Stress Analysis Of Asphalt Pavement Under Temperature-Vehicle Load Coupling

China's current asphalt pavement design specification is based on the elastic layered system and the inter-layer deformation continuous structure,and is designed based on the asphalt pavement response under the consideration of vehicle load alone.However,in fact,the asphalt pavement is affected by the temperature and the vehicle dynamic load when it is exposed to the natural environment.Considering an external environmental impact alone,it cannot truly reflect the stress in the asphalt pavement structure.At the same time,the contact state between different asphalt pavement structural layers is not completely continuous,nor completely smooth,so the simple friction coefficient does not reflect the influence of adhesion.Differences between theoretical assumptions and actual conditions will directly affect the design and service life of the pavement structure.Therefore,this paper analyzes the dynamic response of asphalt pavement structure under the coupling of temperature load and vehicle dynamic load using ABAQUS finite element software.In the analysis process,the winter and summer temperature field prediction models in Dalian are established first,and the results are consistent with the measured temperature distribution results of the grating fibers.Taking this asphalt pavement structure as the research object,analyze the dynamic response of the cracked road surface and the crack-free road surface under the coupling of temperature and vehicle dynamic load in the cold winter conditions.Then,considering the influence of dynamic elastic modulus of asphalt surface layer and using the cohesive force model to simulate the interlayer contact relationship of asphalt pavement,the dynamic response of asphalt pavement under the coupling of temperature and vehicle dynamic load is analyzed.Finally,the influence of different overload vehicle loads on dynamic response of asphalt pavement under coupling action is analyzed.In order to make the analysis model of pavement structure more realistic,this paper considered factors such as crack,material properties and interlayer contact relationship when analyzing the dynamic response of asphalt pavement under the coupling of temperature and vehicle dynamic load.In addition,the simulation results of the grating fiber optic sensor are used to verify the simulation results.