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A newly developed 'Compacted Bulb Foundation Method' and its application

Research Project

Project/Area Number 07455193
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

TAKADA Naotoshi  Faculty of Engineering Osaka University Professor, 工学部, 教授 (50047239)

Co-Investigator(Kenkyū-buntansha) OSHIMA Akihiko  Faculty of Engineering Osaka City University Research Associate, 工学部, 助手 (10203762)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1996: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1995: ¥2,900,000 (Direct Cost: ¥2,900,000)
KeywordsBearing capacity / Spread foundation / Coefficient of subgrade reaction / Centrifuge model test / Impact load / Compaction / Ground deformation / Sandy soil / 新工法
Research Abstract

Heavy tamping is one of ground improvement technique for loose sandy ground and gravelly and rock waste fill. This method generally aims at uniformly compacting the whole ground, however, we found that a high density compacted area bulbously grew up beneath the tamping point by ram blow. The purpose of this study is to investigate the development and application of 'Compacted Bulb Foundation Method', which applies heavy tamping to the spread foundation. A series of centrifuge model tests was carried out to investigate effects of ram mass, ram base area, number of blows, number of passes and foundation base area on characteristic of bearing capacity of compacted dulb foundation.
Main conclusions are : 1)ultimate bearing capacity of compaction bulb foundation increases more than 200 times and coefficient of subgrade reaction increases the number by 10 times in comparison with initial ground, 2)under ram mass less than 20t, the ground tamped by ram having large base area than that of foundation denotes large bearing capaci, 3)inversely, under ram mass more than 40t, ground tamped by ram having large base area than that of foundation denotesless bearing capacity, but this tendency can guess that degree of compaction of backfilling is small, 4)larger base area of ram can have high bearing capacity under the same ram mass. From these results, a design procedure of this method using the coefficient of subgrade reaction and the allowable settlement was proposed.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] 大島昭彦: "重錘落下による締固め範囲と運動量の関係-単点打撃における密度と強度の増加域-" 土木学会論文集. No.554 III-37. 185-196 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大島昭彦: "締固め球根基礎工法の開発と適用性(第1報)" 第32回地盤工学研究発表会講演集. (発表予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大島昭彦: "締固め球根基礎工法の開発と適用性(第2報)" 第32回地盤工学研究発表会講演集. (発表予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大島昭彦: "締固め球根基礎工法の開発と適用性(第3報)" 土木学会第52回年次学術講演会概要集. III(発表予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大島昭彦: "重錘落下締固めにおける重錘挙動と地盤応力" 土木学会論文集. No.561 III-38(印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大島昭彦: "重錘による砂地盤打撃時の重錘加速度と貫入量-重錘の質量と底面積の影響-" 土木学会論文集. No.561 III-38(印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akihiko Oshima: "Relation between compacted area and ram momentum by heavy tamping -density and strength increases due to single point tamping-" Journal of JSCE. No.554, III-37. 185-196 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akihiko Oshima: "A newly developed 'Compacted Bulb Foundation Method'and its application (1st report)" Proc.of 31th JGS Annual meeting20GD02 : (intended publication). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akihiko Oshima: "A newly developed 'Compacted Bulb Foundation Method'and its application (2nd report)" Proc.of 31th JGS Annual meeting. (intended publication). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akihiko Oshima: "A newly developed 'Compacted Bulb Foundation Method'and its application (3nd report)" Proc.of 51th JSCE Annual meeting. (intended publication). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akihiko Oshima: "Ram penetration behavior and ensuing earth pressure during ram blow on sandy soil" Jounal of JSCE. No.561, III-38 (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Akihiko Oshima: "Effect of ram mass and base area on ram inpact acceleration and penetration of sandy ground" Journal of JSCE. No.561, III-38 (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 大島昭彦: "重錘落下による締固め範囲と運動量の関係-単点打撃における密度と強度の増加域-" 土木学会論文集. No.554 III-37. 185-196 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大島昭彦: "締固め球根基礎工法の開発と適用性(第1報)(発表予定)" 第32回地盤工学研究発表会講演集. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大島昭彦: "締固め球根基礎工法の開発と適用性(第2報)(発表予定)" 第32回地盤工学研究発表会講演集. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大島昭彦: "締固め球根基礎工法の開発と適用性(第3報)(発表予定)" 土木学会第52回年次学術講演会概要. III. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 大島昭彦: "重錘落下による締固め範囲に与える土の粒径と地盤密度の影響(発表予定)" 第31回土質工学研究発表会講演会. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大島昭彦: "重錘落下締固め工法の改良深度に与えるシリーズ施工数の影響" 第31回土質工学研究発表会講演集. (発表予定). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大島昭彦: "重錘落下による締固め範囲に与える地下水位の影響工法の改良深度に与えるシリーズ施工数の影響" 第51回土質工学研究発表会講演集. III(発表予定). (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 大島昭彦: "重錘落下による締固め球根基礎工法の遠心模型実験" 第51年次学術講演会概要集. III(発表予定). (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2016-04-21  

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