Monitoring Analysis and Research of a Foundation Pit Engineering in Soft Soil Area

Abstract

A deep foundation pit project in soft soil area has deep depth, complex surrounding environment and close proximity to subway, so it is necessary to monitor the supporting structure and surrounding environment of the foundation pit during the construction of the deep foundation pit. According to the characteristics of the foundation pit, a reasonable monitoring scheme is formulated to monitor the deep horizontal displacement of the foundation pit, the horizontal displacement of the top of the retaining structure, the vertical displacement of the upright post and the underground water level outside the pit, and the monitoring results are analyzed. The monitoring results show that the deformation of the retaining structure and the vertical displacement of the upright post of the foundation pit gradually increase with the excavation unloading process of the foundation pit soil, and the supporting effect will restrain this deformation. After the foundation pit floor construction is completed, the deformation gradually tends to be stable. The monitoring results provide a reliable guarantee for the safety of the project during foundation pit construction, and can provide reference and basis for similar projects.