Abstract: Based on the project of Shanghai Arc de Triomphe, the basic theory and the key construction technology of the deep excavation is introduced. Combining the theoretical analysis and field monitoring, the key technologies of the deep excavation dewatering, bracing system and foundation excavation are presented respectively. The supporting system of the concrete bracing and the steel bracing is used to support the foundation excavations, to reasonably control the earth excavation construction, so as to support with excavation, the critical embedment depth of the soldier pile is determined from the horizontal displacement of the pile and ensure the stability and safety in the process of foundation excavation and construction. The vertical settlement and the horizontal displacement of soldier pile and soil are monitored, and the monitoring data are compared with the standard early warning value to ensure the safety of foundation construction. Through the systematic research, it provides references for the design and construction of similar deep foundation pit engineering.

Key words: Deep Foundation, Key Construction Technology, Monitoring and Measurement