基于离散元方法的橡胶颗粒沥青路面破冰性能分析

Analysis of Ice-breaking Performance of Rubber Particle Asphalt Pavement Based on Discrete Element Method

为研究橡胶颗粒的粒径大小及含量对沥青路面破冰性能的影响,从细观力学角度分析了橡胶颗粒路面的破冰机理,从能量守恒角度基于应变能分析了橡胶颗粒对路面破冰性能的影响.运用离散元方法分别从不同橡胶颗粒含量、同一含量下不同橡胶颗粒大小及单一粒径的橡胶颗粒、混合粒径的橡胶颗粒对橡胶颗粒除冰性能的影响进行了分析,并探讨了橡胶颗粒路面在不同冰层厚度下的破冰效果.结果表明:路面结构的应变能越大,其破冰能力越强;在橡胶颗粒含量为3%时冰层法向接触力最大,路面破冰效果最好;在含量一定的情况下适当增加细橡胶颗粒的含量可以提高路面的破冰能力;在冰层厚度为1 mm时,路面结构的破冰能力最好,随着冰层厚度的增加,路面破冰效果减弱.

In order to study the effect of particle size and amount of rubber particles on ice breaking performance of asphalt pavement,in this paper,the ice breaking mechanism of rubber particle pavement is analyzed from the viewpoint of micro-mechanics,and the influence of rubber particle on the ice-breaking performance of pavement is analyzed from the viewpoint of energy conservation based on strain energy.Discrete element method is used to analyze the influence of different rubber particle content,different rubber particle size under the same dosage,single particle size and mixed particle size on the de-icing performance of rubber particles,and the ice-breaking effect of rubber particle pavement under different ice thickness is discussed.The results show that the larger the strain energy of the pavement structure is,the stronger the ice-breaking ability is.When the rubber particle content is 3%,the normal contact force of the ice layer is the largest,and the ice-breaking effect is the best.If,under the certain condition,the amount of fine rubber particles is properly added,the ice-breaking capacity of the road surface can be improved.When the ice thickness is 1mm,the ice-breaking ability of pavement structure is the best.With the increase of ice thickness,the ice-breaking effect of pavement decreases.