Expansive soil is a special field in modern engineering geology and soil mechanics, it is a special field kind of clay, different from loess, laterite, soft soil, frozen soil and common clay.

• 膨胀土是现代工程地质学和土力学中一个特殊的领域,它是有别于黄土、红土、软土、冻土以及普通粘土的一类特殊粘性土。