Abstract
This paper elaborate the bad geological characteristic and the huge disaster caused by expansive soil. When constructing the road or railway in expansive soil area, the roadbed disease such as slope stability failure,roadbed settlement,mud pumping,ballast bag and so on is elaborated. The expansion and shrinkage mechanism of expansive soil has been studied from such aspects as physical-chemistry-mechanics effect, material composition, external influencing factors and so on. In expansive soil area, such expansive soil treatment and reinforcement methods as physical improvement, chemistry improvement, biological improvement are summarized and proposed.
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