2023 Volume 79 Issue 19 Article ID: 23-19003
In recent years, cases of new or reinstalled inverts in mountain tunnels have been reported in many areas due to the occurrence of in-service ground heaving. It is assumed that the number of such cases will increase in the future, and the authors have been studying the rationalization of reinforcement measures. In this study, new invert shapes were assumed with work-saving construction in mind, and model experiment were conducted on a 1/100 of a full-scale tunnel, in which loads were applied vertically and horizontally assuming external forces, to verify the feasibility of the new invert shapes as a tunnel structure. The results showed that, although the shapes proposed in this study are not as good as the conventional inverted arch, it can be expected to have a certain degree of reinforcement effect. The validity of the experimental results was verified by reproducing the model experiments by numerical analysis, and the influence of the change in invert shape on the tunnel structure was discussed in terms of the tendency of stress generation.
