Abstract: A deep excavation project in Shanghai near the Huangpu River is adjacent to a flood control wall, the Su gate pier and other important flood control facilities. This project is also close to two other well-known historical buildings. Since the surrounding environmental conditions are extremely sensitive, the deep excavation deformation control requirements are extremely high. The project site engineering geological conditions are complex, and the soil of the adjacent river stratum is poor and permeable. There are also many design and construction difficulties such as underground obstructions. To solve the above-mentioned hazards, an overall zoning and staging option with a combination of bottom-up and top-down construction method was adopted for the deep excavation, and the support structure measures were strengthened for the key sensitive object protection links, to integrate the environmental protection requirements, the construction schedule and the engineering geological conditions. The measured data demonstrate that the surrounding protection objects such as the Huangpu River flood control facilities and historical buildings adjacent to the excavations are in a safe and controllable state during the excavation construction. The series of design measures implemented ensure the safety of the surrounding environment and achieve the expected effect.

Key words: Flood Control Facilities, Historic Buildings, Top-Down and Bottom-Up Combinations