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Evaluation of three dimensional vertical and lateral bearing capacities of pile foundations using X-ray CT

Research Project

Project/Area Number 15360256
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionKumamoto University

Principal Investigator

OTANI Jun  Kumamoto University, Faculty of Engineering, Professor, 工学部, 教授 (30203821)

Co-Investigator(Kenkyū-buntansha) OBARA Yuzo  Kumamoto University, Faculty of Engineering, Professor, 工学部, 教授 (50135315)
EIKUCHI Yoshiaki  Port and Airport Research Institute, Head, 地盤構造部, 室長
Project Period (FY) 2003 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥13,000,000 (Direct Cost: ¥13,000,000)
Fiscal Year 2004: ¥5,400,000 (Direct Cost: ¥5,400,000)
Fiscal Year 2003: ¥7,600,000 (Direct Cost: ¥7,600,000)
KeywordsPile Foundation / Vertical bearing capacity / Lateral bearing capacity / X-ray CT scanner / Model test / Three dimensions / Visualization / Image processing analysis
Research Abstract

The objective of this research is to evaluate both vertical and lateral bearing capacities of pile foundations using X-ray CT scanner. The contents of these two topics are summarized separately as follows :
(1)Vertical bearing capacity
There are several types of failure patterns such as those proposed by Terzaghi, Meyerhof and Vesic. But those have been proposed for the purpose of design calculation and are not based on close observation of real behavior. The objective of this research is to visualize and to characterize the failure patterns of the ground under vertically loaded pile foundation using X-ray CT scanner. Here, a series of model loading tests with different conditions such as shape of pile tip, effect of loading process, soil density and loading speed were conducted and the model ground was scanned in each case. Finally, the bearing capacity mechanism due to vertically loaded pile was visualized and evaluated in three dimensions without any destruction for the first time and … More it is convinced that X-ray CT is one of powerful tool in geotechnical engineering.
(2)Lateral bearing capacity
The objective of this research is to investigate three dimensional(3-D) failure patterns in sand due to laterally loaded pile using X-ray CT. Here, a new apparatus of model loading test especially for X-ray CT was developed and a series of model loading tests were conducted using this apparatus. Then, CT scanning was done for the model ground at several levels of loadings which were applied at the pile head. Not only cross sectional images for the ground but also those in 3-D were reconstructed. Here, a proper image processing analysis was conducted in order to obtain effective CT images. And, the failure patterns of the ground under laterally loaded pile were visualized without any destruction in three dimensions. Quantitative discussion was also examined. Finally, it is convinced that three dimensional failure patterns of the ground due to laterally loaded pile were visualized for the first time using X-ray CT. Less

Report

(3 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • Research Products

    (24 results)

All 2005 2004 2003 Other

All Journal Article (15 results) Book (2 results) Publications (7 results)

  • [Journal Article] 杭基礎断面形状が水平抵抗メカニズムの及ぼす影響2005

    • Author(s)
      佐野潤, Pham Dang Khoa, 大谷順, 松本英敏
    • Journal Title

      平成16年度土木学会西部支部研究発表会講演概要集

      Pages: 437-438

    • Related Report
      2004 Annual Research Report
  • [Journal Article] 杭基礎断面形状が水平支持力メカニズムの及ぼす影響2005

    • Author(s)
      佐野潤, Pham Dang Kooa, 大谷順, 松本英敏
    • Journal Title

      地盤工学会第40回地盤工学研究発表会発表講演集 (CD-ROM版)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Development of new test apparatus for lateral pile loading using X-ray CT scanner2004

    • Author(s)
      K.D.Pham
    • Journal Title

      Proc.of Vietnam-Japan Joint Seminar on Geotechnics and Geo-environment Engineering

      Pages: 86-93

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Development of new test apparatus for lateral pile loading using X-ray CT scanner2004

    • Author(s)
      K.D.Pham
    • Journal Title

      Proc.of Vietnam-Japan Joint Seminar on Geotechnics and Geo-environmental Engineering

      Pages: 86-93

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Evaluation of hydraulic property of mixed soil with air foam using X-ray CT method2003

