Seismic Response and Damage Mechanism of the Subway Station in Rock and Soil Strata

Abstract

Numerical simulations are carried out to study the seismic response of a subway station in rock and soil strata. In addition, during the numerical simulation, Drucker-Prager yield criterion and the constitutive model for concrete are introduced to be able to adequately describe the yield failure of surrounding rock and damage behavior of concrete. Based on the numerical results, the time histories of principal stresses, distribution of principal stresses at particular moments, the plastic deformation of surrounding ground and the damage of structure are fully studied. According to results and discussion, it can be concluded that the largest tensile stress generally occurs at corners including the spandrel, top of sidewall and the bottom of the sidewall. In addition, large shearing deformation is observed at the interface of rock and soil layer, due to the incongruous deformation. Structure damage is mainly observed at corner area in symmetrical distribution.