Along with the large-scale construction of highway and fast development of the western part of China, it is important to study on the roadbed and slope problems in the districts of the expansive soil.

我国是膨胀土分布最广泛的国家之一，随着我国高等级公路的大量兴建和西部开发步伐的加快，开展膨胀土地区公路路基和边坡问题的研究，具有重要的现实意义。

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