Study On The Development Tendency Of Rutting And Numerical Simulation Based On Accelerate Pavement Test

Rutting is a major asphalt pavement distress in most areas of China, it ocoured commonly not only in the southern regions of China，but also in north cold region，such as Liaoning Province. The core of controling rut depth is predicting the potential rutting level practically and reasonably. The influence factors on rutting damage is complex and interactional, the laboratory experiments cannot simulate the actual road environment and loading condition accurately, and the observation on long-term performance of pavement takes too long and costs too much. Comparedly, accelerated pavement test(APT)can more realistically simulate natural environment and actual stress of the pavement, and obtain the decay law of pavement performance and pavement behavior in a relatively short period of time.Taking account of this advantage, it is widely adapted in the study of pavement materials and structure design. Therefore, the accelerated pavement test is an advanced and reliable method in the study of rut development regulation. The main contents in this paper are as follows：（1）The condition parameters、environmental factors and measurements method are briefly introducted. Based on the experimental data of different pavement structure，the author analyzed the development regulation of rutting on different pavement structure, summarized the characteristics of rutting depth development trend and rut profile shape,and identified the main effect factors of rutting.（2）Based on multivariate regression analysis，a rutting prediction model based on APT is achieved. Besides that, the uplift coefficient of rutting is determined according to the experimental data, the results show that uplift coefficient value is related to surface layer thickness, and the range the range of uplift coefficient is given. In order to make the prediction model can apply to other situations, the axle load and wheel speed conversion based on APT was preliminary studied, determined the conversion criteria and applied to the prediction model.（3）The rutting development regulation of semi-rigid asphalt pavement under the condition of high temperature was simulated using the finite element program ABAQUS, the creep data of the asphalt layer materials was obtained by dynamic creep test, comparisons of the numerical simulation results and experiment results are made to validate the reliability of of numerical simulation method.