Abstract：Stratigraphic inhomogeneity and special strata have the significant impact on long-term differential settlement under the train vibration loads, which even directly affect long-term safety in the process of train operation. Considering the Foshan Metro Line 2 as an example, the structure stress and the stratum settlement are analyzed in detail through numerical simulation methods before and after strengthening. The study results indicate that the metro train vibration load has less influence on structure and the overall stratum. The tunnel has a long-term settlement under the long-term train vibration load circularly. The settlement value develops rapidly in early stages but turns slowly in later stages, which is reduced significantly after the grouting reinforcement of liquefiable stratum.
