Design and Evaluation of Internal Support and Anchor Support in Complex Environment for Deep Foundation Pit

By taking an ultra-deep foundation pit project in the central area of Beijing as an example, according to the different surrounding environment of the foundation pit, the supporting systems of diaphragm wall+ reinforced concrete internal support and diaphragm wall + upper prestressed anchor and lower reinforced concrete internal support were respectively adopted in this project. It effectively controls the deformation of the foundation pit itself and surrounding buildings, and ensures the safety and stability of the foundation pit supporting system and surrounding buildings. At the same time, if the surrounding space conditions match, the upper prestressed anchor could be used to replace partial internal support. It can save the construction period and reduce the cost, and has reference value for similar projects.