橡胶颗粒沥青混合料破坏机理微观分析

以间断级配橡胶颗粒沥青混合料为例,采用随机抽样原理的细观建模法建立离散元微观模型,分别从颗粒位移、粘结接触面破坏两个方面,分析了荷载作用下橡胶颗粒沥青混合料微观破坏机理。研究结果表明:含橡胶颗粒的区域位移变形程度远大于无橡胶颗粒的区域;橡胶颗粒附近容易发生变形,引起混合料的骨架结构错动,导致沥青混合料粘结性能变差,路面出现剥落、松散破坏。

Microanalysis of Failure Mechanism of Rubber Particle Bituminous Mixture

Taking the gap grading rubber particle bituminous mixture for example,the discrete element micro model was established by using the microscopic modeling method with random sampling principle.The failure mechanism of rubber particles bituminous mixture was analyzed from two aspects:particle displacement and bonding surface.Research shows that the deformation of region with rubber particles is much larger than that of the area without rubber particles.Rubber particles are easily deformed.The skeleton structure of mixture is easily displaced,resulting in the deterioration of adhesive properties of bituminous mixture,peeling and loose damage of road.