ABSTRACT
Tokyo Metro Co. Ltd. operates 9 routes in the capital area of Japan; total length of tunnels is 166km. In Japan, subway tunnels were constructed by the cut & cover method and have horizontally oriented double cell box tunnels with rectangular cross sections. Because some tunnels had to be built under narrow roads in Tokyo, there exist some vertically oriented double cell box tunnels due to land acquisition problems. And there exist some parts with special cross sections changing gradually from the vertical or horizontal direction to the other direction, hereinafter called “tunnel sections with non-uniform heights”. The Earthquake Resistance Standard for Railway Structures in Japan (Railway Technical Research Institute. 2012 [3]) contains no explanation of the complicated structure such as the tunnel sections with non-uniform heights. To explain the earthquake resisting of the complicated structure, it is important to analyse behaviour of the ground and structure such as the complicated shape, and grasp the sectional force of the structure associated with the ground movement at the time of the earthquake. For this reason, the model ground and a model tunnel were made and shaking table tests using a shear soil vessel were carried out to simulate the ground movement situation and the tunnel behavior at the time of earthquake. And the reproduction analysis of the tests were carried out by FEM and to confirm validity of the analytical technique. In result, deformation behavior and sectional force of the tunnel sections with non-uniform heights associated with the ground movement at the time of the earthquake were made clear, and knowledge of the examination method of tunnel sections with non-uniform heights were obtained.
