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Reiknforcement effect arising from confining dilatancy and its evaluation

Research Project

Project/Area Number 12650494
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

IIZUKA Atsushi  Kobe University, Associate Professor, 工学部, 助教授 (40184361)

Co-Investigator(Kenkyū-buntansha) KAWAI Katsuyuki  Kobe University, Instructor, 工学部・建設学科, 助手 (30304132)
KARUBE Daizo  Kobe University, Professor, 大学院・自然科学研究科, 教授 (70031078)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2000: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordsshear deformation / dilatancy / unsaturated soils / pore water migration / reinforcement effect / strength / F.E. simulation / 土構造物の品質 / 補強財,補強効果 / 締固め土 / 不飽和 / せん断・強度特性 / ダイレタンシー特性 / 初期値・境界値問題 / 弾塑性構成モデル / 等価先行圧密圧力 / 下負荷面モデル
Research Abstract

This research aims at revealing the reinforcement mechanism by geosynthetics. The attention is paid to confining effect by the geosynthetics under shearing. The confining effect is interpreted as the mechanical interaction such that the reinforcement works so as to prevent dilative deformation of compacted soils. The investigators, first, try to explain the geosynthetic-reinforcement mechanism throughout a series of finite element simulations for geosynthetic-reinforced soil structures, in which the soils are modeled as elasto-plastic materials considering dilatancy characteristics of compacted soils. However, in order to heighten the usefulness of such a numerical simulation in the practical design work, the authors realized that the mechanical interaction between soils and reinforcement, that is, the reinforcement mechanism, should be more precisely understood from a viewpoint of mechanical characteristics of soils itself. Then, a series of laboratory tests for compacted (usually unsaturated) sandy soils is carried out. And some model tests in the laboratory are also performed. Compacted soil specimens (30 cm in diameter and 40 cm in height) are wrapped by geosynthetics. The specimens are laid on the uniaxial loading apparatus and are subjected to compressive shear. The extensive stresses working to the geosynthetics are measured during shear.

Report

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

    (28 results)

All Other

All Publications (28 results)

  • [Publications] 本田道識: "不飽和土の応力-ひずみ関係式"土木学会論文集. No659/III-52. 153-164 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 飯塚敦: "間隙水分布の違いを考慮した不飽和土/水連成解析"土木学会論文集. No659/III-52. 165-178 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 飯塚敦: "ジオシンセティックスによるダイレイタンシー拘束効果"土木学会論文集. No680/III-55. 15-28 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yoshida, T et al.: "Applicability of an elasto-plastic model for reinforced soil structures"Proc.of International Symposium on Earth Reinforcement (IS-Kyushu 2001). Vol.1. 507-510 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Pipatpongsa, T et al.: "Nonlinear analysis for stress-strain-strength of clays using return-mapping algorithms"JSCE, Journal of Applied Mechanics. Vol.4. 295-306 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 森川嘉之: "体積変化を考慮したせん断帯生成理論"土木学会,応用力学論文集. Vol.4. 367-374 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kojima, K., Ohta, H., Tateyama, M. and Iizuka, A.: "A simple method of back-fill settlement associated with excavation work"JSCE, Journal of Geotechnical Engineering. No.652/III-51(in Japanese). 217-228 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Honda, M., Iizuka, A., Kawai, K. and Karube, D.: "Stress-strain relationship for unsaturated soil"JSCE, Journal of Geotechnical Engineering. No.659/III-52(in Japanese). 153-164 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Iizuka, A., Honda, M., Nishida, H., Kawai, K. and Karube, D.: "Soil/water coupled analysis considering unsaturated pore water distribution"JSCE, Journal of Geotechnical Engineering. No.659/III-52(in Japanese). 165-178 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Iizuka, A., Hirata, M. and Ohta, H.: "Reinforcement effect arising from confining dilatancy by geosynthetics"JSCE, Journal of Geotechnical Engineering. No.680/III-55(in Japanese). 15-28 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Pipatpongsa, T., Iizuka, A.,m Kobayashi, I., Ohta, H. and Suzuki, Y.: "Nonlinear analysis for stress-strain-strength of clays using return-mapping algorithms"JSCE, Journal of Applied Mechanicals. Vol.4. 295-306 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Morikawa, Y., Iizuka, A and Ohta, H.: "Prediction of shear band formation with volume change"JSCE, Journal of Applied Mechanics. Vol.4(in Japanese). 367-374 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kobayashi, L., Soga, K., Iizuka, A., Ohta, H. and Dalton, C.: "Effect of pore water migration on self-boring pressuremeter strength"JSCE, Journal of Applied Mechanics. Vol.4. 285-294 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Saito, T., Kitamura, A., Iizuka, A. and Ohta, H.: "Geological approach to the void ratio distribution for aged clays based on Bjerrum s hypothesis"Southeast Asian Geotechnical Society (SAGS), Journal of Geotechnical Engineering. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kojima, K., Iizuka, A., Ohta, H. and Tateyama, M.: "An observational prediction method of back-fill settlement in excavation work"JSCE Journal of Geotechnical Engineering. No.694/III-57(in Japanese). 67-79 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Pipapongsa, T., Iizuka A., Kobayashi,m I. and Ohta, H.: "FEM formulation for analysis of soil constitutive model with a corner on the yield surface"JSCE, Journal of Structural Engineering. Vol.48A. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Pipatpongsa, T., Ohta, H., Iizuka, A. and Hashimoto, M.: "Effects of some parameters on braced-excavation of soft clay by numerical studies"Proc. of Coastal Geotechnical Engineering in Practice (IS-YOkoham). Vol.1. 351-356 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Kawaida, M., Morii, Y., Horikoshi, K., Iizuka, A., Kobayashi, I. and Ohta, H.: "A repair work of a bridge abutment suffering from excessive deformation of soft clay foundation"Proc. of 3^<rd> Regional Symposium on Infrastructure Development in Civil Engineering. 373-380 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Yoshida, T., Mori, K., Iizuka, A., Maegawa, F. and Amano, S.: "Applicability of an elasto-plastic model for reinforced soil structures"Proc. of the International Symposium on Earth Reinforcement (IS-Kyushu 2001). Vol.1. 507-510 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 本田道識: "不飽和土の応力-ひずみ関係式"土木学会論文集. No659/III-52. 153-164 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] 飯塚敦: "間隙水分布の違いを考慮した不飽和土/水連成解析"土木学会論文集. No659/III-52. 165-178 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] 飯塚敦: "ジオシンセティックスによるダイレイタンシー拘束効果"土木学会論文集. No680/III-55. 15-28 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Yoshida, T et al.: "Applicability of an elasto-plastic model for reinforced soil structures"Proc. of International Symposium on Earth Reinforcement (IS-Kyushu 2001). Vol.1. 507-510 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Pipatpongsa, T et al.: "Nonlinear analysis for stress-strain-strength of clays using return-mapping algorithms"JSCE, Journal of Applied Mechanics. Vol.4. 295-306 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 森川嘉之: "体積変化を考慮したせん断帯生成理論"土木学会,応用力学論文集. Vol.4. 367-374 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 飯塚敦: "間隙水分布の違いを考慮した不飽和土の土/水連成解析"土木学会論文集. No.659/III-52.. 165-178 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 河井克之: "間隙比を考慮した水分特性曲線モデル"土木学会論文集. No.666/III-53. 291-302 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Karube,D.(軽部大蔵): "A proposal for the method of formulation of water retention curve for unsaturated soils"建設工学研究所論文報告集. 第42-A. 1-12 (2000)

    • Related Report
      2000 Annual Research Report

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

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