Abstract: The large foundation excavation will likely induce adverse effect on the operation of the adjacent rail transit, which is sensitive to the vibration and deformation. The design of the supporting structure for the foundation excavations near the rail transit should consider the site-specific environments. In this paper, a case history of the deep excavation near a rail transit line in Wenzhou is presented. The supporting for the proposed excavation area near the transit line was designed by using reinforced concrete rakers and earth berm support. Further, zoned excavation and temporary supporting system. Other effective methods, such as, reduce the time for the unsupported excavated area, ground improvement at the passive earth pressure zone at the bottom of excavation and minimize the soil erosion, could also considered. The paper also presents a numerical study results of foundation excavation effect on the transit bridge abutment of Line S1 and other adjacent train station structures. 

Key words: Large Deep Excavation, Rail Transit, Earth Berm Support, Ground Improvement, Bridge Abutment