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