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Effect of Mechanical Behavior of Joints in Steel Pipe Sheet Pile Foundations on Horizontal Resistance of the Entire Foundation

Research Project

Project/Area Number 19K15087
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22030:Geotechnical engineering-related
Research InstitutionKyoto University

Principal Investigator

Sawamura Yasuo  京都大学, 工学研究科, 准教授 (20738223)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords鋼管矢板基礎 / 水平抵抗 / 継手 / 遠心模型実験 / 骨組み解析
Outline of Research at the Start

鋼管矢板基礎は,継手を有する鋼管矢板を閉鎖形状に打設し,継手管内にモルタルを充填することで基礎全体を結合する基礎形式である.本基礎形式の最大の特徴は,基礎内部における継手の変形を考慮している点にある.現在は継手単独の要素試験により鉛直方向のせん断特性を求め,それを骨組み解析に用いることで設計が行われている.しかし継手の評価が基礎全体の性能に大きな影響を及ぼすにも関わらず,継手の照査項目が不十分であり,さらに設計法の適用性を評価しうるベンチマークとなる実験が存在しない.本研究では鋼管矢板基礎の水平抵抗に及ぼす継手の影響を遠心模型実験により把握し,それを適切に表現可能なシミュレーターを開発する.

Outline of Final Research Achievements

Steel pipe sheet pile foundations are a unique foundation type in Japan in which steel pipe sheet piles with joints are cast in a closed geometry and the joint tubes are filled with mortar to connect the entire foundation. In this type of foundation, the evaluation of the joints between steel pipes is considered to have a great influence on the horizontal resistance of the entire foundation. In this study, three-dimensional characteristics of the joints were clarified by model tests, and horizontal loading tests were conducted on the entire foundation to investigate the horizontal resistance. Furthermore, it is shown that the numerical analysis can reproduce the experimental results with sufficient accuracy by appropriately taking into account the characteristics of the joints.

Academic Significance and Societal Importance of the Research Achievements

現状における鋼管矢板基礎の設計は,簡易な2次元解析を用いて行われる場合がほとんどであり,継手部の挙動が基礎全体の水平抵抗に与える影響を適切に表現しているとは言い難い.一方,工費削減を目的として,従来の継手に比べ高剛性・高耐力を有する継手や,深部の継手を省略した構造などが提案されており,これらを評価しうる設計手法が求められる.本研究で実施した模型実験とその再現解析により,実務で使用する3次元解析手法の精度検証が可能となり,鋼管矢板基礎の設計・施工の合理化に大きく資する結果が得られた.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (9 results)

All 2022 2021 2020

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (8 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Numerical Analysis of Mechanical Characteristics of Joint Structure of Steel Pipe Sheet Pile Foundation2021

    • Author(s)
      Miyazaki Yusuke、Sawamura Yasuo、Kusaba Shoma、Kimura Makoto、Nishihara Tomohiko、Kosaka Takashi、Hattori Masahiro、Maekawa Kazuhiko
    • Journal Title

      Challenges and Innovations in Geomechanics. IACMAG 2021. Lecture Notes in Civil Engineering

      Volume: 126 Pages: 59-67

    • DOI

      10.1007/978-3-030-64518-2_8

    • ISBN
      9783030645175, 9783030645182
    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 1G lateral loading test on steel pipe sheet pile model with quasi-brittle joint structure2022

    • Author(s)
      Peng, J., Miyazaki, Y., Sawamura, Y., Kosaka, T., Nishihara, T., Shinohara, M. and Hattori, M.
    • Organizer
      第57回地盤工学研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 構造物の表面粗さが地盤材料との接触面における摩擦特性に与える影響2022

    • Author(s)
      廣瀬 駿,澤村康生,木村 亮
    • Organizer
      第57回地盤工学研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 面圧センサーと小型圧力計を併用した土圧計測システムに関する検討2022

    • Author(s)
      宮﨑紀光,澤村康生
    • Organizer
      第57回地盤工学研究発表会
    • Related Report
      2021 Annual Research Report
  • [Presentation] JOINT VERTICAL SHEAR RESISTANCE OF STEEL PIPE SHEET PILE CONSIDERING CONFINING PRESSURE2022

    • Author(s)
      Peng, J., Miyazaki, Y., Sawamura, Y., Kosaka, T., Nishihara, T., Shinohara, M. and Hattori, M.
    • Organizer
      令和4年度土木学会全国大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 構造物の表面粗さが密詰め乾燥砂との繰返し載荷時の摩擦特性に与える影響2022

    • Author(s)
      廣瀬 駿,澤村康生,木村 亮
    • Organizer
      令和4年度土木学会全国大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Mechanical tests on joint part using plaster as filling material for steel pipe sheet pile model2021

    • Author(s)
      Peng, J., Miyazaki, Y., Sawamura, Y., Kimura, M., Kosaka, T., Nishihara, T. and Hattori, M.
    • Organizer
      第56回地盤工学研究発表会
    • Related Report
      2020 Research-status Report
  • [Presentation] Numerical analysis of mechanical characteristics of joint structure of steel pipe sheet pile foundation2020

    • Author(s)
      Miyazaki, Y., Sawamura, Y., Kusaba, S., Kimura, M., Nishihara, T., Kosaka, T., Hattori, M. and Maekawa, K.
    • Organizer
      Proc. of the 16th International Conference of the International Association for Computer Methods and Recent Advances in Geomechanics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 有限要素法を用いた鋼管矢板基礎の水平挙動に関する数値解析手法の提案2020

    • Author(s)
      宮﨑祐輔,澤村康生,草場翔馬,西原知彦,小坂 崇,服部匡洋,前川和彦,木村 亮
    • Organizer
      第55回地盤工学研究発表会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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