Abstract: The shield tunnel construction will cause a certain disturbance to the surrounding environment. The surrounding soil and rock mass deformation and ground subsidence exceeding certain limits will threaten the main structure of the tunnel and even affect the safety of the surrounding environment. Therefore, the ground subsidence is one of the necessary items to be measured in the shielded tunnel excavation, and the prediction of the ground subsidence is also the focus of the project. In the study of the ground subsidence caused during the shielded tunnel excavation, the Peck’s formula is a more widely used model. However, the Peck’s formula has some limitations and errors can occur in engineering applications. Therefore, based on the construction monitoring data of the shielded tunnel of Xiong’an Metro Line No. 1, the Peck formula is combined with the linear regression equation. The two correction coefficients, the settlement trough width coefficient K and the stratigraphic loss rate η, are introduced to the Peck formula. The Peck equation is modified so that it is more applicable to the geological conditions of the Xiongan area.

Key words: Shield Tunnel, Ground Subsidence, Modified Peck’s Formula