Mechanical and Security Evaluation of the Existing Metro Station Structure under Construction of Through Tunnel of New Metro Line

This paper introduces security evaluation when a tunnel of a New Metro Line goes through an existing Metro station structure.Stratum displacement caused by neco-line tunnel construction should be controlled strictly so as to keep the normal operation of the existing Metro line and guarantee the security of the existing station structure.This paper forecasts the settlement curve of the existing station structure and evaluates the influence of the excavated tunnel.The control target of settlement according to the requirements of train operation safety and in view of comprehensive influencing factors.The finite-element model is established to calculate and analyze the stressed features and security conditions of the existing Metro station structure under through tunnel construction.This provides references for adopting reasonable assistant measures in construction.