Abstract:In order to improve the safety and stability of tunnels under earthquake action, and address the pain points of weak deformation resistance and insufficient seismic performance of traditional tunnel support systems, the seismic response research and numerical simulation analysis are conducted on a new prefabricated tunnel support system. Firstly, the new support system composed of corrugated reinforced composite support structure, foam waterproof concrete filling layer and “honeycomb” prefabricated arched support components is systematically sorted out to clarify its structural characteristics and seismic working principle. Then, relying on shaking table tests to obtain mechanical parameters, a three-dimensional numerical model of a grade V surrounding rock tunnel is established using Midas GTS NX, the viscoelastic boundaries are set and EI-Centro waves are input to carry out the dynamic time-history analysis, and the dynamic response law of different structural parts is observed. Finally, the distribution characteristics of stress displacement and the structural weak links under transverse earthquake action are analyzed. The seismic mechanical properties and key control parts of the new support system are clarified, which provides important reference for seismic design, scheme optimization and safety indicator formulation of the tunnels.
