Study on Seismic Dynamic Response and Failure Mode of Metro Station Affected by Burial Depths

Abstract

The metro station structure shows different failure modes when it is located at different burial depths. This re-search work is aimed to determine the influence laws of burial depths on dynamic response and failure modes of the metro station under near and far field earthquakes based on the nonlinear elastic-plastic finite element model of the metro station. The research results show that the horizontal displacements and acceleration dy-namic magnification factors of the metro station decrease and especially the internal forces increase gradually when the burial depth increases. The decreasing amplitude of the horizontal displacements and acceleration dynamic magnification factors of the metro station is reduced and the increasing amplitude of the internal forces slows down when the burial depth increases to a specific extent. Therefore, desirable anti-seismic per-formance could be achieved when a specific range of burial depth is avoided reasonably. At last, indoor shak-ing table test for metro station was done, through which we determined the initial failure position and the failure mode of the metro station under earthquake. And shaking table test results demonstrate the validation of the numerical simulation results.