Abstract: The prediction of the loads and their time effects on the lining system of a shielded metro tunnel crossing the existing tunnels is an important factor in the risk control of the shield construction.  This paper records a case history of the proposed No. 3 shielded regional metro line underneath the existing No. 1 metro line in Nanjing City. The finite difference method was used in the analysis the impact of the No. 3 line construction on the lining system of the existing No. 1 line. The results indicated that the current shield construction technology was appropriate and would not adversely affect the existing tunnel lining.

Key words: Shielding Crossing, Mining Method Tunnel, StressStrain Characteristics, Time Effect, Numerical Simulation