Mitigation & Rehabilitation 1

      Pages: 346-351

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A study on the engineering properties of sand improved by the sand compaction pile method2008

    • Author(s)
      M.Hatanaka, F.Lei, N.Matsumura and Y. Hiroki
    • Journal Title

      Soils and Foundations Vol.48

      Pages: 73-85

    • NAID

      110007327318

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] An experimental Study on the relationship between degree of saturation and P-wave velocity for sandy soils2008

    • Author(s)
      M.Hatanaka and T.Masuda
    • Journal Title

      Proceedings of 2^<nd> International Conference on Geotechnical Engineering for Disaster Mitigation & Rehabilitation (印刷中)(未定)

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] 砂地盤の飽和度とP波速度の関係についての実験的研究2007

    • Author(s)
      畑中宗憲, 増田剛美, 鈴木裕大
    • Journal Title

      第42回地盤工学研究発表会梗概集 (未定)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Estimating relative density of sandy soils2006

    • Author(s)
      M.Hatanaka and F.Lei
    • Journal Title

      Sods and Foundations Vol.46,No.3

      Pages: 299-313

    • NAID

      110004740393

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Estimating relative density of sandy soils2006

    • Author(s)
      M, Hatanaka, F, Lei
    • Journal Title

      Soils and Foundations 46, 3

      Pages: 299-313

    • NAID

      110004740393

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Effect of degree of saturation on the liquefaction strength of in-situ sandy soils2006

    • Author(s)
      M.Hatanaka, T.masuda, A.abe
    • Journal Title

      Proc. of 4^<th> Asian Joint Symposium on Geotechnical and Geo-Environmental Engineering, Dalin, China

      Pages: 69-62

    • Related Report
      2006 Annual Research Report
  • [Presentation] 砂地盤の飽和度と液状化強度の関係に及ぼす相対密度と粒形の影響2008

    • Author(s)
      畑中 宗憲、増田 剛美、木村 丹美、島田 聡行
    • Organizer
      第43回地盤工学研究発表会
    • Place of Presentation
      広島
    • Year and Date
      2008-07-10
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Effects of relative density and particle shape on the relationship between the degree of saturation and liquefaction strength2008

    • Author(s)
      M, Hatanaka, T., Masuda, A, Kimura, T, Shimada
    • Organizer
      The 43^<rd> Annual meeting of JGS(to be published)
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A study on the engineering properties of sand unproved by the sand compaction pile method2007

    • Author(s)
      M.Hatanaka, N.Matsumura and Y.Hiroki
    • Organizer
      Proc.of 13th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, Kolkata
    • Place of Presentation
      Kolkata
    • Year and Date
      2007-12-13
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] 砂地盤の飽和度とP波速度の関係についての実験的研究2007

    • Author(s)
      畑中 宗憲、増田 剛美、鈴木 裕大
    • Organizer
      第42回地盤工学研究発表会
    • Place of Presentation
      名古屋
    • Year and Date
      2007-07-06
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] A study on the engineering properties of sand improved by the sand compaction pile method2007

    • Author(s)
      M, Hatanaka, N, Matsumura, Y, Hiroki
    • Organizer
      Proc. of 13^<th> Asian Regional JConference on Soil Mechanics and Geotechnical Engineering
    • Place of Presentation
      Kolkata, ndia
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Experimental study on the relationship between the degree of saturation and P-wave velocity2007

    • Author(s)
      M, Hatanaka, T, Masuda, Y, Suzuki
    • Organizer
      The 42^<nd> Annual meeting of JGS
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Effect of degree of saturation on the liquefaction strength of in-situsandy soils2006

    • Author(s)
      M.Hatanaka, T.masuda and A.abe
    • Organizer
      Proc.of 4th Asian Joint Symposium on Geotechni-cal and Geo-Environmental Engineering
    • Place of Presentation
      大連
    • Year and Date
      2006-12-19
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Effect of degree of saturation on the liquefaction strength of in-situ sandy soils2006

    • Author(s)
      M, Hatanaka, T, Masuda, A, Abe
    • Organizer
      Proc. of 4^<th> Asian Joint Symposium on Geotechnical and Geo-Environmental Engineering
    • Place of Presentation
      Dalin, China
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2006-04-01   Modified: 2016-04-21  

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