한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제20권2호
  • /
  • Pages.37-46
  • /
  • 2004
  • /
  • 1229-2427(pISSN)
  • /
  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
권호 표지

토목섬유로 보강된 다짐토 공시체의 구속효과에 관한 수치계산

Numerical Analysis of Confining Effect Due to Geosynthetics Wrapping Compacted Soil Specimen

  • Kim, Eun-Ra (Dept., of Civil Eng., Chonbuk National Univ.) ;
  • Kang, Ho-Keun (School of Mechanical and Aerospace, Gyeongsang National Univ.)
  • 발행 : 2004.03.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

본 연구에서는 토목섬유로 보강된 다짐토의 메카니즘이 제시되며, 이러한 메카니즘은 다짐토의 체적팽창(다일러턴시)을 토목섬유에 의해 구속 억제하는 과정에서 생성되는 효과로 간주된다. 먼저, 실내실험을 위한 구체적인 방법으로서, 토목섬유의 보강효과를 정량적으로 파악하기 위하여 사질토를 다짐하여 공시체를 만들어 그 주위에 토목섬유를 설치한 후 전체적으로 압축전단시험을 실시하였다. 실험에서 초기 다짐도는 각각의 종류에 대하여 다일러턴시의 특성이 다르기 때문에 각각의 공시체에 대하여 변화시켰다. 여기서 전단시험 도중에 다짐토의 다일러턴시 변형을 방지하기 위한 토목섬유에 작용하는 축방향 힘들(axial farces)이 조사되었다. 또한 다짐토의 탄소성 모델과 이러한 모델에 필요한 초기 입력치 값의 결정 방법들이 제시된다. 마지막으로, 탄소성 구성 모델에서 항복 이전의 탄성영역의 거동을 모사하기 위하여 Hashiguch(1989)가 제안한 subloading surface의 개념을 도입하여, 유한요소(FEM)해석을 통해 얻어진 결과들을 실내시험의 결과와 비교 분석하였다.

This paper presents the modeling of geosynthetic-reinforced soils and discusses the reinforcement effect arising from confining the dilatancy deformation of the soil by geosynthetics. A series of compressive shear tests for compacted sandy soil specimens wrapped by geosynthetics are carried out by quantitatively examining the geosynthetic-reinforcement effect, and it occurred from the confinement of the dilative deformation of compacted soils during shearing. In the test, the initial degree of compaction is changed for each series of sandy soil specimens so that each series has different degree of dilatancy characteristics. Herein, the axial forces working to the geosynthetics so as to prevent dilative deformation of compacted soils during shearing are measured. Furthermore, the elasto-plastic modeling of compacted soils and a rational determination procedure of input parameters needed in the elasto-plastic modeling are presented. In this paper, the subloading yielding surface(Hashiguchi(1989)) is introduced to the elasto-plastic modeling which could describe the irreversible deformation characteristics of compacted soils during shearing. Finally, the elasto-plastic finite element simulation is carried out and the geosynthetic-reinforcement effect is discussed.

키워드

참고문헌

  1. Int. J. of Solids and Structures v.25 Subloading Surface Model in Unconventional Plasticity Hashiguchi,K. https://doi.org/10.1016/0020-7683(89)90038-3
  2. Solis and Foundations v.27 no.3 A Deformation Procedure of Input Parameters in Elasto-Viscoplastic Finite element analysis Iizuka,A.;Ohta,H. https://doi.org/10.3208/sandf1972.27.3_71
  3. Proc. of 7th International Conference on Geosynthetics v.3 Compressive Shear Tests of Compacted Soils Wrapped by Geosynthetics Iizuka,A.;Hirata,M.;Yokota,Y.;Ohta,H.;Kim,E.R.;Kuto,T.
  4. Journal of Hungarian Architecture and Engineering Tarajmechanika Jaky,J.
  5. Proc. of 20th Symposium on Geotechnical Engineering Unstandardized Triaxial Testing Procedures and Related Subjects for Inquiry Karube,D.
  6. Proc. of 9th International Conference on Soil Mechanics and Foundation Engineering v.2 Stress-Deformation and Strength Characteristics Ladd,C.C.;Foott,R.;Ishihara,K.;Schlosser,F.;Poulos,H.G.
  7. Bulletin des Laboratories des Ponts et Chaussees v.232 no.Ref 4376 MOMIS: A Database for the Numerical Modelling of Embankment on Soft Soils and the Comparison between Computational Results and In-situ Measurements Mestat,P.
  8. Soils and Foundations v.16 no.1 Change in Undrained Shear Strength Characteristics of Saturated Remolded Clay due to Swelling Mitachi,T.;Kitago,S. https://doi.org/10.3208/sandf1972.16.45
  9. Journal of Geotechnical Engineering no.582/Ⅲ-41 Constant Volume Shear Strength of Clayey Soils Morikawa,Y.;Furuta,Y.;Iizuka,A.;Ohta,H.
  10. Thesis of Doctor of Engineering, Kyoto University Analysis of Deformation of Soils Based on the Theory of Plasticity and Its Applications to Settlement of Embankments Ohta,H.
  11. Proc. of 9th International Conference on Soil Mechanics and Foundation Engineering v.1 Strength of Dynamically Compacted Soils Ohta,H.;Hata,S.
  12. Journal of Geotechnical Engineering no.481/Ⅲ-25 Vane Strength in Anisotropically Consolidated Clay Deposits Ohta,H.;Nishihara,A.;Iizuka,A.;Sugie,S.
  13. Proc. of Int. Symposium on Earth Reinforcement v.1 Numerical Simulation of Beam-Shaped Soil Structure Reinforced by Geosynthetics Ohta,H.;Goren,S.;Iizuka,A.;Yamakami,T.;Yamagishi,K.;Moroto,N.
  14. Sixth International Conference on Geosynthetics Application of Dilatancy Models to Solis Reinforced by Geosynthetics Ohta,H.;Hirata,M.;Iizuka,A.;Yanakami,T.;Yokota,Y.;Ohmori,K.
  15. Proc. Specialty Session 9, 9th International Conference on Soil Mechanics and Foundation Engineering Induced Anisotropy and Time Dependency in Clays Sekiguchi,H.;Ohta,H.
  16. Technical Report of Disaster Prevention Research Institute, Kyoto University v.6 On the Volume Change of Normally Consolidated Clays Shibata,T.