<p>This paper focuses on the construction segment of the subway tunnel and connecting passage for the Zhenguan Road to City Library Station section of Xi’an Metro Line 8. A model test system is specifically designed to simulate the formation of a two-lane tunnel with an interconnecting channel, considering the fluid-structure interaction. The study investigates the patterns of ground settlement and surrounding rock stress in such a double-lane tunnel with a interconnecting channel, under the influence of dynamic water level fluctuations. Additionally, comprehensive monitoring is conducted over a two-month period on the ground settlement, lining structure clearance convergence, and vertical displacement of the subway tunnel’s connecting passage within Xi’an Metro Line 8. To validate the displacement and ground settlement of the lining structure and the tunnel’s connecting channel structure during periods of falling water levels, the results indicate a close correlation between the displacement patterns calculated through numerical simulations and the observed data.</p>