To analyze the influence of ruts on the internal voids of permeable asphalt mixtures,with the permeable asphalt mixture PAC-13 as the research subject,rut tests are conducted on asphalt mixture specimens formed according to the upper limit and median particle size distribution.The variation of ruts and void ratio at the wheel track are obtained.Based on the rut test data,the discrete element software PFC 2D is used to establish a discrete element particle simulation model of permeable asphalt mixtures from a microscopic perspective.The study analyzes the variation of internal voids and interparticle contact forces during the formation of ruts in permeable asphalt mixtures,taking into account the effect of specimen thickness on void ratio.Research results indicate that the void ratio in asphalt mixtures changes more significantly at the wheel load application area than in other parts.Under the same load,the void ratio change in asphalt mixtures with median particle size distribution is smaller than that in mixtures with upper limit particle size distribution.As the model thickness of asphalt mixtures with upper limit particle size distribution increases,the change in void ratio decreases,and there is a lower trend in the transmission of interparticle contact forces downward.The interparticle contact forces at the bottom of the rut board are relatively small.A rut board with a thickness of 8 cm shows a significant change in void ratio at the load position,and as the distance from the surface increases,the magnitude of void ratio changes decrease.
关键词
透水沥青混合料/车辙试验/离散元法/空隙率
Key words
permeable asphalt mixture/wheel rutting test/discrete element method/void ratio
维普
万方数据