Abstract: To investigate the deformation and failure issues caused by the construction of a new double-line shield tunnel crossing adjacent to existing underground structures, a case study of a double-line shield tunnel beneath an existing station in Zhengzhou′s metro system was conducted. A three-dimensional numerical model was established using midas GTS to examine the construction process of the double-line shield tunnel crossing the existing station. The study found that the vertical settlement curve of the station′s base slab transitioned from a "V" shape to a "W" shape as the shield construction progressed, with the affected zone expanding from three times the tunnel diameter to five times the tunnel diameter. The deformation curve of the base slab induced by the construction matched the Peck curve. The vertical and horizontal deformations of the support structures near the tunnel excavation exhibited an overall increasing trend; however, all deformations remained within the safety control standard limits. The numerical simulation results indicated that no additional reinforcement measures are required during the shield construction period. Nevertheless, monitoring efforts should be focused on a 16 meter area to the left and right of the X direction of the existing station′s base slab, as well as at the C entrance/exit.