Abstract:The shield working shaft of Shanghai Beiheng Channel Screen Factory and the foundation pit of the adjacent buried section are located in a typical soft soil stratum. The depth of the foundation pit is 32.5 meters. There is a five-story commercial building at 6.7 meters from the pit edge. The excavation and reconstruction of the foundation pit must ensure the structural safety of the building. Taking the foundation pit as an example, and aiming at the physical condition, protection requirements, geological condition and surroundings of the building, the targeted measures are taken to reduce the impact of foundation pit excavation on the adjacent buildings. The design scheme of the foundation pit is introduced, and the validity of the scheme is verified by comparing the monitoring results of the foundation pit. The influence law of ultra-deep foundation pit excavation on the surrounding soil and the adjacent buildings and structures is studied. The effective measures to increase the safety of the buildings and structures beside the pit are put forward including the reinforcement of the soil inside and outside the pit, the addition of temporary steel supports, etc. The conclusions can be referred for the similar projects.
