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2012 Fiscal Year Final Research Report

Investigation on subgrade reaction of pile with taking effects of cyclic shear strain of soil into account

Research Project

  • PDF
Project/Area Number 22760415
Research Category

Grant-in-Aid for Young Scientists (B)

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

Principal Investigator

SUZUKI Hiroko  東京工業大学, 大学院・理工学研究科, 助教 (60401527)

Project Period (FY) 2010 – 2012
Keywords基礎構造杭基礎 / 地盤剛性 / 繰返し履歴 / 液状化
Research Abstract

To propose guideline of scaling factors for subgrade reaction of pile in liquefied ground, effects of cyclic shear strain of soil on subgrade reaction of pile are investigated. The following conclusions may be made: 1) With increasing the relative displacement between piles and soil, the subgrade reaction increases due to recovery of effective stress. With cyclic shear strain of soil, the recovery of effective stress is insignificant and then the subgrade reaction decreases. The decrease in subgrade reaction due to cyclic shear strain is more significant in loose soil than in dense soil; 2) The scaling factor for subgrade reaction might be defined by cyclic number and amplitude of shear stress. The estimated subgrade reaction is in good agreement with the observed one both before and after liquefaction; 3) A decrease in subgrade reaction induces a decrease in shaft friction of piles. This suggests that it is important to consider the equilibrium of vertical load as well as that of horizontal load.

  • Research Products

    (6 results)

All 2013 2012 2011 2010

All Journal Article (1 results) Presentation (5 results)

  • [Journal Article] 正負交番鉛直荷重が直杭および羽根付杭の鉛直支持力・引抜き抵抗力に与える影響2012

    • Author(s)
      時松孝次,稲村渓,鈴木比呂子,和田昌敏,眞野英之
    • Journal Title

      日本建築学会構造系論文集

      Volume: Vol.77,No.681 Pages: 1683-1689

    • URL

      http://dx.doi.org/10.3130/aijs.77.1683

  • [Presentation] 群杭の水平および鉛直荷重の分担に影響を及ぼす要因の検討2013

    • Author(s)
      鈴木比呂子,時松孝次
    • Organizer
      2013年度日本建築学会大会
    • Place of Presentation
      北海道大学(北海道)
    • Year and Date
      2013-08-31
  • [Presentation] Estimation of Bearing Capacity and Pull- out Resistance of a Pile with or without a Wing Plate in Alternately Cyclic Loading based on Centrifugal Model Tests2013

    • Author(s)
      Hiroko Suzuki, Kei Inamura, Kohji Tokimatsu, Masatoshi Wada and Hideyuki Mano
    • Organizer
      Proc. of 10th International Conference on Urban Earthquake Engineering
    • Place of Presentation
      Tokyo Institute of Technology (Tokyo).
    • Year and Date
      2013-03-02
  • [Presentation] 繰り返しせん断による飽和地盤の剛性低下を評価し た地盤反力の推定2011

    • Author(s)
      稲村渓,鈴木比呂子,時松孝次
    • Organizer
      2011年度日本建築学会大会
    • Place of Presentation
      早稲田大学(東京都)
    • Year and Date
      2011-08-25
  • [Presentation] 液状化地 盤の剛性低下が杭の応力に与える影響2010

    • Author(s)
      稲村渓,鈴木比呂子,時松孝次
    • Organizer
      第45回地盤工学研究発表会
    • Place of Presentation
      愛媛大学(愛媛県)
    • Year and Date
      2010-08-18
  • [Presentation] 2007年新潟県中越沖地震における杭基礎構造物の被害2010

    • Author(s)
      渡辺幸大,鈴木比呂子,時松孝次
    • Organizer
      第45回地盤工学研究発表会
    • Place of Presentation
      愛媛大学(愛媛県)
    • Year and Date
      2010-08-18

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Published: 2014-08-29  

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