Analysis Of Asphalt Pavement Rutting Under Canalized Traffic Conditions

In recent years,with the improvement of China’s urban traffic infrastructure,the number of motor vehicles is also increasing rapidly,which leads to a series of traffic problems such as congestion and blockage.The emergence of channelized traffic has effectively alleviated the traffic pressure of the city.However,under the condition of channelized traffic,asphalt pavement is more prone to rutting,moving,hugging and other diseases,which affects the safety and comfort of driving.Therefore,it is necessary to accurately analyze and predict the rutting of asphalt pavement under the condition of channelized traffic.In this paper,ABAQUS finite element software was used to establish the threedimensional model of asphalt pavement.Taking Changsha as an example,the change of pavement temperature field in typical months was analyzed,the rutting varying laws and related influencing factors of asphalt pavement under continuous variable temperature were studied.(1)This paper analyzed and summarized the rut formation mechanism and influencing factors of wheel track in asphalt pavement,and introduced the relevant theory of heat conduction and viscoelastic model.(2)This paper collected the meteorological data of typical months in Changsha,analyzed the temperature field distribution of asphalt pavement structure by using ABAQUS finite element software,and studied the influence of different thermophysical parameters on the temperature field.The results show that during the 24-hour period of January,April,July and October,the change trend of asphalt pavement temperature and external ambient temperature is basically the same.At noon in January,April,July and October,the temperature of road surface is much higher than the external ambient temperature.There will be a certain delay in the process of heat transfer from the road surface.The deeper the structural layer is,the time to reach the maximum temperature is longer;the selection of pavement structure with relatively low heat radiation and rutting emissivity can effectively reduce the heat absorption rate of pavement structure.(3)Using the "static instead of dynamic" loading method and importing the temperature field result data,this paper studied the rutting varying laws in all seasons of the year under the condition of continuous variable temperature and the rutting varying laws under different load times,and analyzed the influence of driving speed,ambient temperature,ground stress and other factors on the rutting index.The results show that larger amount of rutting is also likely to occur during peak hours with heavy traffic flow and high temperature in the afternoon;vehicles are more prone to rutting when the driving speed is lower,the tire ground pressure is higher,and the ambient temperature is higher;the effect of rutting performance is the most significant,followed by tire ground pressure and driving speed,respectively.