Study on Anti-Dislocation Performance of a Novel Composite Anti-Dislocation Tunnel Structure Crossing Strike-Slip Faults

A novel composite anti-dislocation tunnel structure (CATS) is proposed as an anti-dislocation measure for tunnels crossing strike-slip faults. The anti-dislocation performance of CATS is verified through numerical simulation. Parameter analysis is presented for CATS, including the circumferential length of the buffer layer, the buffer layer thickness, segment length, fault dip angle, and fault displacement. The results highlight that CATS can effectively reduce both the peak value and the longitudinal damage distribution range of compressive and tensile damage to the secondary lining. The buffer layer in CATS helps reduce compressive damage to the secondary lining, while the flexible joint in CATS aids in reducing tensile damage to the secondary lining. CATS demonstrates good anti-dislocation performance compared to tunnels without anti-dislocation measures or those with only flexible joints. The buffer layer thickness has little effect on the anti-dislocation performance, while a smaller segment length is more conducive to enhancing the anti-dislocation performance of CATS. The anti-dislocation performance of CATS increases with an increasing fault dip angle; conversely, it decreases as the fault displacement increases. These results can provide valuable references for tunnel anti-dislocation design.