Abstract: Combined with a deep excavation project in Suzhou, the monitoring results of the horizontal and vertical displacement at the top of pile (slope), groundwater level and surface outside the excavated area with different supporting structures in the process of the deep excavation construction are collected and the monitoring data are systematically analyzed. The results show that with the excavation progress, the horizontal displacement of pile (slope) top of different retaining structures gradually shifts to the inside of excavated area. The cumulative absolute value of the vertical displacement of pile (slope) top increases gradually, and the change trend of time history curve of the vertical displacement of pile (slope) top at each measuring point is essentially the same. The soil around the excavated area has settlement, but the cumulative value of the surface settlement outside the pit is not large and is within the allowable value. Therefore, the support form of the SMW method pile, bored pile combined with triaxial mixing pile and twostage slope combined with mixing pile is effective. Finally, the numerical analysis of the deep excavation supporting structure is performed by using the ABAQUS finite element software. The results show that the variation relationship of the numerical simulation and monitoring results is consistent, indicating that the design of the deep excavation supporting structure is reasonable.

Key words: Monitoring, Deep Excavation Support System Deformation, Enclosure Structure, Numerical Simulation