Simulation Test Of Asphalt Mixture Rutting Based On Discrete Element Method

The highway is an important part of our transportation network,it plays an important transportation task,so the study of the nature of the highway is very necessary.The rutting problem has been widely studied as the most common form of damage to asphalt pavementIn the past research on rutting,most of the methods used at the beginning were theoretical derivation and experimental methods.With the development of science and technology,computer simulations began to rise.In the computer simulation study of asphalt pavement,most people use the finite element method.They asphalt mixture as a continuous medium,but it can not show the aggregate particles,so the paper uses discrete element method,aggregate researchThis paper focuses on rutting simulated by discrete element software EDEM,different pressure conditions to study the particle size is subjected.And the rutting process is described by the connection between the aggregates.At the same time,the asphalt mixture of continuous grading and intermittent grading is used in this paper to study the influence of aggregate sizeThrough simulation,it is found that the development trend of asphalt pavement ruts is from compacted ruts to unstable ruts.In the process of rut development,the bearing capacity of particles of different particle sizes is different,and the pressure carried by the particles is positively related to the particle size and size of the particles.Studies have found that particles with larger particle sizes serve as carriers,while particles with smaller particle sizes serve as fillers.However,if the particle size is too large,the particles will be easier instability,can not withstand the pressure.In the study of particle grading,it was found that the discontinuous grade asphalt mixture has a larger void ratio and a higher proportion of compacted ruts.