Abstract: With the increasingly complex development environment of the urban underground space, the impact of the deep excavation project near the subway on the operation of the tunnel has also attracted much attention. Based on a deep excavation project near a subway in Shanghai, the measured data of the tunnel deformation are evaluated during the construction process. The influence of the upper building on the tunnel deformation is analyzed by the numerical simulation method, and the subsequent construction is also predicted and analyzed. The research shows that when the excavation depth of the foundation is less than the tunnel waist embedment depth, the “horizontal laid duck egg” deformation trend is inclined upward near the tunnel. Due to the thixotropy of the soft soil, the influence of the buildings above the tunnel on the tunnel deformation during the deep excavation construction cannot be ignored. During the process, the impact of followup construction is tracked and predicted, and the lateral microdisturbance grouting method is timely adopted at key nodes to effectively control the deformation of the tunnel. This study provides reference for similar engineering cases.

Key words: Complex Environment, Operational Tunnel, Deep Excavation Construction, Deformation Control