Back-calculation study on asphalt pavement using dynamic viscoelastic method
Cao Dandan1 Zhao Yanqing1 Tian Zefeng2 Wang Guozhong3
1. Dalian University of Technology， Dalian 116024， China；
2. The Communications Research Institute of Liaoning Province, Shenyang 110015, China;
3. Shanxi Transportation Research Institute, Taiyuan 030006, China
Abstract：Dynamic viscoelastic back-calculation of asphalt pavement was performed, and the spectral element method (SEM) was adopted as the forward analysis method. The validity of SEM for dynamic viscoelastic analysis of typical asphalt pavement structure was verified. The mean square error between the measured and calculated time-history curves of pavement surface deflection was used as the objective error function, and the sequential quadratic programming algorithm was utilized to optimize the mechanical parameters of asphalt pavement. The back-calculations were carried out for the asphalt pavement structure with semi-rigid base and composite base, respectively, and the results indicate that for the dynamic viscoelastic analysis, SEM can greatly enhance the computational efficiency. The complete viscoelastic parameters, including the dynamic modulus and the principal curves of phase angle obtained by back-calculation, could be employed to characterize the mechanical behavior and reflect the effects of loading frequency and temperature field. The defect of traditional back-calculation methods could be obviated by using the proposed approach, which can be used as an effective method for the analysis and quality assessment of asphalt pavement.
