Abstract
An effective reinforcement method for the side wall of a cut and cover tunnel has not been established yet. The behavior of cut and cover tunnel is strongly controlled by the deformation of the soil surrounding the tunnel. It is said that, therefore, the best way to improve the seismic performance of the tunnel is to cut the action transmitted from the ground to the tunnel. A new concept for seismic countermeasure of the cut and cover tunnel is developed. Thin walls made by a polymer material, whose stiffness are extremely small, are constructed at both sides of the tunnel. This thin wall, which is called “the isolation wall”, reduce the action transmitted fromthe ground and make the deformation of tunnel small. In this study, the efficiency of the newlydeveloped method is demonstrated through the analytical simulation, especially from the viewpoint of SSI (Kinematic interaction and Inertial interaction).
