ABSTRACT
Although the construction joints of permanent linings are considered to influence the mechanical behavior of mountain tunnels, their location, surface treatment, and other factors are determined empirically. To propose new tunnel structures and specification concepts in the future, it is necessary to understand the mechanical behavior of linings with construction joints when subjected to external forces. The purpose of this study is to understand the influence of mechanical properties, such as the setting position of the joints, on the fundamental behavior of tunnels subjected to external forces. Therefore, the mechanical behaviors of tunnels with different joint positions under ground heaving or seismic loads were confirmed by numerical analysis and model experiments. The results confirmed that the stress and deformation behaviors differed depending on the position of the joints. These results indicate that certain joints have structurally disadvantageous conditions, and therefore considerations for construction are suggested, such as the need for reinforcement.
