English：

To investigate the impact of subway shield tunnel excavation on adjacent viaduct pilefoundations, relying on the double⁃line shield tunnel project of a certain city’s subway line 5, numericalsimulation was employed to analyze soil displacement, bridge pile displacement, and force on bridge pilesunder tunnel excavation. A comparative analysis was conducted between simulated and measured valuesof bridge pile settlement. The research results indicate that as the depth of bridge piles increases, thesettlement of each pile at the bridge pier first decreases and then stabilizes,while the horizontaldeformation of each pile at the bridge pier generally increases first, then decreases, and finally increasesagain. With the increase in the depth of bridge piles, the bending moment of each pile at the bridge pierfirst increases, then decreases, and then increases again. At different depths of bridge piles, thedifference between measured and simulated values of bridge pile settlement is relatively small, suggestingthat the simulated values are basically consistent with the measured values. During actual tunnelexcavation, it is recommended to perform grouting reinforcement on the strata surrounding the bridge pilefoundations,while also reinforcing the lower strata of the viaduct, in order to reduce the settlement of thebridge pier pile foundations.