Tarrahan Parseh Transportation Research Institute International Journal of Transportation Engineering 2322-259X 1 1 2013 01 01 Behavior of Flexible Pavements on Expansive Soils 1 16 2626 10.22119/ijte.2013.2626 EN Adel Djellali Assistant Professor, Department of Civil Engineering and Hydraulics, University of Mohamed Khider, Biskra, Algeria Abdelhafid Ounis Assistant Professor, Department of Civil Engineering and Hydraulic, University of Mohamed Khider, Biskra Algeria Behrooz Saghafi Assistant Professor, Tarahan Parseh Transportation Research Institute, Tehran, Iran Journal Article 2012 08 22 This investigation discusses the findings on analysis results of a pavement structure constructed on a relatively expansive material consisting mainly of brown clayey silt in Tebessa, Algeria. Cores were brought to the laboratory from a piece of roadwork. Remolded samples were taken from subgrade of a deteriorated road. The soils were generally found to be of medium plasticity and of a medium to high expansion potential. Oedometer test for free swell indicated a constant volume pressure that produced stress in excess of 350 kN/m2. The following involves describing the behavioral characteristics of expansive soil as it relates to flexible pavements. Soils are generally classified using the X-ray diffraction [XRD]. Computer code Plaxis 8.2 was used for numerical simulation to check the behavior of structure pavement with three models in pavement structure, and free expansion test was performed to calibrate the soil subgrade with Soft-Soil model. The study is based upon simulating the vertical subgrade soil displacement during traffic load, and its influence on load-settlement on flexible pavement behavior. To stabilize the swelling character of subgrade, an adequate surcharge pressure is used according to the procedure described in the article. http://www.ijte.ir/article_2626_e354fd90b2d5c777bfec87a352a18976.pdf