Abstract
Ningbo is located in the southeast coast plain. There are thick, soft soil deposits lying in the sub-ground, which challenges the construction of urban rail transit in this area. A project of Ningbo Rail Transit Line 1 and the soil conditions for the construction site are firstly presented. Then, the excavation engineering designs for the project are summarized from four aspects: the design of building envelope, vertical and horizontal layout of supporting system, underground water dewatering and ground treatment. Simultaneously, the problems occurred in the design are also described. Lastly, the experiences gained from the project are summed up, so as to guide the further subway construction in the area and also provide a reference for the construction of similar project.
