Abstract: Based on the Yinzhong Road South Station project of Suzhou Transit Rail Line No. 7, the Midas GTS NX software was used to simulate the dewatering process of a deep excavation. Combined with the construction monitoring data, the influence of seepage on the deep excavation and its surrounding environment was analyzed. The results show that the horizontal displacement of the deep wall and the surface settlement outside the excavation are close to the measured values. The influence zone of surface settlement outside the excavation is large. The surface settlement outside the excavated area is distributed in a spoon-shaped curve, and its variation amplitude increases with the increase of excavation depth. The effect of seepage on the pore water pressure in permeable layer is significant. The seepage also has great influence on excavation supporting structure and surrounding environment. In the design and construction phase, the influence of seepage should be considered. The numerical simulation results considering seepage can provide reference for the design and optimization of excavation support and dewatering.

Key words: Deep Excavation, Excavation Support, Excavation Dewatering, Numerical Simulation, Seepage Simulation