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A study on the accelerated consolidation method combing vertical drain and dewatering for dredged clay

Research Project

Project/Area Number 14550497
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

OSHIMA Akihiko  Osaka City University, Faculty of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (10203762)

Co-Investigator(Kenkyū-buntansha) TAKADA Naotoshi  Osaka City University, Faculty of Engineering, Professor, 大学院・工学研究科, 教授 (50047239)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2002: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsConsolidation / Ground improvement / Vertical drain / Plastic board drain / Centrifuge model test / Dredged clay / Consolidation theory / Dewatering / 埋立地盤 / 軟弱地盤 / バーチカルドレーン / プラスティクボードドレーン
Research Abstract

Reclamation projects in the form of man-made islands in the bay area have been used for the disposal of the dredged clay generated from the creation and maintenance of navigable waterways and shipping berths, and the dredging river beds. Plastic board drain (PBD) is generally used for the accelerating consolidation of the dredged clay layer Dredged clay shows high water content and low strength, and is consolidated by only its self-weight in the natural condition. However, the efficiency of PBD on the self-weight consolidation process is unknown, and the applicability of Barron's solution, which used generally in order to analyze the consolidation process for the improved ground, is also unknown. In this paper, a series of centrifuge model tests of cylindrical drain and banded drain, simulating sand drain and plastic board drain, respectively, was conducted to investigate the converted drain diameter of the banded drain, the effect of diameter (width) and pitch of the drain, and the in … More fluence of clay thickness on the self-weight consolidation process. These results were interpreted by the existing consolidation theory's solution. Furthermore, the efficiency and mechanism of the method combining vertical drain and dewatering was investigated.
Main conclusions are as follows: 1)effect of the drain is small in case a water content of dredged clay is higher, 2)the method of converting the drain circumference into the diameter can be applied to the converted drain diameter, 3)the consolidation of the deforming type in which the drain deforms by following the settlement of the clay, proceeds slightly faster than that of the fixed type in which the drain doesn't deform, 4)Barron's solution does not explain the experimental values, and 5)the compound solution by Barron's solution and Mikasa's one-dimensional self-weight consolidation solution is sufficient to explain them, therefore the compound solution is considered a practical calculation method.
In the meantime, more large effect of accelerating consolidation was obtained in the method combining vertical drain and dewatering. However, peeling of the side and central collapse phenomenon occurred on the tests as the pore water pressure in the drain decreased, and they did not become one-dimensional consolidated deformation. In present tests, the increase of the effective stress corresponding to the reduction of water level could not be confirmed. Less

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (34 results)

All Other

All Publications (34 results)

