Abstract: Deep excavation is a necessary project for the construction of large urban buildings, and slope support is the validation of the safety and stability of foundation excavation engineering. A deep excavation project is close to the highraised buildings, surrounded by traffic arteries and rivers, which is significantly affected by external loads. The excavated slope is supported by soldier piles + prestressed ground anchors or castinplace concrete soldier piles + concrete waler support. In the process of foundation excavation, the development of deformation is monitored, focusing on the horizontal and vertical displacement of the top of the support structure, slope displacement and surface settlement. Based on the monitoring results, it is concluded that the pile anchor support structure can play a good role in minimizing the excavation deformation in this environment, effectively slow down the slope deformation rate and control various deformation factors within a controllable range. The support method can provide a reference for future foundation engineering support in similar complex environment.

Key words: Complex Environment, Deep Excavation, Support, Monitor