针对路面颗粒材料因离析造成路面破坏的问题，根据路面颗粒材料离析过程设计离析试验，选择四元矿质混合料为研究对象，建立其粒径连续分布模型，取得表征材料级配的参数，以此分析颗粒材料的离析性．研究结果表明，采用粒径分散系数差可以评价颗粒材料的离析程度，而且据此可以便捷评估离析的颗粒材料是否仍然可用于路面铺筑；此外，伴随颗粒材料平均粒径和粒径分散系数的增大，颗粒材料的离析程度有明显增大的趋势．此离析性评价方法也可用于分析沥青混合料的离析

In order to escape the pavement destruction caused by the segregation of granular pavement materials, a segregation test was designed according to the segregation process, and a kind of four-element mineral mixture was chosen as the research object to construct a continuous diameter distribution model. Afterwards, the segregability of granular materials was obtained according to the parameters describing the material segregation. The results show that, according to the segregation degree of granular materials evaluated by the difference in diameter dispersion co- efficient, it is convenient to assess the fitness of segregated materials for pavement, and that the segregation degree of granular materials obviously increases with the average diameter and the diameter dispersion coefficient. The proposed evaluation method can also be used to analyze the segregation of asphalt mixture.