Abstract：Shield-driven tunnels of the Pearl Line 2 were constructed adjacent to the Metro Line 2 tunnels near Dongfang Road Station in Shanghai. A minimum distance of 12.3 m between the centerlines separates the new and existing tunnels from each other. In view of the scale and distance of construction，significant influence on Metro Line 2 tunnels is expected. The paper presents the monitoring of the tunnel deformations during the process of construction. Automatic monitoring system of electric level bar was installed in the Metro Line 2 tunnel to monitor their displacements and to ensure the safety of running Metro Line 2. It describes the characteristics of influence from the thrust of a succeeding tunnel to a preceding tunnel and gives some advices about the planning and construction of the tunnel adjacent to the existing tunnels. FEM analysis is applied to provide comparison with the measured data.
