作　　者： ; ;

机构地区： 东南大学交通学院

出　　处： 《Journal of Southeast University(English Edition)》 2009年第4期518-522,共5页

摘　　要： In order to study fracture behaviors of asphalt mixtures, virtual tests of the two-dimensional（2D） microstructure based on the discrete element method（ DEM） are designed. The virtual structure of the 2D digital specimen of asphalt mixture is generated based on a particle generation program, in which the gradation and the irregular shapes of aggregates are considered. With the 2D digital specimens, a DEM-based mixture model is established and center-point beam fracture simulation tests are conducted by the DEM. Meanwhile, a series of calibration tests are carried out in laboratory to evaluate the DEM model and validate the methods of virtual fracture tests. The test results indicate that the fracture intensity of asphalt mixtures predicted by the DEM matches very well with the intensity obtained in laboratory. It is concluded that the microstructural virtual tests can be used as a supplemental tool to evaluate fracture properties of asphalt mixtures. 为了深入研究沥青混合料开裂特性,设计了基于沥青混合料二维数字试件的断裂虚拟试验.在考虑混合料二维截面的集料数量级配和集料不规则形状的基础上,通过生成程序建立了沥青混合料的二维虚拟试件;运用离散元方法,建立了混合料二维离散元模型,并进行了虚拟的中点弯曲小梁断裂试验;为了验证虚拟试验方法的正确性,在实验室内进行了沥青混合料小梁的中点弯曲断裂试验.室内实体试验与虚拟试验结果的比较发现,虚拟断裂试验获得的混合料断裂强度与室内试验结果一致,表明虚拟断裂试验可以作为混合料断裂性能分析的辅助手段.

领　　域： [交通运输工程]