Analysis of Time-Dependent Deformation of Expanded Polystyrene (EPS) Geofoam as a Flexible Pavement Subgrade Material
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초록
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.
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.
참고문헌 (6)
- Findley, W. N, "An Equation for Tension Creep for Three Unfilled Thermoplastics", SPE Journal, 12(12), pp.20~25 (1956)
- Frydenlund, T. E, "Plastic foam in road embankments. Meddelelse 61", Norwegian Road Research Laboratory, 7~12 (1987)
- Findley,W.N, "Mechanism and Mechanics of Creep of Plastics", SPE Journal, 16(1), pp.57~65 (1960)
- Mathematical Modeling of the Stress- Strain-Time Behavior of Geosynthetics Using the Findley Equation: General Theory and Application to EPS-Block Geofoam, "Horvath,J.S", Manhattan College, ~, pp.No. CE (1998), GE-98-3
- James F. Horbay, "Lightweight Fills for Embankment Construction", pp.1984
- An Investigation of Long-Term Behavior of EPS Blocks Under Static & Repeated Loads, "Yue,Wu", South Dakota School of Mines & Technology, ~ (1996)