根据湘西北地区各种类型细粒土室内CBR2.5mm试验成果进行统计分析,得出该地区细粒土CBR2.5mm试验值呈对数正态分布,为该地区高速公路路基填土的选取提供参考。 Based on the statistical analysis of CBR2.5mm test results of various types of fine grained soil in northwestern Hunan, it is concluded that the CBR2.5mm test value of the fine grained soil in this area shows a lognormal distribution, which provides the basis for the selection of expressway subgrade fillings in this area reference.