Stress and Displacement of Deep-Buried Composite Lining Tunnel under Different Contact Conditions

Stress and displacement of the composite lining are important factors to be considered during tunnel design. By complex variable method, analytical solutions for stress surrounding rock, primary support secondary satisfying interface continuity boundary conditions under far-field stresses derived. Taking railway as an example, distributions along boundaries given, which was in good agreement with numerical solution calculated by finite element software. The results show that maximum normal ratio (load sharing ratio) outer between is 0.74. radial inner support, change consistently. settlement uplift occur at vault bottom, respectively. tangential compressive stress, while tensile stress. smaller than allowable concrete.