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Estimation method for validation of liquefaction strength considering aging effects and its verification tests

Research Project

Project/Area Number 17H03302
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionNagaoka University of Technology

Principal Investigator

Toyota Hirofumi  長岡技術科学大学, 工学研究科, 准教授 (90272864)

Co-Investigator(Kenkyū-buntansha) 杉本 光隆  長岡技術科学大学, 工学研究科, 教授 (50196755)
原 忠  高知大学, 教育研究部自然科学系理工学部門, 教授 (80407874)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2019: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Keywords液状化 / 年代効果 / せん断波速度 / 三軸試験 / 砂質土 / 原位置試験
Outline of Final Research Achievements

It has been well known that liquefaction potential of the ground is increased with an increase of construction or sedimentation ages. However, the mechanism of this aging effect on liquefaction has not been elucidated.
To clarify the mechanism of aging effect in sand, liquefaction resistance, secant shear modulus including G0 and penetration resistance of long-term consolidated sand were respectively measured using undrained cyclic triaxial test, local small strain (LSS) test, bender element (BE) test and static penetration test. Liquefaction resistances obtained from the triaxial test and the static penetration test were respectively increased by about 15% and 7% in one year consolidated specimen. However, G0 was scarcely changed with the consolidation time. The difference is that elastic strain region, where linear elastic behavior was exhibited, tend to extend to larger strain for long-term consolidated specimen.

Academic Significance and Societal Importance of the Research Achievements

液状化抵抗が圧密時間とともに増加するメカニズムについて,力学特性の変化に着目して研究を行った.その結果,初期せん断剛性率や貫入抵抗(せん断強さと関係)についての変化は小さく,主に線形弾性を示すひずみ領域が拡大することによって,液状化抵抗が増加することを明らかにした.つまり,実際の地盤の年代効果を考慮した液状化抵抗の変化を評価するためには,地盤のせん断弾性波や貫入抵抗値を測定するだけでは不十分で,弾性ひずみ領域の拡大を推定する必要がある.しかしながら,これは難しいため,初期せん断剛性率ではなく,ダイラトメータ等により,もう少しひずみの大きいところの割線せん断剛性率を測定する方法が推奨される.

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (15 results)

All 2019 2018 2017

All Journal Article (6 results) (of which Peer Reviewed: 4 results) Presentation (8 results) Book (1 results)

  • [Journal Article] Estimation of reliquefaction considering from soil element tests2019

    • Author(s)
      Toyota Hirofumi、Takada Susumu、Le Bao Ngoc
    • Journal Title

      Japanese Geotechnical Society Special Publication

      Volume: 6 Issue: 2 Pages: 53-60

    • DOI

      10.3208/jgssp.v06.GIZ08

    • NAID

      130007629792

    • ISSN
      2188-8027
    • Year and Date
      2019-04-30
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effects of gravel content on liquefaction resistance and its assessment considering deformation characteristics in gravel ? mixed sand2019

    • Author(s)
      Toyota Hirofumi、Takada Susumu
    • Journal Title

      Canadian Geotechnical Journal

      Volume: 56 Issue: 12 Pages: 1743-1755

    • DOI

      10.1139/cgj-2018-0575

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reliquefaction and Aging Effects on Liquefaction Estimated from Triaxial Tests2018

    • Author(s)
      Toyota, H., and Takada, S.
    • Journal Title

      International Conference for the Decade Memory of the Wenchuan Earthquake

      Volume: Session S3-1-3 Pages: 77-84

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Estimation of reliquefaction considering from soil element tests2018

    • Author(s)
      Toyota, H., Takada, S. and Le, B. N.
    • Journal Title

      International Conference on GIS and Geoinformation Zoning for Disaster Mitigation

      Volume: 1 Pages: 135-142

    • NAID

      130007629792

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Resilience Efforts in the Kochi Prefecture in Preparation for the Nankai Trough Earthquake2017

    • Author(s)
      Hara, T.
    • Journal Title

      Journal of Disaster Research

      Volume: 12 Issue: 4 Pages: 755-765

    • DOI

      10.20965/jdr.2017.p0755

    • NAID

      130008128081

    • ISSN
      1881-2473, 1883-8030
    • Year and Date
      2017-08-01
    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Variation of liquefaction strength induced by monotonic and cyclic loading histories2017

    • Author(s)
      Toyota, H. and Takada, S.
    • Journal Title

      Journal of Geotechnical and Geoenvironmental Engineering, ASCE

      Volume: 143 Issue: 4 Pages: 1-11

    • DOI

      10.1061/(asce)gt.1943-5606.0001634

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] 熊本地震における微地形と液状化要因の関係性2019

    • Author(s)
      北澤聖司,原 忠,中島昇,柴原隆,林伸二郎
    • Organizer
      第39回地震工学研究発表会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 微地形の形成過程と地形・地質特性に着目した液状化要因の分析2019

    • Author(s)
      北澤聖司,原 忠,中島昇,中山優理香
    • Organizer
      第54回地盤工学研究発表会発表講演集
    • Related Report
      2019 Annual Research Report
  • [Presentation] 圧密時間を経た砂質土の液状化強度に与える細粒分の影響2018

    • Author(s)
      早川飛翼, 門脇悠太, 豊田浩史, 高田晋
    • Organizer
      第36回土木学会関東支部新潟会研究調査発表会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 長期圧密による砂の力学特性変化2017

    • Author(s)
      西村裕平, 豊田浩史, 高田晋
    • Organizer
      第52回地盤工学研究発表会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 過圧密履歴を受けた砂の応力履歴消失を伴った再液状化特性に関する研究2017

    • Author(s)
      高田晋, 豊田浩史
    • Organizer
      第52回地盤工学研究発表会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 細粒分を含む砂における長期圧密が液状化強度に与える影響2017

    • Author(s)
      門脇悠太, 西村裕平, 豊田浩史, 高田晋
    • Organizer
      第35回土木学会関東支部新潟会研究調査発表会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 丸太打設により改良された海岸埋立地の地震・間隙水圧計観測システムの概要2017

    • Author(s)
      原 忠,林聖淳,三村佳織,沼田淳紀
    • Organizer
      第52回地盤工学研究発表会
    • Related Report
      2017 Annual Research Report
  • [Presentation] 丸太打設により改良された埋立地盤の現地観測結果に関する考察2017

    • Author(s)
      原 忠,林聖淳,沼田淳紀,三村佳織
    • Organizer
      地盤工学会四国支部平成29年度技術研究発表会
    • Related Report
      2017 Annual Research Report
  • [Book] 地盤・土構造物のリスクマネジメント~地盤崩壊・液状化のメカニズムとその解析、監視、防災対策~2019

    • Author(s)
      原 忠,他
    • Total Pages
      338
    • Publisher
      株式会社エヌ・ティー・エス
    • ISBN
      9784860435820
    • Related Report
      2018 Annual Research Report

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Published: 2017-04-28   Modified: 2021-02-19  

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