Abstract: A proposed underground connection tunnel is to be constructed within the safety protection zone of Yanxia Bridge in Wuhan City to improve the local business and integrate resources. To ensure the progress of the underground connection tunnel renovation project and the safety of Yanxia Bridge, the project potential risks are first identified based on the exploration data. Then, the current condition of the bridge structure is evaluated. The current structural characteristics are collected through research and on-site investigation to determine the structural safety control index values. Numerical analysis is conducted using the geotechnical finite element software 3D MIDAS/GTS to select effective structural deformation control indicators. The research results show that the single-pier settlement, pile foundation horizontal displacement, and bridge pier inclination caused by the project construction are all within the deformation control standards and basically do not affect the safe operation of Yanxia Bridge. To ensure safety during the project implementation, it is necessary to strengthen special monitoring, formulate emergency plans and special construction plans.

Key words: Underground Connection Tunnel, Yanxia Bridge, Safety, Control Indicators, Deformation Analysis