On Excavation Construction Technique of Soft Soil Foundation Pit with Super Deep Foundation "Pit-in-pit"

Through a case of foundation pit, the excavation construction technique of complex soft soil foundation pit with super deep foundation pit-in-pit was introduced in the paper. According to its features, the sequence, method and principle of excavation were mentioned firstly. Then, the process flow, the mechanical selection were put forward. Finally, the key points and experience and lessons of the excavation construction were summarized by the authors.