Abstract:In order to ensure the safety of constructions and operation , settlement and deformation is very strictly required for the subway engineering. The impact of foundation pit excavation must be taken into consideration when a urban tunnel passes through the subway elevated section, and then the corresponding monitoring and protection measures should be formulated. Taking Tsingtao WindRiver Expressway project in which theSSurbanStunnel passes under the viaduct of Tsingtao Metro Line 13 as an example, this paper analyzes the influence of excavation on the viaduct structure, which provides a useful reference for similar projects under the geological conditions in Tsingtao area.