岩土工程学报2026，Vol.48Issue(3)：632-641,654,11.DOI:10.11779/CJGE20241228
考虑轴力与刚度突变的盾构隧道纵向地震响应解析
Theoretical analysis for longitudinal seismic responses of shield tunnel by considering axial force and abrupt change in longitudinal stiffness
摘要
Abstract
In order to reasonably estimate the longitudinal seismic responses of shield tunnels,the shield tunnel is regarded as a Timoshenko beam resting on a Pasternak elastic foundation.Considering the axial force and the abrupt change in stiffness,a theoretical calculation model under the joint action of longitudinal and transverse strata displacements is proposed and solved by finite difference method.The theoretical solutions are compared with the numerical simulation results to verify its validity and reliability,then the influences of six key parameters on the longitudinal seismic response are further explored.The increase in shield tunnel stiffness can effectively improve the seismic performance of the tunnel.However,in the vicinity of the stiffness variation,the segments with relatively small tunnel stiffness(regular or degraded segments)may experience higher local deformation under seismic actions.Reducing the longitudinal stiffness ratio and shortening the length of strengthening section can significantly mitigate the adverse seismic response of tunnel lining caused by abrupt change in stiffness.The local deformation at the tunnel is positively correlated with the foundation reaction coefficient,and the local deformation increases and then decreases with the increase of wavelength.Seismic waves with wavelengths between 20 m and 120 m are more likely to lead to larger opening and dislocation,on the scenario of higher foundation reaction coefficient.The residual axial force can improve the seismic performance of shield tunnel to a certain extent,especially when the angle of incidence and tunnel stiffness are relatively small.关键词
盾构隧道/纵向地震响应/反应位移法/纵向刚度突变Key words
shield tunnel/longitudinal seismic response/response displacement method/abrupt change in longitudinal stiffness分类
建筑与水利引用本文复制引用
关振长,杨泽龙,任璐瑶,陈思明,罗嵩..考虑轴力与刚度突变的盾构隧道纵向地震响应解析[J].岩土工程学报,2026,48(3):632-641,654,11.基金项目
国家自然科学基金项目(52278399)This work was supported by the National Natural Science Foundation of China(Grant No.52278399). （52278399）
