基于时程分析法的沉管隧道横向地震响应分析  

LATERAL SEISMIC RESPONSE OF IMMERSED TUBE TUNNELS BASED ON TIME HISTORY ANALYSIS METHOD

作　　者：高翔 GAO Xiang(Shaanxi College of Communications Technology,Xi'an 710018,China)

机构地区：[1]陕西交通职业技术学院,西安710018

出　　处：《低温建筑技术》2024年第8期86-89,共4页Low Temperature Architecture Technology

摘　　要：沉管隧道工程由于所处环境的特殊性,地震影响更为严重,因此沉管隧道的地震响应分析极为重要。文中依托工程实践,建立有限元分析模型,对不同地基条件、不同埋深、不同地震烈度下沉管隧道的位移及受力的动响应规律进行对比分析。结果表明随着峰值加速度的增加,沉管隧道各结构点的水平位移、竖向位移峰值不断增加,但水平位移、竖向位移时程曲线变化基本一致;隧道地基土层比较薄时,最大轴力弯矩均位于隧道底板处;隧道埋深越大且贯穿土层越多,内力变形越大,相关结论对沉管隧道的抗震设计提供参考。Immersed tube tunnel projects often locate at the severe environment with seismic impact,therefore the seismic response analysis of which is extremely important.Based on engineering practice,this article establishes a fi⁃nite element analysis model to analyze the dynamic response laws of displacement and stress of immersed tube tun⁃nels under different foundation conditions,burial depths,and seismic intensities.The results show that as the peak acceleration increases,the horizontal and vertical displacement peaks of each structural point in the immersed tube tunnel continue to increase,but the changes in the time history curves of horizontal and vertical displacement are ba⁃sically consistent.When the soil layer of the tunnel foundation is relatively thin,the maximum axial force bending moment is located at the bottom plate of the tunnel.The deeper the tunnel is buried and the more it penetrates through the soil layer,the greater the internal force deformation.

关 键 词：沉管隧道 地震响应 水平位移 峰值加速度 内力变形 

分 类 号：TU447[建筑科学—岩土工程]