English：

In the construction of suspended waterproof curtain foundation excavation engineering, the pre⁃dewatering process is prone to the induction of the additional deformation of the retaining structure aroundthe foundation excavation and the unloading effect, such as ground settlement around the foundationexcavation, and even affects the construction safety and the stability of the surrounding environment.Based on the foundation excavation project of Hongqiao Station of Nanjing Subway Line 5, a three⁃dimensional finite element model considering the creep characteristics of soil was established based on thecombination of field monitoring data and numerical simulation. The additional deformation characteristicsof the retaining structure, the redistribution law of internal force, and the spatial distributioncharacteristics of the adjacent surface settlement caused by pre⁃dewatering under the condition ofsuspended waterproof curtain were revealed. The nonlinear influence of pre⁃dewatering depth on theunloading effect was summarized.