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Study on improvement of log piling method for liquefaction mitigation by adding special functions

Research Project

Project/Area Number 26420489
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Geotechnical engineering
Research InstitutionFukui National College of Technology

Principal Investigator

Yoshida Masaho  福井工業高等専門学校, 環境都市工学科, 教授 (90210723)

Co-Investigator(Kenkyū-buntansha) 宮島 昌克  金沢大学, 環境デザイン学系, 教授 (70143881)
沼田 淳紀  飛島建設株式会社技術研究所, -, 主席研究員 (10443649)
Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords地震 / 液状化 / 木材 / 間隙水圧消散 / 丸太 / 振動台実験 / 透水試験 / 押し込み試験 / ねじり試験 / 炭素繊維
Outline of Final Research Achievements

Although a countermeasure against liquefaction using logs is aiming at increasing the density of loose sandy ground, it allows that some layers partially liquefy against Level 2 earthquake ground motions. The log with drainage function based on a water pressure dissipation method was proposed by opening holes in a core and on the surface of the log. The principle of the method is to dissipate water pressure when an excess pore water pressure increases by Level 2 earthquake ground motions. Permeability tests and small scale shaking table tests were conducted to evaluate the effectiveness of the piling log with drainage function. As a result, the log with drainage could reduce the rate of accumulation of excess pore water pressure and increase the velocity of its dissipation by its high permeability. Furthermore, the settlement of lightweight structure could be mitigated because the effect of log with drainage improved liquefaction resistance.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report
  • Research Products

    (9 results)

All 2017 2016 2015

All Presentation (9 results) (of which Int'l Joint Research: 2 results)

  • [Presentation] 排水機能付実丸太の液状化対策効果に関する基礎的実験2017

    • Author(s)
      吉田雅穂,松浦透,沼田淳紀
    • Organizer
      第52回地盤工学研究発表会
    • Place of Presentation
      名古屋国際会議場
    • Year and Date
      2017-07-08
    • Related Report
      2016 Annual Research Report
  • [Presentation] 軟弱粘性土中にある丸太の押込み試験の結果2017

    • Author(s)
      沼田淳紀,吉田雅穂,佐々木修平,村田拓海,川崎淳志,佐々木貴信
    • Organizer
      第52回地盤工学研究発表会
    • Place of Presentation
      名古屋国際会議場
    • Year and Date
      2017-07-08
    • Related Report
      2016 Annual Research Report
  • [Presentation] 排水機能を付けた丸太の粘性土地盤における鉛直支持力2017

    • Author(s)
      沼田淳紀,村田拓海,吉田雅穂,松下克也,佐々木修平,佐々木貴信
    • Organizer
      第67回日本木材学会大会
    • Place of Presentation
      九州大学箱崎キャンパス
    • Year and Date
      2017-03-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] Study on Liquefaction Countermeasure Technique by using Logs with Drainage Function for Residential Houses2017

    • Author(s)
      Yoshida, M., Miyajima M., Miwa, S. and Numata, A.
    • Organizer
      Proc. of the 16th World Conference on Earthquake Engineering
    • Place of Presentation
      CasaPiedra Convention Center
    • Year and Date
      2017-01-09
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] Study on countermeasure against liquefaction by piling logs with drainage function2016

    • Author(s)
      Yoshida, M., Isoshima, K., Kawabata, Y.
    • Organizer
      The 14th International Symposium on Geo-disaster Reduction
    • Place of Presentation
      Xinhua Hotel, Chengdu
    • Year and Date
      2016-10-17
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 2016年熊本地震による住宅の液状化被害に関する調査的研究2016

    • Author(s)
      芹川由布子,Hendra Seitawan,中村満,宮島昌克,吉田雅穂
    • Organizer
      土木学会第36回地震工学研究発表会
    • Place of Presentation
      金沢歌劇座
    • Year and Date
      2016-10-17
    • Related Report
      2016 Annual Research Report
  • [Presentation] 排水機能付き丸太を用いた液状化対策に関する模型振動実験2016

    • Author(s)
      吉田雅穂,五十島康平,川端祐輝
    • Organizer
      第51回地盤工学研究発表会平成28年度発表講演集
    • Place of Presentation
      岡山大学
    • Year and Date
      2016-09-13
    • Related Report
      2015 Research-status Report
  • [Presentation] 既設戸建住宅の基礎に丸太を連結する液状化対策に関する模型振動実験2015

    • Author(s)
      吉田雅穂,坂下和也,三輪滋
    • Organizer
      第50回地盤工学研究発表会
    • Place of Presentation
      北海道科学大学
    • Year and Date
      2015-09-01 – 2015-09-03
    • Related Report
      2014 Research-status Report
  • [Presentation] 排水機能付き丸太を用いた液状化対策に関する基礎的検討2015

    • Author(s)
      五十島康平,吉田雅穂
    • Organizer
      北海道科学大学
    • Place of Presentation
      北海道科学大学
    • Year and Date
      2015-09-01 – 2015-09-03
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2018-03-22  

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