Abstract: With the increasing commercial estate opportunity along the subway lines, large size deep excavations are frequently encountered adjacent to the metro tunnel alignments. The excavation induced unloading at these large sized deep excavation projects might result in the deformation of the adjacent tunnels. If the excessive deformation occurs in the tunnel structures, the safe operation of the metro cars might be compromised. This paper presents a deep excavation history in Nanchang City. The influence of the deep excavation on the adjacent metro tunnel structures are investigated with three different analytical methods.

Key words: Excavation Induced Unloading, Safe Operation of Metro Cars, Structural Deformation in Tunnels, Impact Analysis