LIU Jiaqiao,LIU Zhongxian,MENG Sibo.Broadband and Efficient Simulation of Dynamic Response of Lined Tunnels under Dynamic Rupture of Dip‑slip Faults[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(05):1042-1051.
LIU Jiaqiao,LIU Zhongxian,MENG Sibo.Broadband and Efficient Simulation of Dynamic Response of Lined Tunnels under Dynamic Rupture of Dip‑slip Faults[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(05):1042-1051. DOI: 10.13409/j.cnki.jdpme.20250215001.
Broadband and Efficient Simulation of Dynamic Response of Lined Tunnels under Dynamic Rupture of Dip‑slip Faults
near-fault ground motions exhibit characteristics such as hanging wall effects and velocity pulses
which can significantly exacerbate seismic damage to underground structures. The fast multipole method–indirect boundary element method‑finite element method (FMM-IBEM-FEM) was proposed to simulate the entire process of dip-slip fault dynamic rupture and tunnel response. The FMM-IBEM was employed to simulate fault rupture and large-scale site ground motions
leveraging its advantages of high solution accuracy and low computational storage requirements. The FEM was used for refined simulation of tunnels and surrounding near-surface domain. By applying viscoelastic artificial boundaries
the ground motions excited by fault dislocation were converted into equivalent nodal forces imposed on boundary nodes
enabling the stress and displacement transfer between the FMM-IBEM and FEM computational domains. Based on the proposed method
the effects of fault distance and fault dip angle on the seismic response of lined tunnels near dip-slip faults were investigated. The results showed that under the horizontal component of seismic response
peak circumferential stress in the tunnel lining occurred at the spandrel and arch foot
while under the vertical component
the peak appeared at the haunch and crown
with significant residual stress observed. When the fault distance was 2 000 m
the peak circumferential stress on the inner wall of the tunnel arch foot under the horizontal component of seismic response decreased by 54% compared to that at a fault distance of 0 m. Ground motions generated by faults with a dip angle of 90° had the most significant impact on the lined tunnel. However
special attention should also be paid to the dynamic response of lined tunnels in sites with dip-slip faults of less than 45°.
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