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Reinforcement for Upgrading Earth Structures Using Geocomposites under Cyclic Loading

Research Project

Project/Area Number 12555140
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Geotechnical engineering
Research InstitutionIBARAKI UNVERSITY

Principal Investigator

YASUHARA Kazuya  lbaraki Univ., College of Eng., Professor, 工学部, 教授 (20069826)

Co-Investigator(Kenkyū-buntansha) MURAKAMI Satoshi  lbaraki Univ., College of Eng., Research Associate, 工学部, 助手 (10261744)
TANABASHI Yoshihiko  Nagasaki Univ., College of Eng., Professor, 工学部, 教授 (80039685)
KOMINE Hideo  Ibaraki Univ., College of Eng., Assoc. Professor, 工学部, 助教授 (90334010)
HIRAO Takao  Mitsui Chemical Products Co Ltd., Director, 土木資材部, 部長
MIYATA Yoshihisa  National Defense Academy Lecturer, 講師
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥12,100,000 (Direct Cost: ¥12,100,000)
Fiscal Year 2002: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2001: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2000: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsReinforcement / Geosynthetics / Upgrading / Sandwich earth structure / Cyclic loading / Embankment / 剛性 / 支持力 / 土構造物 / サンドイッチ工法 / 数値解析 / 模型実験 / 補強効果 / 排水効果 / 補強・排水機能 / 安定性 / 交通施設
Research Abstract

The present study aims at exploring a reinforcing method for upgrading earth structures under cyclic loading induced by traffic, ocean waves and earthquakes by using geocomposites which are manufactured by combining with two or three different kinds of geosynthetics. The keyword in this study is "Hybrid" and "Sandwich" which contains the following two aspects :
I) The material used in the study is a hybridized one in which the unwoven geosyntheitc is combined with the woven geosynthetic similar to the sandwich.
ii) Sand mat is placed at the both sides, above and beneath the geocomposite. This type can be called a hybrid-sandwich earth structure., In order to accomplish the advantageous aspects of the hybrid earth structure with the hybrid geosynthetic, model tests and numerical analysis were carried out. The following main findings were derived from the present study :
1) Sandwiched structures formed by sand mat placement in-between geosynthetics contribute to improvement of soft soils mo … More re markedly than in the case with sand mat only without geosynthetic reinforcement.
2) Sand mat placement combined with geosynthetics as a sandwich structure gives rise to improvement of permeability and transmssibity of geosynthetics. The geocomposite in which the woven geosynthetic is sandwiched by the woven geosynthetic in-getween is most suitable for accomplishing this purpose.
3) Advantages of sandwiched structures are recognized in the two aspects : the one is increase of stability of embankment and decrease in deformation and settlements of embankment.
4) The finite element computer code is formulated to consider the effect of confinement due to geosynthetics into deformation and stability of embankment with the sandwich structure.
5) Anew method combined by injecting cement mortar into send mat in the sandwich structure is suggested as a promising hybrid system for upgrading foundations and earth structures. In particular, this system is effective to increase stability and reduce settlements under cyclic loading induced by traffic ocean waves and earthquakes.
6) Either the use of geocomposite or the combination of non-woven geosynthetic with injection of cement mortar gives rise to stable reinforced revetments at the coastal area subjected to ocean wave actions. Less

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (36 results)

All Other

All Publications (36 results)

