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In this paper, the results of evaluation on the member forces in the virtual subsea tunnel lining segments and optimal thickness of the segment with changes in depth were presented. To evaluate member forces on the hypothetical subsea tunnelling cases were developed and the segmental lining member forces were calculated by performing structural analysis using the 2-Ring Beam model. Through a preliminary reinforcement design review of the cross-section using calculated member force, optimal reinforcement design was selected. Based on the results, the variations of member forces with construction conditions such as the cover depth and the hydraulic pressure are presented. In addition, optimum segment lining designs were developed for various tunnelling conditions. Keywords: TBM tunnel, Segment lining, 2-Ring Beam-spring model, Member forces, Subsea tunnel  :                    .               2-Ring Beam      .                 .                 .: TBM , , 2   , , Copyright ⓒ2015, Korean Tunnelling and Underground Space Association

TBM segment lining section design of hypothetical subsea tunnels