Non-linear Stiffness Behavior and Analysis of Tunnel Lining with Reinforcing Bars

Abstract

The deformation and cracking of mountain tunnel linings without reinforcing bars due to earth pressure has prompted a number of researchers to focus on methods of evaluating the strength of such linings as well as countermeasure design to prevent such damage. However, no satisfactory method has been found for evaluating the structural strength of urban tunnels with reinforcing bars, which offer increased safety against earth pressure. We therefore carried out model tests and numerical calculation on tunnels with reinforcing bars to investigate their mechanical properties. It was confirmed that tunnels are stabilized through the distribution of stress, even with the reduced stiffness and strength values obtained using the numerical calculation method described in this paper.