Study on Structural Damage Characteristics of Tunnels Crossing Active Faults Based on Layered Dislocation Theory
To investigate the damage characteristics of tunnel structures under fault dislocation,a model for tunnels crossing faults was developed based on layered dislocation theory and a concrete incremental elasto-plastic damage model.The damage characteristics of lining structures under different conditions were analyzed,and the model's ac-curacy was verified using actual engineering cases.The results indicate that:Composite linings struggle to resist large-scale dislocation.For the case study tunnel,the composite lining structure at the fault failed under moderate-to-strong seismic events with a magnitude of Mw=5.0～5.2;With changes in the fault dislocation angle,the tensile and compressive damage zones of the lining structure shift correspondingly.Tensile damage zones align with the di-rection of fault dislocation,while compressive damage zones are perpendicular to the dislocation direction;Strike-slip dislocation causes more severe damage to lining structures compared to dip-slip dislocation;With increasing burial depth,the damage zones of the lining structure gradually concentrate near the fault and the haunches of the lining.
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