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为了真实反映沥青混合料内部非均质(集料、胶浆和空隙)多层次(矿料级配)结构特性,首先将粗集料颗粒的形态特征抽象为二维凸多边形,提出了单个集料的随机延拓算法;其次,结合区域内多个集料的随机投放技术,实现了包含凸多边形粗集料、矿料级配、沥青胶浆以及空隙的沥青混合料二维数字试件的重构;再次,运用颗粒流程序PFC2D建立了离散元模型,实施了切口小梁三点弯曲虚拟试验。研究结果表明,所提出的随机生成算法独立于室内试验条件,无需大量试件、昂贵设备以及繁琐图像处理工作;虚拟试验结果相比室内试验更为稳定,进一步体现了随机算法构建数值模型的优势。
In order to truly reflect the heterogeneous (aggregate, glue and voids) internal structure of asphalt mixture, the morphological characteristics of coarse aggregate particles are first abstracted as two-dimensional convex polygons, and a single set Secondly, combined with the random placement technology of multiple aggregates in the area, a two-dimensional digital specimen of asphalt mixture containing convex polygon coarse aggregate, mineral aggregate gradation, asphalt mortar and void was realized Reconstruction; Thirdly, a discrete element model was established by using the particle flow program PFC2D, and a virtual experiment of three-point bending of notch trabecular was carried out. The results show that the proposed random generation algorithm is independent of the experimental conditions in the laboratory and does not require a large number of samples, expensive equipment and cumbersome image processing. The results of the virtual experiment are more stable than those of the indoor experiment, which further embodies the advantages of the stochastic algorithm in constructing numerical models .