It has become a common understanding that frost action is a kind of weathering process, which considerably changes engineering properties of soils due to cryogenical actions.
冻融过程中土结构受冷生作用的影响，可导致土的工程性质发生变化。
Cracks in unsaturated expansive soils influence the engineering properties of soils. The purpose of this paper is to research the tensile crack propagation depth of unsaturated expansive soils.
膨胀土的裂隙性是膨胀土区别于其他土类的重要特征之一，裂隙的存在严重影响着膨胀土体的工程特性。
Based on special engineering properties of expansion soils, influence factors of swell-shrink distortion are analyzed.
针对膨胀土特殊工程性质，分析了胀缩变形量的影响因素。
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