Research On The Development Law And Prediction Method Of Rutting On Asphalt Pavement Based On Accelerated Loading Test

Rutting is one of the main disease types of semi-rigid asphalt pavement.It is very important to master the rutting evolution law and establish reasonable rutting prediction model for long-term preservation of asphalt pavement structure.There are advantages and disadvantages in laboratory test,accelerated loading test and numerical simulation in the research of rutting on asphalt pavement.Therefore,in this paper,the rutting estimation parameters of asphalt pavement were obtained and analyzed by means of indoor test and outdoor monitoring,relying on the second major special project of jiangsu Province during the13th Five-Year Plan period:"Mechanical Response Monitoring and Full-scale Test Research of Expressway Asphalt Pavement Structure".The rutting evolution law of full scale test was studied and the prediction model of full scale test rutting was established and verified.The differences and similarities between different scale rutting prediction test methods were compared,and a cross-scale correlation method among laboratory test,scale test and full scale test was proposedFirstly,the dynamic modulus test,local dynamic creep test and FWD test were carried out to analyze the variation of structural properties of the full-scale test track,and the damage evolution equation of material parameters was established,which provided material parameters for rutting prediction.Based on the measured data of annual air temperature field and road surface temperature field,the variation law of temperature field in different months was analyzed,and a double sine regression model of temperature field of asphalt pavement in different months and different road depths was established to provide temperature field parameters for rutting prediction.Secondly,based on the measured mechanical response data,the evolution law of mechanical response of asphalt surface in full-scale test track is studied,and the prediction equations of mechanical response about temperature,velocity and axle load are established.By means of numerical simulation,the structural parameters of full scale test road are reversed and corrected,and the difference between indoor material parameters and pavement structural parameters is compared.Based on the measured data and numerical simulation,the key mechanical indexes of typical structures were summarized to provide a reference for pavement maintenance decision.Then,the three-stage characteristics and deformation mechanism of rutting evolution were analyzed based on the rutting data of foot-foot test track during 1 million loading cycles.Through numerical simulation,the rutting prediction model of full-scale test track is established and verified.Based on the prediction model,the relationship between the load times of full scale test and the cumulative load times of actual pavement in service life was established,and the influence of high temperature and heavy load on the rutting development of typical structures was estimated.Finally,through the indoor triaxial test,the prediction equation between the shear parameters of the asphalt mixture and the number of unstable rheology is deduced;through the scale test,the rutting prediction model of the scale test is established and verified;through the comparative analysis,the relationship between the number of unstable rheology F_N,the number of loading times M_N in the scale rutting test,and the number R_N in the full-scale rutting test were studied,and the parameters of the triaxial test,the scale test,and the full-scale test were established.cross-scale connections.