A 3D FEM ANALYSIS OF CREEP DEFORMATION LAW OF ASPHALT PAVEMENT BASED ON BURGERS VISCOELASTIC MODEL

Aiming at the creep deformation problem of asphalt pavement under different temperature conditions， taking Burgers model as the theoretical basis，using the data analysis software Origin 8. 1 a fitting analysis of different temperature creep test curves was done to get the four creep equation parameters of Burgers model，and the Burgers creep equation was changed into Prony series by Laplace transform and inverse Laplace transform． Through these processes，the relative relaxation moduli g1 ，g2 and relaxation time 1 ，2 were got，which were associated with temperature of asphalt mixture． The distribution of creep deformation of asphalt pavement under the different temperature and loaded time conditions were analyzed by 3D FEM． The results show that under different temperature conditions the lateral extent of creep deformation at pavement surface is 0. 88 m，and the scope of deformation extending to the outside wheel track is wider than that of the inside． The higher the temperature，the greater the strain of pavement surface，strain mutation will appear on the surface at 60 ℃． When the pavement withstands 5. 4 106 total number of equivalent standard axle load，1 cm rut will be produced，which raises a higher requirement for high temperature stability of asphalt pavement．