作　　者： ; ;

机构地区： 东南大学交通学院

出　　处： 《建筑材料学报》 2009年第4期442-447,共6页

摘　　要： 根据建立的集料三维体积级配与二维数量级配关系式,编制了沥青混合料二维数字试件生成程序;结合离散元基本原理,建立了包括沥青混合料离散元模型、离散单元接触模式选择和疲劳失效判断标准在内的一整套沥青混合料虚拟疲劳试验方法;通过沥青混合料小梁虚拟疲劳试验,分析了集料分布特征对混合料疲劳性能的影响.结果表明:沥青混合料虚拟疲劳试验能真实模拟其疲劳过程,虚拟试验结果与真实试验结果相差无几,所建立的虚拟疲劳试验方法可以作为沥青混合料疲劳性能分析的辅助手段;集料分布均匀性对混合料疲劳寿命影响较大,混合料内粗集料分布较为密集的区域是最易疲劳损坏之处. The two-dimensional virtual structure fabrication procedure of asphalt mixture was formed based on the theoretical formula which was established to convert the volumetric gradation into the two-dimen-sional quantity gradation of aggregate. Method of virtual fatigue test was established that comprised the discrete element model of asphalt mixture, contact model of discrete element and fatigue criterion of mixture. The influence of distribution characteristics of aggregate on fatigue performance of asphalt mixture was studied by the virtual fatigue test. The results show that the fatigue life of asphalt mixture can be forecast by two-dimensional virtual beam fatigue test based on discrete element. Virtual beam fatigue test could be used as an accessorial method for evaluation of mixture fatigue performance. Homogeneity of aggregate has a great influence on fatigue performance of mixture. Fatigue failure usually happens in the area where there are dense coarse aggregates.

关 键 词： 沥青混合料 疲劳性能 虚拟疲劳试验 离散元 集料分布均匀性

领　　域： [建筑科学]