This research carries out model tests to investigate the dynamic behavior of multi-section cut-and-cover subway tunnels in transvers direction by seismic motion, which has not been fully investigated. A multi-section model tunnel as well as a general single box type one is installed in a soil vessel and it is found that the sectional force corresponds to those obtained by tunnel design. Then, the L2 earthquake motion (Spectrum II) based on design standard for railway structures is applied to the soil vessel. The results show that the bending moment and shear force are comparatively large in the center wall, the tendency is different among the loading direction. Moreover, the results of 3D dynamic finite element analysis for evaluation of model tests shows approximately the same situation and this research gives various findings to establish the seismic analysis method of multi-section cut-and-cover subway tunnels.

 Large magnitude of settlement and many cracks were observed in a part of the longitudinal direction of the existing cut and cover subway tunnel in soft ground. It is important to evaluate accurately the load bearing performance of the subway tunnel for the long term safe service. It was found from the in-situ measurement results of the reinforcing bar strain values that the position of neutral axis on the tunnel cross-section is different from the position obtained from a conventional calculation. An apparent axial force acting along the tunnel longitudinal direction is assumed to be generated due to the effect that the tunnel extension movement with the cracks induced in the tunnel lining is constrained by both end parts of the tunnel without the deformation and is approximately estimated. It was found from the numerical calculation results that the tunnel damages such as a distribution of cracks in the tunnel lining can be reproduced accurately by using the apparent axial force and a quasi-three-dimensional model.