Abstract
In this paper, the optimal design of tunnel lining is considered from the mechanical point of view and an optimal design method is proposed. The object of the optimal design method is minimizing the cost of tunnel lining under the conditionthat the tunnel will not collapse plastically due to the external forces. To show the effectiveness of this proposed optimization method, we solve three types of tunnel examples; circular tunnel, horseshoe-shaped tunnel, and rectangular-shaped tunnel.
