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   Behavior of Flexible Pavements on Expansive Soils  
   
نویسنده Djellali Adel ,Ounis Abdelhafid ,Saghafi Behrooz
منبع International Journal Of Transportation Engineering - 2012 - دوره : 1 - شماره : 1 - صفحه:1 -14
چکیده    This investigation discusses the findings on analysis results of a pavement structure constructed on a relatively ex-pansive material consisting mainly of brown clayey silt in tebessa, algeria. cores were taken to 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 description of the behavioral characteristics of expansive soil as it relates to flexible pavements. 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 results showed that the com-bined model mohr-coulomb in the pavement structure and the soft-soil in subgrade accord perfectly with deforma-tions taken on the existing pavement. to stabilize the swelling character of subgrade, an adequate surcharge pressure is used according to the procedure described in the paper. it showed that after 9 months, the deformations have been stabilized at -0.007 m without any cracks in the pavement
کلیدواژه Flexible Pavements ,Expansive Subgrades ,Soil Calibration ,Oedometer Test ,Soil Behavior ,Finite Element Method
آدرس University Mohamed Khider Of Biskra, Civil Engineering And Hydraulic Department, Algeria, University Mohamed Khider Of Biskra, Civil Engineering And Hydraulic Department, Algeria, Tarahan Parseh Transportation Research Institute, ایران
 
     
   
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