Abstract:

Many factors influencing the mechanical state of foundation pit are interrelated, and the control of mechanical state of foundation pit has not formed a systematic system, which cannot give full play to the effect of various control measures. Hence, the foundation pit engineering is studied as a system, four characteristics of the foundation pit construction control are put forward based on the basic concept of system engineering and control theory, the concept and contents of the construction control of foundation pit are presented, and the deep foundation pit construction control is discussed from the aspects of deformation of retaining structure control, retaining structure strength control, support safety control, foundation pit stability control and the surrounding environment control. And then the technical control and management control methods of the lateral deformation of retaining structure are constructed for the control subsystem of the lateral deformation of retaining structure, and the combination of different control methods is applied to form a complete control system of the lateral deformation of the foundation pit retaining structure. Finally, an example of Pudong South Road metro station in Shanghai is given to verify its practicability. The results show that the control of lateral deformation of retaining structure by systematic thinking can give full play to the effect of various measures.

Key words: soft soil, metro station, deep foundation pit, construction control, lateral deformation