Numerical Simulation Analysis and Monitoring of Ground Surface Subsidence in Shallow Tunnels by Excavation

摘要

Based on the case of the underground passage beneath Changchun railway station, the surface subsidence caused by tunneling beneath the railway is studied in this paper. A 2d finite element model was established to simulate the tunnel construction process. During the extremely shallow tunnel construction, the maximum subsidence value and its rules were obtained by loading with conventional quasi-static train loads. Train loads' position where cause the worst surface subsidence, ground maximum value, and its distribution were obtained by moving the train load's position. Firstly, in the construction process a suitably strict control and monitoring system is designed to detect the surface subsidence. Then the collected data from the monitoring system is analyzed and fed back, and the construction is dynamically managed. Finally the construction work is ensured to keep on going smoothly and safely.