Abstract: The assessment accuracy on the frost heave of expansive soil not only affects the normal operation of project, but also is an important guarantee for project safety. In this paper, the evaluation method of frost heave of expansive soil is studied. Fuzzy analytic hierarchy process (AHP) is used to establish the evaluation model. Five assessment factors, such as particle grading index, physical property index, expansive index, frost heave index and et al., are selected and evaluated quantitatively. The evaluation results are in agreement with facts. It is proved that the fuzzy AHP is feasible and accurate for evaluating frost heave of expansive soil.

Key words: AHP and fuzzy evaluation theory, expansive soil, frost heave

摘要： 膨胀土冻胀性评价的准确性不仅影响着工程能否正常运行，也是工程安全性的重要保证。文章对膨胀土的冻胀性评价方法进行研究，采用模糊层次分析法建立膨胀土的冻胀性评价模型，从颗粒级配指标、物理性质指标、膨胀性指标、冻胀性指标等方面，选取5个评价因子，进行定量评价，评价结果与实际吻合，证实模糊层次分析法用于膨胀土的冻胀性评价是可行的、准确的。

关键词: 模糊层次分析法, 膨胀土, 冻胀性评价