The Study Of Skeleton Structure For Asphalt Mixture Based On Discrete Element Method

The high-grade highway using asphalt mixture as its pavement material has been achiev-ing a rapid development in the accompany with human society. Designers have carried on a lot of research for the sake of better road. For a long time. However, researchers mostly raise plenty of assumptions to simplify the mixture model and conduct some indoor or outdoor tests with the purpose of studying the properties of the asphalt mixture. This method cannot make sure the variability of the results and it is wasting time and energy so that it has no practical value. Some people brought finite element method in the analysis of the asphalt mixture and then realized its limitation on dealing with contact problem. The pavement damage is becoming more and more serious when people’s research continue to comprehensively and thoroughly.Optimal design for asphalt mixture is a effective method to prevent asphalt pavement from beening damaged earlierly,。Here PFC3D will be used in analysising asphalt mixture on the theory of micromechanics. We choose The Contact-Bond Model and The Slip Model along with different factors to study how they affect the performance of HMA so as to get the value In line with the practical engineering. Then we analyse how the gradation affect the performance(mainly for the compressive strength, Moore-coulomb strength, compressive resilience modulus and poisson’s ratio) of HMA such as AC16、SMA16and OGFC13and summed up some mechanics indexes for the performance evaluation of the skeleton structure and the basic rule of mutual interference phenomenon. At last we make a preliminary analysis of the interference phenomenon and find it is more appropriate to set the0.15to0.22times of The largest nominal diameter as the demarcation point for mixtureWe hope this study could provide a new direction and reference to accelerate people’s awareness of asphalt mixture and to promote the development of gradation design theory.