  • [Publications] 木山正明: "処分場におけるバーチカルドレーンによる浚渫粘土の減容化技術"地盤工学会,粘土地盤における最新の研究と実際に関するシンポジウム論文集. 275-282 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "PBDによる浚渫粘土の圧密促進効果に関する遠心模型実験"第37回地盤工学研究発表会論文集. No.496. 985-986 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "PBDによる浚渫粘土の自重圧密促進効果に関する遠心模型実験"日本材料学会第5回地盤改良シンポジウム論文集. 217-222 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 木山正明: "真空圧密工法とPDF工法を併用した新しい圧密促進工法"日本材料学会第5回地盤改良シンポジウム論文集. 227-232 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "円筒状ドレーンによる浚渫粘土の自重圧密促進効果"第38回地盤工学研究発表会論文集. No.483. 965-966 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "浚渫粘土の円筒,滞状ドレーンによる自重圧密促進効果の比較"土木学会第58回年次学術講演会講演概要集. III-496. 991-992 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "帯状ドレーンによる浚渫粘土の自重圧密促進効果"土木学会第58回年次学術講演会講演概要集. III-497. 993-994 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "バーチカルドレーンによる浚渫粘土の自重圧密促進効果"地盤工学会第48回地盤工学シンポジウム論文集. 441-448 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 木山正明: "真空圧密とPDFシステムを併用した新しい圧密促進工法"材料. 37-40 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "PBDによる浚渫粘土の圧密促進効果 -換算ドレーン直径とドレーン変形の影響-"第39回地盤工学研究発表会. (印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "浚渫粘土の自重圧密過程におけるPBDによる圧密促進効果"土木学会第59回年次学術講演会. (印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Masaaki Kiyama: "Volume reducing technology of dredged clay by vertical drains at disposal site"Proc.of Symposium of the latest study and practice on clay ground, JGS. 275-282 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiko Oshima: "Centrifuge model tests on consolidation of dredged clay improved by plastic-board-drain"Proc.of 37th JGS Annual meeting. 985-986 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiko Ohima: "Centrifuge model tests on self-weight consolidation of dredged clay improved by plastic-board-drain"Proc.of 5th Symposium on Ground Improvement, SMSJ. 217-222 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Masaaki Kiyama: "The new accelerated consolidation method combing vacuum consolidation and plastic-board-drain by floating system (PDF) of dredged clay"Proc.of 5th Symposium on Ground Improvement, SMSJ. 227-232 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiko Oshima: "Efficiency of cylindrical vertical drain on self-weight consolidation of dredged clay"Proc.of 38th JGS Annual meeting. 965-966 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiko Oshima: "Comparison between cylindrical and banded vertical drain on self-weight consolidation of dredged clay"Proc.of 58th JSCE Annual meeting. III-496. 991-992 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiko Oshima: "Efficiency of banded vertical drain on self-weight consolidation of dredged clay"Proc.of 58th JSCE Annual meeting. III-497. 993-994 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiko Oshima: "Efficiency of Plastic board drain on self-weight consolidation of dredged clay"Proc.of 48th Symposium on Geotechnical Engineering, JGS. 441-448 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Masaaki Kiyama: "The new accelerated consolidation method combing vacuum consolidation and plastic-board-drain by floating system (PDF) methods"Journal of SMSJ. Vol.53,No.1. 37-40 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akhiko Oshima: "Efficiency of Plastic Board Drain on Self-weight Consolidation of Dredged Clay"Proc.of 39th JGS Annual meeting. (on press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Akihiko Ohsima: "Efficiency of Plastic Board Drain on Self-weight Consolidation of Dredged Clay"Proc.of 59th JSCE Annual meeting. (on press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 大島昭彦: "PBDによる浚渫粘土の圧密促進効果に関する遠心模型実験"第37回地盤工学研究発表会論文集. No.496. 985-986 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] 大島昭彦: "PBDによる浚渫粘土の自重圧密促進効果に関する遠心模型実験"日本材料学会第5回地盤改良シンポジウム論文集. 217-222 (2002)

    • Related Report
      2003 Annual Research Report
  • [Publications] 大島昭彦: "円筒状ドレーンによる浚渫粘土の自重圧密促進効果"第38回地盤工学研究発表会論文集. No.483. 965-966 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 大島昭彦: "浚渫粘土の円筒,帯状ドレーンによる自重圧密促進効果の比較"土木学会第58回年次学術講演会講演概要集. III-496. 991-992 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 大島昭彦: "帯状ドレーンによる浚渫粘土の自重圧密促進効果"土木学会第58回年次学術講演会講演概要集. III-497. 993-994 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 大島昭彦: "バーチカルドレーンによる浚渫粘土の自重圧密促進効果"地盤工学会第48回地盤工学シンポジウム論文集. 441-448 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 大島昭彦: "PBDによる浚渫粘土の圧密促進効果に関する遠心模型実験"第37回地盤工学研究発表会講演集. 985-986 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 大島昭彦: "PBDによる浚渫粘土の自重圧密促進効果に関する遠心模型実験"日本材料学会第5回地盤改良シンポジウム. 217-222 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 大島昭彦: "真空圧密工法とPDF工法を併用した新しい圧密促進工法"日本材料学会第5回地盤改良シンポジウム. 227-232 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 大島昭彦: "鉛直排水工による浚渫粘土の自重圧密促進効果"第38回地盤工学研究発表会講演集. (発表予定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 大島昭彦: "PBD打設ピッチによる浚渫粘土の自重圧密促進効果"土木学会第58回年次学術講演会概要集. (発表予定). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 大島昭彦: "円筒,帯状ドレーンによる浚渫粘土の自重圧密促進効果の比較"土木学会第58回年次学術講演会概要集. (発表予定). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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