悬浮隧道地震动力响应及参数影响规律研究  

Seismic Dynamic Response and Parameter Influence Law of Submerged Floating Tunnel

作　　者：王丕光[1] 黄雅如 曲杨[1] 阳志文 WANG Piguang;HUANG Yaru;QU Yang;YANG Zhiwen(State Key Laboratory of Bridge Engineering Safety and Resilience,Beijing University of Technology,Beijing 100124,China;National Engineering Research Center for Port Hydraulic Construction Technology,Tianjin Institute of Water Transport Engineering Science,Ministry of Transport,Tianjin 300456,China)

机构地区：[1]北京工业大学桥梁工程安全与韧性全国重点实验室,北京100124 [2]交通运输部天津水运工程科学研究院港口水工建筑技术国家工程研究中心,天津300456

出　　处：《防灾科技学院学报》2024年第2期29-42,共14页Journal of Institute of Disaster Prevention

基　　金：国家重点研发计划(2022YFB2602800);国家自然科学基金项目(52078010、52101321)。

摘　　要：为研究地震作用下悬浮隧道的动力响应问题,建立悬浮隧道二维截断有限元模型,基于Morison方程确定隧道管体和锚索上的水动力载荷,地震荷载的输入通过在锚索底部与海床铰接位置处输入地震加速度响应时程来实现,分别研究了不同地震类型、强度及双向地震动对悬浮隧道系统动力响应的影响,同时分析了隧道附加质量,结构阻尼与隧道、锚索拖曳力等参数对悬浮隧道系统响应的影响规律。结果表明:不同特性的地震动引发的隧道响应存在显著差异,能量较为集中的长周期地震动会引发较大的隧道响应,而能量较为分散的短周期地震动引发的隧道响应相对较小。当地震动引发隧道响应较小时,单向地震动单独作用仅能激发所对应方向的隧道响应;当地震动引发隧道响应较大时,水平方向地震动单独作用除了激发隧道的水平响应外还会激发一定的竖向响应,此时双向地震动作用下隧道加速度放大系数低于单向地震动单独作用,且放大系数随着地震强度的增大而减小。多数时间范围内,双向地震动的作用下锚索的张力波动稍大于单向地震动单独作用时的锚索张力;隧道附加质量、结构阻尼以及隧道、锚索拖曳力等参数均对隧道响应产生一定的抑制效果,但隧道附加质量会增大锚索张力。In order to study the dynamic response of the submerged floating tunnel(SFT)under the earthquake,we established a two-dimensional truncated finite element model of the SFT.The hydrodynamic loads on the tunnel tube and mooring chain were determined by using Morison's equation,and the input of the seismic load was realized by inputting the seismic acceleration response time-history at the hinged position between the bottom of the mooring chain and the seabed.The effects of different types and strengths of the earthquake,and bidirectional ground motion on the dynamic response of the SFT system were studied respectively,and the influence of the parameters,such as the added mass of the tunnel,the structural damping,and the tunnel and mooring chain drag force on the response of the SFT system was also analyzed.The results show that there are significant differences in tunnel responses caused by different ground motions,the long-period ground motion with concentrated energy can cause a large tunnel response,while the short-period ground motion with more dispersed energy can cause a relatively small tunnel response.When the tunnel response caused by the ground motion is small,the action of unidirectional ground motion can only stimulate the tunnel response in its corresponding direction.When the tunnel response caused by the ground motion is large,the horizontal ground motion can not only stimulate the horizontal response of the tunnel,but also stimulate the vertical response.At this time,the acceleration amplification coefficient of the tunnel under the action of bidirectional ground motion is lower than that under the action of unidirectional ground motion,and the amplification coefficient decreases with the increase of seismic intensity.In most time ranges,the tension fluctuation of mooring chain under the action of bidirectional ground motion is slightly larger than that under the action of unidirectional ground motion.The added mass of the tunnel,the structural damping,and the tunnel and mooring chain drag force all

关 键 词：隧道工程 悬浮隧道 数值模拟 地震荷载 动力响应 

分 类 号：U452.2[建筑科学—桥梁与隧道工程]