Model tests on damping shake technology of shock absorption layer of tunnels crossing stick-slip faults

In order to study the damping shake technology of shock absorption layer between the primary lining and the secondary lining under the influence of fault stick-slip movement, large-scale model tests on the shock absorption layers with different thicknesses are conducted. Firstly, the test schemes are proposed, including the similarity factor, test facilities and materials test grouping. Then, the test process is introduced. Finally, the test data are analyzed, mainly including three aspects of structural internal force, longitudinal strain and contact pressure of tunnel vault. The results show that the effect of fault stick-slip movement of hanging wall is larger than that of footwall. The damping effect of hanging wall tunnel setting shock absorption layer is significantly better than that of footwall. The damping effect of shock absorption layer (thickness of 10 cm) between the primary lining and the secondary lining is significantly better than that of shock absorption layer (thickness between 5 and 20 cm). So, the damping mode of shock absorption layer (thickness of 10 cm) between the primary lining and the secondary lining is recommended. This study is significant to the damping design and technology of tunnels crossing stick-slip faults.