Effect of non-circular tunnel linings on pressure transients induced by high-speed train passes through a tunnel based on moving model test

Abstract The setting of tunnel linings is an effective way to reparation tunnel damage, which can also improve the tunnel surface structure. However, increased linings will change the cross-sectional area of the tunnel, affecting the pressure transients induced by the train passing through the tunnel. In this study, the non-circular linings' influence on the pressure transients is analyzed based on moving model tests. Six distribution modes of the non-circular linings inside the tunnel are adopted for the experimental test. The characteristics of pressure transients induced by a single train passing through a tunnel are discussed and compared with the configuration without lining. The results of this experiment show that the influence of the non-circular linings distribution along the circumferential direction and the length direction is significant to a certain extent, which can guide the design of tunnel lining. These findings suggest that it is feasible to install non-circular lining in the tunnel to maintain tunnel damage, and reasonable distribution of the non-circular lining can also reduce the pressure amplitude of the initial compression wave.