Study on the influence of expansive soil slope on bridge foundation under excavation and rainfall conditions

Expansive soil is a kind of special that mainly composes hydrophilic minerals and has significant deformation characteristics water absorption expansion loss shrinkage. The often bring great harms to engineering construction. Relying on the bridge foundation expansive slope Yangtze-to-Huaihe Water Diversion Project, this study simulates humidity field with temperature for using numerical simulation method when short-term or long-term rainfall occurs during excavation. horizontal considering four factors such as self-weight soil, excavation unloading rebound, hygroscopic decrease strength caused by change content was studied herein. research results show process, produces displacement towards top slope, after introduces gradually develops in opposite direction. During rebound main factor affecting foundation. Under conditions, becomes influencing factor. are soil's strength.