Pavement Disease Environment And Dynamic Coupling Analysis Of Asphalt Pavement In High Temperature And Rainy Area

The high temperature and heavy rain are characterized as the climate character in Hainan province where the pavement damage is generally occured. The high temperature and axle load are the important factors resulting in rutting. The dynamic coupling action between infiltration water in pavement, asphalt pavement structure and traffic load are the main reason of water damage in pavement. Due to the special tropical environment in Hainan province, the asphalt selection, mixture design and pavement structure design are closely related to the climate of Hainan province, thus, the reasonable climate region and temperature distribution pattern are much significant for pavement design. Through the systematic investigation, field test, theoretic derivation and numerical calculation, the achievements can be drawn as follows:(1) The pavement disease and traffic conditions of highway main stem in Hainan province were investigated including asphalt pavement situation and performance, traffic volume and composition, axle load and overload, in order to synthetically analyze and sum up the reasons of asphalt pavement disease in Hainan province.(2) Based on the climate data collected in18typical areas in Hainan province, the software ArcGIS was employed to make regions by various methods in terms of high temperature, low temperature, rainfall and damp coefficient. Further, the index system and name of those factors were determined, base on which the8climate regions of Hainan province were made for contributing to pavement design.(3) The data of solar radiation, air temperature, wind speed and temperature distributed in pavement structure were collected through the field test. Based on the test results and heat transfer theory, the empirical-theoretical prediction model was established related to solar radiation, air temperature and wind speed, then, the prediction method of pavement temperature field was presented and the model parameters were analyzed and their suggestion values were given.(4) For the external condition of rutting formation, the finite element software ABAQUS was employed to analyze the rutting formation under the natural environment and traffic condition in Hainan province. Meanwhile, the comparison analysis of the rutting damage characteristics in Hainan province was made by comparing that of different areas such as Wuhan, Nanning and Guangzhou cities to emphasize the differences between Hainan and those areas and sum up the reason of rutting damage of pavement in Hainan province.(5) The general mechanical performance, change law of high temperature stability and influencing factors were studied under the without water condition, high temperature water condition and freeze-thaw cycle condition by referring to commonly used methods of simulating the water environment that the high temperature water and freeze-thaw cycle conditions. Further, the effects of mixture grading and porosity on the water stability of asphalt mixture were discussed.(6) Based on Biot's consolidation theory, the multi layers model "upper-lower surface course, base and sub-grade" subjected to moving traffic load was established to analyze the dynamic response of asphalt pavement. The Fourier series and Fourier transform method were employed to solve the model and the analytical solutions of seepage and stress fields were obtained. Based those calculation results, the different damage mechanism of upper and lower surface were examined and the effect of overload on the pavement disease was illustrated from the aspect of water damage.