3D-FEM is applied to simulate the construction of parallel shield tunnels

and the laws of displacement

deformation and internal force of the old tunnel are analyzed along with the dynamic driving of the new one. In analyzing the interaction between shield machine and lining structure is taken into consideration in the model

as well as the transverse isotropy of lining structure. The results show that in the existent tunnel longitudinal nonuniform settlement and lateral displacement appear around the shield machine

and traverse torsion occurs behind the shield machine. The construction of new tunnel will apply the “lateral loading” effects to the old one

decrease the moment and increase the axial force in the traverse section

and make the internal force state of left and right sides to be not symmetrical any more. The longitudinal force-bearing state of the existent tunnel experiences a process of first compression followed by tension

and the most unfavorable stress state appears in its side far away from the new one. The thrust force

grouting pressure

and stratum loss

which should be controlled strictly

have great effects on the old tunnel; and the counterforce of thrust has a minor effect comparatively. This work offers references for the construction of similar engineering.