防灾减灾工程学报2025，Vol.45Issue(4)：796-806,11.DOI:10.13409/j.cnki.jdpme.20240221001
SV/P波斜入射下岩溶盾构隧道的地震响应和损伤研究
Study on Seismic Response and Damage Characteristics of Karst Shield Tunnels under Oblique Incidence of SV/P Waves
摘要
Abstract
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 accu-racy was verified.The deformation and stress distribution characteristics of the tunnel structure at dif-ferent incidence angles of SV and P waves were analyzed.Based on the relationship between the ten-sile 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 ten-sile 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.关键词
盾构隧道/岩溶溶洞/地震响应/损伤特征/数值模拟Key words
shield tunnel/karst cave/seismic response/damage characteristics/numerical simulation分类
建筑与水利引用本文复制引用
李明达,郎秋玲,李艳朋,张以晨,孟康,周晶..SV/P波斜入射下岩溶盾构隧道的地震响应和损伤研究[J].防灾减灾工程学报,2025,45(4):796-806,11.基金项目
吉林省教育厅科学研究项目(JJKH20251163KJ)资助 （JJKH20251163KJ）
