Microscopic Analysis of Asphalt Mixture under Uniaxial Compression Based on Discrete Element
In order to explore the influence of uniaxial compression process on the composition struc-ture of asphalt mixture at the microscopic level,the uniaxial compression test of asphalt mixture was simulated based on three-dimensional discrete elements.The characteristics of stress-strain,voidage,particle displacement,crack development and contact force of asphalt mixture were analyzed,and the advancement and feasibility of the uniaxial compression test simulated by discrete elements were veri-fied.The results show that in the uniaxial compression test,the void of the specimen decreases slowly first and then increases rapidly,and goes through the stage of compacting-crack generation and devel-opment-failure.The displacement direction of the specimen particles is the same as that of the loading force.During the loading process,the displacement size of the specimen decreases from the two ends to the middle,and the distribution of the particle displacement presents an approximate symmetrical distribution.At the end of the loading,the distribution of the particle displacement presents a 45°in-clination angle.Corresponding to the displacement of particles,the crack generation also presents a law of development from two ends to the middle,and finally forms an X-type crack zone.In the uni-axial compression process,the contact force distribution between particles is relatively uniform,and with the progress of loading,the contact force between particles gradually becomes sparse,which leads to the reduction of compressive strength.
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