The destruction of the form of the typical compaction red day and expanxive soils usedpas filler. The basic properties and shinking and swelling characteristics during the alternative drying and wetting processes of red clay which comes from Jian and expansive soil which comes from Gaochun are discussed. The similarities and differences in shrinking and swelling characteristics of the two kinds of special soils were compared. Red clay is dominated by contraction and expansive soil is dominated by expansion under wetting and drying cycles. The research on water stability of red clay and expansive soil is also made, the experimental results show that water stability of red clay is significantly better than that of expansive soil. The differences between the two kind of soils are researched to make better use of red clay as subgrade filling in red clay areas and it is possible to make the red clay engineering harm to the minimum.%调查了典型击实红黏土及膨胀土用作路基填料时的破坏形式.比较了红黏土及膨胀土在干湿循环条件下的胀缩变形特性的异同,得出干湿循环作用下,红黏土是以收缩为主,而膨胀土是以膨胀为主,这两类土呈现的不同变形趋势是导致它们产生不同路基病害的原因同时进行了红黏土和膨胀土的水稳性研究,得出红黏土的水稳性明显优于膨胀土.区别对待这两类土可以更好地利用特殊土作为路基填料,使特殊土的工程危害降到最低.
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