基于沥青混合料细观结构的劈裂试验数值模拟  

Numerical Simulation of Spli Test Based on Microstructure of Asphalt Mixture

作　　者：陈斯宁[1] 赵俊明 陈红斌 

机构地区：[1]宿迁市高速公路建设指挥部,江苏宿迁223800 [2]苏交科集团股份有限公司,江苏南京210017

出　　处：《现代交通技术》2016年第4期11-15,共5页Modern Transportation Technology

摘　　要：为了分析非均质性对沥青混合料劈裂试验的影响,文章基于沥青混合料CT扫描图像,利用数字图像处理技术获取细观几何结构信息,结合推进波前法(Advancing Front Technique,AFT)网格剖分技术生成沥青混合料细观网格模型,进一步进行材料属性定义、边界条件约束和加载来模拟劈裂试验过程。从时间和空间角度剖析了沥青混合料细观结构的应力应变分布规律,研究结果表明:随着加载时间的增加,水平应力应变、竖向应力应变和剪切应力应变均以不同的速率逐渐增加,竖向应力应变大于水平应力应变,剪切应力应变最小;整体上,应力应变在竖向两端处最大,中心位置处次之,水平两端处最小;竖向两端处和中心位置最容易出现裂缝。In order to analyze the influence of heterogeneity on asphalt mixture split test, a microscopic finite element（FE） modeling of asphalt mixtures was obtained base on CT computed technique, digital image processing and finite element method. Firstly, the geometry information of microstructure was identified by digital image processing. Secondly, mesh model of microstructure was generated with advancing front technique（AFT）. Finally, the material properties, boundary conditions and loading were used to simulate the process of splitting test, and the stress and strain distributions of the asphalt mixture were analyzed from the perspective of time and space. The results indicated that horizontal stress strain, vertical stress strain and shear stress strain increased gradually with the increase of the loading time, and vertical stress strain was greater than horizontal stress strain, while shear stress strain was the smallest; on the whole, the stress and strain in the vertical ends was the biggest, the center position was second, the horizontal ends was the smallest; the vertical ends and the center position were the most easily cracking.

关 键 词：沥青混合料 细观结构 有限元法 劈裂试验 

分 类 号：U414[交通运输工程—道路与铁道工程]