ABSTRACT

Aggregate structure plays a significant role in the pavement performance of road materials. However, there is a lack of fundamental understanding of mechanical characteristics and evolution characteristics of the aggregate structure in the existing research. To understand this complex structure, laboratory tests and numerical simulations using the discrete element method were used to investigate macroscopic mechanical properties of aggregate structure and microscopic aggregate contact forces, thus revealing the mechanical role of each size aggregate and evolution characteristics of the aggregate structure. Based on this, the specification gradations of road materials were optimised to build a strong aggregate structure. Laboratory tests and engineering application show that road materials using the proposed gradation can exhibit improved pavement performance and engineering effects.

摘要

骨料结构对道路材料的路面性能起着重要作用。然而，现有的研究对骨料结构的力学特性和演化特征缺乏基本的认识。为了解这种复杂结构，采用离散元法的实验室试验和数值模拟研究了骨料结构的宏观力学性能和微观骨料接触力，从而揭示了各种尺寸骨料的力学作用和骨料结构的演变特征。在此基础上，优化道路材料的规格级配，构建坚固的骨料结构。