• Journal of the Korean Geosynthetics Society
• /
• v.14 no.2
• /
• pp.35-44
• /
• 2015

The resilient modulus model of EPS geofoam to be used for a flexible pavement design was developed. In this study, the model was applied to design the flexible pavement and to predict the magnitude of the deformation of EPS geofoam blocks as a subgrade in the flexible pavement structure by using the resilient modulus model of EPS geofoam (RMEG) program. The RMEG program presented how much the EPS geofoam subgrade settled over the designed duration and the AASHTO flexible pavement design equation with the resilient modulus of EPS geofoam noted that how long the flexible pavement endured under traffic loads with 70% reliability for the estimated duration with less than 5mm vertical deformation during 20.6 years without the significant pavement distress as a substitute material for the natural soils.

• Journal of the Korean GEO-environmental Society
• /
• v.12 no.12
• /
• pp.63-70
• /
• 2011

Expanded Polystyrene (EPS) is a type of geosynthetic material manufactured with various strengths, unit weights, and dimensions. Due to recent advances in research on EPS, the use of EPS has increased dramatically. This super light weight material has a unit weight of approximately $0.16{\sim}0.47kN/m^3$, equivalent to 6.3~15.7 of that of most natural soils with conditions of fill materials. In spite of this advantage, it is noted that no standard method of resilient modulus test on EPS geofoam was reported and no literature on resilient modulus test methods for EPS geofoam exist. The main object of this study was to investigate feasibility of the resilient modulus of EPS when it was applied for flexible pavement. The investigation of the feasibility was completed based on the results from triaxial tests.

• Journal of the Korean GEO-environmental Society
• /
• v.3 no.2
• /
• pp.5-14
• /
• 2002

In this study, stress-deformation characteristics of buried pipe are studied. A numerical model, i.e., Egg-Cam Clay is introduced for the analysis of soft clay. Cam Clay model has a difficulty in analyzing soft clay that has two properties of shrinkage and swelling. Egg-Cam Clay model is modified format of Cam Clay model. In addition, Mohr-Coulomb model using finite element method is employed to verify effects of the geogrid, EPS geofoam. Stress deformation of several cases of pipe and other reinforcemnt material combinations are analyzed. Geofoam and geogrid have positive effects on the deformation characteristics.

• Journal of the Korean Geosynthetics Society
• /
• v.9 no.3
• /
• pp.57-65
• /
• 2010

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.