블록형 보강토 옹벽의 토압 특성 연구

An Experimental Study on Characteristics of Earth Pressure Distribution for Segmental Reinforced Earth Wall

  • 김진만 (한국건설기술연구원 지반연구부) ;
  • 조삼덕 (한국건설기술연구원 지반연구부) ;
  • 이정재 (대원 Eng. 토질부) ;
  • 백영식 (경희대학교 토목공학과)
  • 발행 : 2004.02.01

초록

보강토 공법은 공사비가 저렴하고 시공이 용이하다는 점에서 토목공학 분야의 실용적 측면에서 가치가 있으며 기술자에게 큰 매력을 줄 수 있을 만큼 그 구조가 충분히 단순하다는 것이다. 본 논문에서는 5개 현장을 대상으로 각종 계측기를 매설하여 보강토 옹벽 벽체에 작용하는 수평토압과 보강재의 인장변형률 및 인장응력, 전면블록의 수평변위 등을 측정하여 보강토 옹벽의 안정성 및 토압특성을 평가하였다. 평가 결과, 보강토 옹벽은 전면블록의 수평변위의 경우 0.19∼0.76%로 작게 평가되었으며, 보강재의 최대인장변위는 0.66∼1.98%로 경험적으로 고려되는 보강재의 설계 인장변형률인 5%에 휠씬 못 미치는 것으로 평가되었다. 한편, 토압분포 특성은 기존 설계 방법에 이용되는 랭킨 이나 쿨롱 토압 분포 형태와 달리 연성 토류벽체에 작용하는 사다리꼴 형태의 토압분포를 나타내었다.

Retaining walls with reinforced earth have been constructed around the world. The use of reinforced earth is a recent development in the design and construction of earth-retaining structure. It is believed that reinforced retaining wall has some advantages which make construction quite simple basically. It wilt take short construction time relatively, comparing, fur example with reinforced-concrete retaining wall. In addition, low price and easy construction will be good attractive points in practical point of view. In this study, five field-tests monitoring data for lateral pressures on geogrid-reinforced retaining wall have been compiled and evaluated. Based on field-tests it is found that horizontal displacements of the facing was measured to be about 0.19∼0.76% and that the maximum tensile strains of reinforcement was evaluated to be about 0.66∼1.98%. The maximum tensile strains, measured from each site, do not reach 5% of the practical allowable strain of the geogrid. And also it is found that the lateral pressure distributions of reinforced-earth retaining wall are close to a trapezoid shape like a flexible retaining wall system, instead of a theoretical triangular shape.

키워드

참고문헌

  1. 한국건설기술연구원, 연구보고서 2000-067 블록형 보강토 옹벽의 현장 계측 및 안정성 평가 조삼덕;김진만
  2. Proceedings of the Symposium on Earth Reinforcement Study of the Soil Reinforcement Friction Coefficient Bacot,J.;Iltis,M.;Lareal,P.;Paumier,T.;Sanglerat,G.
  3. Master of science. sc. Thesis, University of Alberta Geogrid pull-out Tests in Clay Costalonga,M.A.R.
  4. Geotextiles and Geomembranes v.12 Geosynthetic-reinforced Soil Wall Design Claybourn,A.F.;Wu,J.T.H. https://doi.org/10.1016/0266-1144(93)90047-R
  5. 44th Canadian Geotechnical Conference Pull-out Resistance of Geosynthetics Fannin,R.J.;Raju,D.M.
  6. Geotextiles and Geomembranes v.12 Hyperbolic Expression for Soil-geosynthetic or Geosynthetic-geosynthetic Interface shear strength Giroud,J.P.;Darrasse,J.;Bachus,R.C. https://doi.org/10.1016/0266-1144(93)90030-R
  7. Ground Engineering v.17 A Laboratory Investigation of Soil-geotextile Friction Ingold,T.S.
  8. Geotech. Test J. Some Observation on the Laboratory Measurement of Soil-geotextile Bond Ingold,T.S.
  9. Proc. of Symp. on Geotextiles for Soil Improvement Pull-out Response of Geotextiles and Geogrids Juran,I.;Knochenmus,G.;Acar,Y.B.;Arman,A.
  10. Ph. D. Thesis, Cambridge University Some effects of Reinforcement on the Mechanical Behaviour of Soil Jewell,R.A.
  11. Ind. Geotech. J. v.18 Evaluation of Soil-reinforcement Friction Kate,J.M.;Rao,G.V.;Tyagi,S.K.
  12. Geotechnique v.39 Scale and other Factors Affecting the Results of pull-out Tests of Grids buried in Sand Palmeira,E.M.;Milligan,G.W.E. https://doi.org/10.1680/geot.1989.39.3.511
  13. Geotechnique v.38 Discussion on Direct Shear Tests on Reinforced Soil by Jewell & Wroth(1987) Palmeira,E.M.
  14. Ind. Geotech, J. v.18 Evaluation of Geotextile-soil Friction Rao,G.V.;Pandey,S.K.
  15. Proc. of Int. Symposium on Earth Reinforcement Practice Keynote Lecture: A Review of the Behaviour of Reinforced Soil Walls Rowe,R.K.;Ho,S.K.
  16. Proceedings of the Symposium on Earth Reinforcement Friction in Reinforced Earth Schlosser,F.;Elias,V.
  17. Ind. Geotech, J. v.18 Effect of Soil Parameters on Friction Coefficient between Soil and Reinforcement Sridharan,A.;Sing,V.
  18. Ind. Geotech. J. v.16 An Experimental Study on Mild Steel as Soil Reinforcement Sridharan,A.;Sing,V.
  19. Proceedings of the Indian Geotechnical Conference Friction Coefficient in Reinforced Earth Sridharan,A.;Singh,V.
  20. Geotextiles and Geomembranes v.12 Evaluation of Interfacial Frictional Resistance Srinvasa Murthy,B.R.;Sridharan,A.;Bindumadhava https://doi.org/10.1016/0266-1144(93)90028-M