  • [Publications] Recio-Juan, 安原, 小峯, 村上: "Model tests on a geosynthetic reinforced sand revetment subjected to assailing waves"Journal of Geosynthetics. No.15. (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 永嶋, 棚橋, 蒋, 井, 川越, 田島: "補強材を併用したサンドイッチ盛土工法の模型実験"土木構造・材料論文集. No.17. 89-96 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 宮田, 重久, 木暮: "地震ハザード情報を活用するジオシンセティックス補強土壁の信頼性解析"ジオシンセティックス論文集. No.16. 31-36 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 棚橋, 永嶋, 陶山, 平井, 安原: "ジオコンポジット補強粘性土盛土の設計法試案"土木学会論文集. 722/III-58. 145-153 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 安原, Recio-Molina, 小峯, 村上: "波浪荷重を受けるジオシンセティックス補強土壁の設計法"ジオシンセティックス論文集. 17. 201-206 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuhara, K.: "Sandwich and hybrid reinforcement of earth structures and foundations using geosynthetics"International Symp. on Lowland Technology. 1. 27-39 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuhara, K. et al.: "A design procedure for geosynthetic-reinforced soil alls as revetments for protecting coastal area (in Japanese)"Geosynthetics Eng. Journal. 17. 201-206 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nagashima Y. et al.: "Judgment of drainage and reinforcing effects based on model tests of geocomposite-reinforced cohesive earth fill"J. JSCE. 722/lll-62. 25-36 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Ghosh, C., Yasuhara K., Murakami, S. and Komine, H.: "Shape and Deformation Patterns of Vertically Loaded Reinforced Sand"Geosynthetics Eng. Journal. 17. 228-233 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuhara, K.: "sandwich and hybrid reinforcement of earth structures and foundations using geosynthetics"Intn'l Symp. Lowland Technology. 1. 27-37 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuhara K., Tanabashi Y. and Hirao, K.: "Effects of sand mat on soft soil reinforcement using geosynthetics"Proc. International Symp. Lowland Technology. 1. 149-154 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuhara, K., Murakami, S. Ghosh, C. and Recio-Molina, J. A: "Advantageous aspects of the geo-composite learned from small-scaled model tests"Proc. 7^<th> Intn'l Conf. Geosyntheties. 1 (Paper No. 228). 435-440 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tanabashi, Y. et al.: "New design method of geocomposite-reinforced cohesive earth fills"J. JSCE. No. 70l/lll-58. 145-153 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuhara K. and Nakazoto, T.: "Settlement evaluation of geosynthetics-reinforced foundations(in Japanese)"Geosynthetics Eng. Journal. 16. 159-162 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Recio-Molina, J. A., Yasuhara, K.: "Model tests on a geosynthetic-reinforced sand revetment subjected to assailing waves"Geosynthetics Eng. Journal. 16. 239-245 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Miyata Y. et al.: "Reliability analysis for reinforced soil wall with seismic hazard information (in Japanese)"Geosynthetics Eng. Journal. 16. 31-36 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nagashima, H. et al.: "Model test of sandwich earth fill reinforced with geosynthetics (in Japanese)"Journal of Civil Structure & Material. 16. 89-96 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yasuhara, K., Murakami. S., Ghosh, C, and Recio-Molina, J. A.: "A diagrammatic evaluation of geocomposites for reinforcing cohesive soils"Proe. Intn'l Symp. Earth Reinforcement. 2. 299-304 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 棚橋, 永嶋, 陶山, 平井, 安原: "ジオコンポジット補強粘性土盛土の設計法試案"土木学会論文集. 701・III-58. 145-153 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 安原一哉: "地盤構造物の高規格化へ向けたジオシンセティックスの新しい展開"ジオシンセティックス技術情報(IGS日本支部会誌). 18・1. 1-5 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 安原, Recio-Molina, J., 小峯, 村上: "波浪荷重を受けるジオシンセティックス補強土護岸の設計法"ジオシンセティックス論文集. 17. 201-206 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yasuhara, K.: "Sandwich and hybrid reinforcement of earth structures and foundations using Geosynthetics"International Symp. Lowland Technology. 1. 27-39 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 永嶋, 棚橋, 平井, 西村, 安原: "ジオコンポジットを用いた補強粘性土盛土模型実験による排水・引張り補強効果の把握"土木学会論文集. 722/III-61. 25-36 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yasuhara, K., Murakami, S.: "Advantageous aspects of the geo-composite learned from small-scaled model tests"Proc. 7th Intn'l Conf. Geosynthetics. 1. 435-440 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Yasuhara, K., Murakami, S. 他: "A diagramatic evaluation of gee-cmposctes for reinforcing cohesive soils"Proc. IS-KYUSHU 2001. Vol.2. 299-304 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Recio-M.J., Yasuhara, K.他: "Model tests on a geosynthetic reinforced sana revetwent subjected to assailing waves"Joural of Geosynthetics. No.15. (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 永嶋, 棚橋, 蒋, 井, 川越, 田島: "補強材を併用したサンドイッチ盛土工法の模型実験"土木・構造・材料論文集. No.17. 89-96 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 棚橋, 永嶋, 陶山, 平井, 安原: "ジオコンポジット補強粘性土盛土の設計法試案"土木学会論文集. 683,III-58. (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 宮田, 重久, 木暮: "地震ハザード情報を活用するジオシンセティックス補強土壁の信頼性解析"ジオシンシティックス論文集. Vol.16. 31-36 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Miyata, Y., Shigehisa, Z., Kogure, K.: "Reliability analysis of geosyuthetics reinforced soil wall"Proc. 4th Int. Symp. Earth Reinforcemeut. Vol.1. 417-420 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 安原,鈴木,阿部: "室内模型実験からジオコンポジットによる粘性土の補強効果と排水効果を評価する方法"ジオシンセティック論文集. 第15巻. 138-145 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ghosh,Yasuhara and Murakami: "Confinement effect of geosynthetic reinforcement in granular fill underlain by soft soil"ジオシンセティックス論文集. 第15巻. 176-184 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 棚橋,蒋,高原,永嶋 他: "ジオコンポジット補強盛土の浸透・安定性評価と浸透力を考慮した盛土安定解析法の提案"長崎大学工学部研究報告. 第30巻155号. 215-220 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tanabashi,Y. et al.: "New design method for geocomposites-reinforced cohesine earth fills"Intril donf・Geotech & Geological Eng.(Geo Eng.2ooo). Vol.1. GIGS-1036 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 宮田,木暮,重久: "ジオテキスタイルによって圧密促進された粘性土盛土の安定性に関する解析的検討"土木学会論文集. 666/VI-53. 193-202 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 宮田,末次,木暮: "粘性土のダイレイタンシー特性がジオコンポジットの引抜き抵抗特性に及ぼす影響"ジオシンセティックス論文集. 第15巻. 128-137 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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