Influence of Asphalt Concrete Thickness
on Settlement of Flexible Pavements

 

Gholam Ali Shafabakhsh

Associate professor, faculty of Civil Engineering
Semnan University, Semnan, Iran
e-mail: shafabakhsh@semnan.ac.ir

Mana Motamedi

M.Sc student, faculty of Civil Engineering
Semnan Universit, Semnan, Iran
e-mail: mana.motamedi@gmail.com

Afshin Family

M.Sc student, faculty of Civil Engineering
Semnan University, Semnan, Iran
e-mail: family.afshin@gmail.com

 

 ABSTRACT

Previously, the design and analysis of flexible pavements had been performed based on semi-experimental methods, using elastic characteristics of pavement layers. It is better to replace the design and analysis of pavements with fast and powerful software including finite element and discrete element methods, due to complex interference to different materials and layers and its time consumption. The finite element method requires less computational power and it is more suitable for continuous environments. Many studies have shown that using the linear elastic model for prediction of pavement vertical structure strain and stress results in errors, especially in low thickness layers of asphalt pavement. In order to solve this problem, a Drucker-Prager elasto-plastic model is used to consider standard deviation modeling, which is used for the pavement layers. This research, at first, tends to investigate influence of changing asphalt pavement thickness in vertical strain using finite element software (ABAQUS) and finally, the results related to the finite element, were compared with experimental data. Using finite element method, maximum strain of pavement layers was computed for four thicknesses of 50, 80, 100 and 120 mm for two elastic and elasto-plastic behaviors and finally they were compared with the experimental results.

Keywords: finite element; vertical deformation; pavement thickness; flexible pavement.

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