Abstract: The simplified stochastic medium theory and the settlement empirical formula were used to estimate the ground settlement in the deep excavation of Nahong Overpass Station of Nanning Rail Transit Project. The feasibility and accuracy of prediction ground subsidence are validated by the monitored data. The settlement of surrounding buildings causing by the deep excavation and the relationships among the building settlement, the ground deformation and the horizontal displacement of supporting structure of the deep excavation were analyzed. The results indicate that the predicted value by the stochastic medium theory is consistent with the characteristics of the monitored data, but the monitored value is less than the predicted value. The settlement characteristics of the building are consistent with the surrounding ground deformation, but it is relatively lagging with time. Both the deep excavation and the internal support construction will lead to deforming of the surrounding environment, causing fluctuations in the cumulative settlement of the surrounding ground and buildings.

Key words: deep excavation, stochastic medium theory, field monitoring, buildings, settlement