中文摘要：

近十几年来国内外学者对非饱和土在干湿循环作用下的特性进行了大量的试验研究,为了梳理国内外研究思路及成果,对目前有关非饱和土干湿循环的试验研究成果进行了归纳,分别从土-水特征曲线、强度、变形、渗透性以及干湿循环对改良土和边坡、路基的影响等多个方面阐述了当前的研究现状。最后分析了试验方法和标准不统一等当前研究中存在的问题,并对今后的研究进行了展望。

英文摘要：

In the last decades,international scholars have made a lot of progresses on the impacts of wet-dry cycling on the properties of unsaturated soil. In order to sort through the ideas and results of these researches,the results of the international experimental study on the wet-dry cycling of unsaturated soils are summarized. The current research status is expounded from the aspects of soil-water characteristic curve（ SWCC）,shear strength,deformation,penetrability and the influence of wet-dry cycling on the improved soil,slope and embankment. Besides,this paper analyzes the problems existing in the current study,such as the variance of the testing methods and standards. Finally,future research directions have been proposed.