LI Mingda,LANG Qiuling,LI Yanpeng,et al.Study on Seismic Response and Damage Characteristics of Karst Shield Tunnels under Oblique Incidence of SV/P Waves[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(04):796-806.
LI Mingda,LANG Qiuling,LI Yanpeng,et al.Study on Seismic Response and Damage Characteristics of Karst Shield Tunnels under Oblique Incidence of SV/P Waves[J].Journal of Disaster Prevention and Mitigation Engineering,2025,45(04):796-806. DOI: 10.13409/j.cnki.jdpme.20240221001.
Study on Seismic Response and Damage Characteristics of Karst Shield Tunnels under Oblique Incidence of SV/P Waves
This study aims to investigate the influence of oblique incidence of SV and P waves on the dynamic response and damage characteristics of tunnel structures when a lateral karst cave is located behind the tunnel along the seismic wave propagation path. The viscous-spring artificial boundary and seismic wave input at arbitrary angles were implemented using finite element software
and their accuracy was verified. The deformation and stress distribution characteristics of the tunnel structure at different incidence angles of SV and P waves were analyzed. Based on the relationship between the tensile damage factor and concrete crack width
three damage states were proposed
and the structural damage evolution process and damage characteristics were compared. The results showed that as the incidence angle increased
both the structural deformation and stress increased
with significant spatial differences in stress distribution. Additionally
the lateral karst cave had a mitigating effect on the tensile stress of the structure near the cave. When the incidence angle of the SV wave was 30°
the tensile stress at the vault and bottom was 1.96 times and 3.07 times that of the P wave
respectively. When the incidence angle of the SV wave was at 30° and the P wave 60°
axial cracks with a width greater than 0.2 mm appeared on the outer surfaces of the vault and bottom. As the seismic waves continued
the tunnel's damage gradually worsened
with localized damage eventually concentrated at the bottom. The lateral karst cave contributes to energy dissipation and vibration reduction to some extent
but it also exacerbates localized structural damage.
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references
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