中文摘要：

应用粗集理论对《公路工程地质勘探规程》（ JTG C20-2011）建议的膨账土判别与分级标准进行分析,其中自由膨 账率和标准吸湿含水率的权重分别为0.628和 0.372,塑性指数对分级结果无影响.建议按权重利用自由膨账率和标准吸 湿含水率两个指标对膨账土进行分级：且建立膨账土的分级标准和分级模型,通过对皖中地区膨账土进行分级,验证结果 表明：建立的膨账土分级模型分级准确性较高,取得了较好工程实际效果.

英文摘要：

Using rough set theory to analyze the criterion of judging and classification of expansive soil in highway engineering geological exploration （C20-2011 JTG） , the weight of free expansion rate and moisture content of standard moisture content is 0.628 and 0.372 respectively. Suggestions according to the weight using free expansion ratio and the standard moisture absorption water content of two indexes of expansive soil classification; and establishment of expansive soil classification standard and classification model, through the classification of expansive soil in the middle area of Anhui Province. The test results show that the establishment of expansive soil classification model classification accuracy higher, achieved good practical effect.