Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
권호 표지

Analysis of Time-Dependent Deformation of Expanded Polystyrene (EPS) Geofoam as a Flexible Pavement Subgrade Material

연성포장의 노반재료로써의 EPS 지오폼의 시간의존적 변형 분석

  • Park, Ki-Chul (Dept. of Civil Engineering, Dongseo University) ;
  • Ramaraj, Babu (Dept. of Civil and Environmental Engineering, South Dakota School of Mines and Technology) ;
  • Chang, Yong-Chai (Faculty of Ocean System Eng. Mokpo National Maritime University)
  • Received : 2010.09.07
  • Accepted : 2010.09.24
  • Published : 2010.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

The main objective of this study is to investigate the time-dependent deformation of EPS blocks under repeated loading conditions which is the one of the flexible pavement structure. The study comprised of both the experimental work and analytical modeling in order to understand the behavior of EPS blocks under repeated loading. The analytical modeling included the selection of a suitable model for describing the deformation behavior observed under repeated loading conditions, investigating the relationship among the unit weight, deformation and applied stress, analyzing the effect of repeated load on deformation. The test results were compared with the Findley's theory and model analysis with the results of this research under repeated loading conditions. Both Modified Findley's model and the proposed model can be adopted to illustrate the deformation behavior of EPS blocks under repeated loads.

본 연구의 주된 목적은 반복적인 하중조건하에서 연성포장체의노반재료로써, EPS블럭의 시간의존적 변형을 연구하는데 있다. 반복하중 조건에서의 EPS블럭의 거동을 이해하기 위해서 본 연구에서는 실험적 방법 및 수치모형을 제시하였다. 이 수치모델링을 위해서 반복하중 조건하에서 관찰된 변형거동과 단위중량, 변형 그리고 적용된 하중과의 상관관계의 조사가 행해졌다. 실험결과는 핀들레이 이론과 반복하중 조건에서의 연구결과의 모델 분석등과 비교되었고, 보완된 핀들레이 모델과 본 연구에서 제시한 모델은 반복하중에서의 EPS블럭의 변형거동을 나타내는데 이용될 수 있는 것으로 기대된다.

Keywords

References

  1. Findley, W. N. and Koshla, G. (1956), "An Equation for Tension Creep for Three Unfilled Thermoplastics", SPE Journal, Vol.12, No.12, pp.20-25.
  2. Frydenlund, T. E. (1987), Plastic foam in road embankments. Meddelelse 61, Norwegian Road Research Laboratory. pp. 7-12.
  3. Findley, W. N. (1960), "Mechanism and Mechanics of Creep of Plastics", SPE Journal, Vol.16, No.1, pp.57-65.
  4. Horvath, J. S. (1998), Mathematical Modeling of the Stress- Strain-Time Behavior of Geosynthetics Using the Findley Equation: General Theory and Application to EPS-Block Geofoam, Research Report No. CE/GE-98-3, Manhattan College, Bronx, N.Y., U.S.A.
  5. James F. Horbay. (1984), Lightweight Fills for Embankment Construction, Thesis Report, School of Engineering, Lakehead University, May. 1984.
  6. Yue, Wu (1996), An Investigation of Long-Term Behavior of EPS Blocks Under Static & Repeated Loads, Thesis Report, South Dakota School of Mines & Technology, Rapid City, U.S.A.