Abstract: A deep excavation project in Wuhan is in the key prevention and control area of deep and thick and soft soil area. The depth of the proposed excavation is large. The artisan water with high head exists in the deep sand layer and the aquifer has been exposed. At the same time, the project is in the main urban area of Wuhan. The construction site is narrow, and the adjacent environment is complicated. The deformation of the deep excavation is sensitive, and the requirements of the environmental protection are restrictive. By adopting the safe and effective design of supporting, dewatering and strictive quality assurance measures, the seepage failure can be avoided, and the deformation of the supporting system can be well controlled. The adverse effects on the adjacent environment can be avoided. Based on the characteristics of the project, the circular type of the internal supporting system with a reasonable force performance is adopted to release more space and improve the construction efficiency. The entire process of the deep excavation monitoring provides information support for a safe deep excavation.

Key words: Deep Excavation, Soft Soil Area, Seepage Failure, Complicated Environment