Abstract: Engineering measures for existing tunnel under crossed by shield tunnel in short distance were put forward through the analysis of project example in the Wuhan Metro line 2 under crossed by Metro line 3, combined with the engineering experience of similar geological strata. Numerical analysis methods were used to obtain the relations between the vertical displacement of existing tunnel and the jacking force of shield machine, ground strengthening and position of the shield machine. Feasibility of the engineering measures was verified and related suggestions were put forward.

Key words: Shielding,Under Crossing in Short Distance, Existing Tunnel;Numerical Analysis