Dynamic Response Analysis Of Asphalt Pavement In Stress-Temperature United Field

In the process of use,except for the effect of repeated directly under the driving load,asphalt pavement also subjected to periodic effect of temperature stress,it led to the emergence of crack, rut, seriously affect the service life. Therefore, actively carrying out the analysis of the mechanical behavior of asphalt pavement damage under multi field coupling and mastering the failure characteristics and failure mechanism of asphalt pavement structure is crucial for the prevention and control of failure for asphalt pavement.In this paper, the stress model, temperature model and temperature stress model were established by using the finite element software ABAQUS. Through adding the stress of each unit in the temperature-stress model to the stress model by the way of initial stress,we established the temperature-stress model, which is based on the stress model. Through the subroutine function of the software, we analyzes the influence of speed, axle load and the thickness of the surface layer for pavement structure. Through the output function of the software, we analyses the the variation law of stress and strain of each structure layer in the stress model and temperature-stress model, and analyses the model’s different response of single field’s effect and multiple field’s effect by contrasting the data. We analyses the process of asphalt pavement’s fatigue damage and research the calculation method of fatigue life.We computing the rut of asphalt pavement in the circumstance of continuously change of temperature.Research shows that, under moving loads, the stress and strain in the internal layers of the pavement structure shows the characteristics of volatility and transient; The temperature and temperature stress of pavement shows the characteristics of periodically change, and the change weakened gradually with the increasing of depth; The pavement structure’s response is different in single field’s effect and multiple field’s effect, the variation of maximum is horizontal stress and vertical stress. Through the establishment of test sections, we monitored the data of stress and strain and contrasted the simulated data and monitoring data, and verified the reliability of the model finally.