车辙历程中的集料细观运动追踪方法及其应用

研究集料运动规律是理解车辙细观机理的有效途径。采用X-ray CT获取沥青混合料在车辙试验前后的位移变化情况。在改造的车辙试验中采用黄铜矿(CuFeS2)作为集料替代物,应用该方法成功地从集料细观运动角度描述了车辙历程。研究结果还表明：车辙发展过程中,试验轮正下方的混合料保持较完好的骨架结构,而车辙区域两侧边缘的粗集料多数向上运动,无法形成有效的骨架结构；并通过构建有限元模型,验证以矿石替代集料、结合CT和图像处理技术的集料追踪方法是合理有效的。

Tracking Method of Aggregate Meso-motion in Rutting Process and Its Application

A tracking method of aggregate based on computed tomography (CT) and image processing was proposed. In the modified rutting test, chalcopyrite (CuFeS2) was used as a substitute of aggregate, and the method was applied to successfully describe the rutting process from the aspect of aggregate meso-motion. The results also showed that: during the development of rut, the mixture directly below the test wheel still maintain a relatively intact skeleton structure, while the coarse aggregates on both sides of the rutting area mostly move upwards, unable to form an effective skeleton structure; compared with the displacement nephogram, the finite element model is accurate in simulating the rutting depth, but it cannot reflect the mesoscopic changes inside the mixture.