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 doi:

DOI: 10.3724/SP.J.1249.2018.01039

## Comparison of two dimensional and three dimensional modeling methods on the mechanical response of asphalt pavement

• WANG Weina 1,2   LI Xiaofei 2   XU Qingjie 2   QIN Yu 3   YAN Qiang 4
• 1.National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, P. R. China;
• 2.School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, P. R. China;
• 3.CREEC(Chongqing) Survey, Design and Research Co. Ltd., Chongqing 400023, P. R. China;
• 4.Guangxi Trading Technology Co. Ltd., Nanning 530021, Guangxi Zhuang Autonomous Region, P. R. China

Abstract：
In order to quantify the differences between the two dimensional (2D) and the three dimensional (3D) finite element models of asphalt pavement, we establish the two kinds of models based on the finite element method under the consideration of the single static load and dynamic load. The displacement and stress spatial distribution characteristics of three kinds of typical asphalt pavement including the rigid pavement, the semi-rigid pavement and the flexible pavement, are analyzed. The numerical results of 2D modelling and 3D modelling on the displacement and stress are compared by combining the double tail significance test. The results show that the displacement of 2D model is over 15 times more than that of 3D model under static load, and it is 22 times more than that of 3D model under dynamic load. The stress of 2D model is 1.2~5.1 times of the stress of 3D model under static load and 2.6~11.9 times under the dynamic load. There is no significant difference between vertical stress and shear stress on the cross section under static load combined with the double tail significance level, and at this time the three-dimensional pavement structure can be simplified to two-dimensional plane.

Key words：road engineering,asphalt pavement,two dimensional model,three dimensional model,mechanical response,finite element method

ReleaseDate：2018-03-20 15:26:55

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