Practiceand Analysis of Deep Foundation Pit in Soft Soil Area and Complex Environment

Taking a soft soil foundation pit project in a complex environment in Wuhan as an example, the key points, difficulties and countermeasures of the deep soft soil foundation pit design is introduced. The project is close to residential areas, municipal roads and viaducts. There is about 8～10 m deep soft soil on the side wall and base of the foundation pit. Through the scheme comparison, the support mode of cast-in-place pile + two-layer reinforced concrete internal support + triaxial mixing pile water stop is finally adopted. For one side of the viaduct with strict deformation requirements, targeted protection measures of adding passive area reinforcement are adopted to reduce the impact of foundation pit excavation. The monitoring data of the whole excavation process of the foundation pit show that the deformation of the reinforcement side of the passive area is about 27.2% less than that of other parts, which verifies the rationality of the support scheme and protection measures, and has reference significance for similar projects.