    • Author(s)
      J.Otani
    • Journal Title

      Proc.of the 2^<nd> Asian Conference on Unsaturated Soils

      Pages: 71-74

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Characterization of permeability on light weight soil with air foam using X-ray CT scanner2003

    • Author(s)
      Y.Kikuchi
    • Journal Title

      Proc.International Workshop on X-ray CT for Geomaterials

      Pages: 133-138

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 杭の3次元水平抵抗メカニズムの可視化2003

    • Author(s)
      江副 哲
    • Journal Title

      応用力学論文集 Vol.6

      Pages: 476-474

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] State of the Art Report on Geotechnical X-ray CT research at Kumamoto University2003

    • Author(s)
      J.Otani
    • Journal Title

      Proc.of the International Workshop on X-ray CT for Geomaterials

      Pages: 43-77

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Visualization of the mechanism of tunnel face failure2003

    • Author(s)
      H.Nagatani
    • Journal Title

      Proc.of the International Workshop on X-ray CT for Geomaterials

      Pages: 185-190

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Visualization of 3-D failure patterns of ground due to lateral pile loadings2003

    • Author(s)
      K.D.Pham
    • Journal Title

      Proc.of the International Workshop on X-ray CT for Geomaterials

      Pages: 179-184

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Visualization of 3-D lateral bearing capacity mechanism of piles2003

    • Author(s)
      A.Ezoe
    • Journal Title

      Journal of Applied Mechanics, ASCE Vol.6

      Pages: 476-474

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Investigation of failure patterns in sand due to laterally loaded pile using X-ray CT scanner

    • Author(s)
      J.Otani
    • Journal Title

      Soils and Foundations (投稿中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] X線CTスキャナによる単杭の鉛直支持力特性の解明

    • Author(s)
      大谷 順
    • Journal Title

      土木学会論文集 (投稿中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Investigation of failure patterns in sand due to laterally loaded pile using X-ray CT scanner

    • Author(s)
      J.Otani
    • Journal Title

      Soils and Foundations (Submitted)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Characterization of bearing capacity under vertical loaded single pile using X-ray CT

    • Author(s)
      J.Otani
    • Journal Title

      Journal of Civil Engineering, JSCE (Submitted)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Book] 杭基礎の三次元水平抵抗メカニズムの解明に関する研究2005

    • Author(s)
      佐野 潤
    • Total Pages
      19
    • Related Report
      2004 Annual Research Report
  • [Book] X-RAY CT FOR GEOMATERIALS2003

    • Author(s)
      J.Otani
    • Total Pages
      379
    • Publisher
      BALKEMA, Netherlands
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Publications] J.Otani, Y.Kikuchi: "Evaluation of hydraulic property of mixed soil with air foam using X-ray CT method"Proc.of the 2^<nd> Asian Conference on Unsaturated Soils. 71-74 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Otani, J.Hironaka, T.Mukunoki: "Visualization of Failure Patterns under Vertically Loaded Pile Foundation Using X-ray CT Method"Prof.12^<th> Asian Regional Conf.on Soil Mechanics and Geotechnical Engineering. Vol.1. 973-976 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 江副 哲, 大谷 順, ファン・ダン・ホア: "杭の3次元水平抵抗メカニズムの可視化"応用力学論文集. Vol.6. 467-474 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Otani: "State of the Art Report on Geotechnical X-ray CT research at Kumamoto University"Prof.the International Workshop on X-ray CT for Geomaterials. 43-77 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Nagatani, J.Otani: "Visualization of the mechanism of tunnel face failure"Prof.the International Workshop on X-ray CT for Geomaterials. 185-190 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.D.Pham, J.Sano, J.Otani, A.Ezoe: "Visualization of 3-D failure patterns of ground due to lateral pile loadings"Prof.the International Workshop on X-ray CT for Ceomaterials. 179-184 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] J.Otani, Y.Obara: "X-RAT CT FOR GEOMATERIALS"BALKEMA. 379 (2003)

    • Related Report
      2003 Annual Research Report

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Published: 2003-04-01   Modified: 2016-04-21  

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