Abstract: The postconstruction surface subsidence of subway tunnels is an important safety hazard, which will seriously affect the safety of subway tunnels and neighboring buildings if it is not properly controlled. Therefore, an in-depth study of the law of post-work surface subsidence in subway tunnels is a necessary prerequisite for taking effective control measures. In this study, the regularity of the post-work surface subsidence of subway tunnels is explored by analyzing the on-site monitoring data in the Guiyang subway Line No. 3 interval tunnel as an example. A mathematical model was used to predict the post-work surface subsidence of the Guiyang subway tunnel, and a comparative analysis of the prediction effect was carried out. The results show that the exponential function model and the logarithmic function model perform well in fitting the measured data, but for the post-work surface subsidence of the tunnel in this zone, the exponential function model has a higher prediction accuracy in the middle and late stages, showing better applicability.

Key words: Post-Construction Surface Subsidence, Mathematical Model, Settlement Prediction