Abstract
The shield tunneling methods by which only outer shell of a tunnel is excavated in advance have been spotlighted for large sectional tunnels. One of those is the ring shield method. The earth corresponding to the tunnel lining is removed by one machine at the same time. Segmental linings are assembled into the space created. Afterward inner core is excavated.
A series of loading tests of the segments applied to the technique has been carried out in order to establish the design method. In the paper, the test results are mentioned. The analytical model that simulates the results is proposed and its suitability is discussed.
