浅埋出入口通道交叉段地震动力特性及稳定性分析

地铁出入口通道通常覆土较浅，结构形式变化较大，刚度不连续，特别在交叉口段，结构衔接薄弱，抗震性能差。基于土-结构相互作用模型，利用黏-弹性边界条件，运用时程分析方法研究出入口通道交叉口段地震动力响应。对交叉口段地震动力特性及稳定性进行分析总结，得出交叉口段位移、应力及加速度的动力响应及分布特性，提出其抗震加固部位及范围等的处置措施，以期为高震区地铁抗减震设计提供一定参考。

Analysis on Dynamic Seismic behavior and Stability of Intersection Parts of Shallow-covered Exit/Entrance Tunnels of Metro Works

The exit/entrance tunnels of Metro works usually have shallow covers,dramatic variations of structure types and interrupted rigidity.Especially in the intersection parts,the structures have poor connections and poor aseismic behavior.The dynamic seismic response of the intersection parts of the exit/entrance tunnels of Metro works is studied on basis of soil-structure interacting model,by means of visco-elastic boundary and time-dependent analysis.The dynamic seismic behavior and stability of the intersection parts are analyzed and summarized,the dynamic response and distribution rules of the displacement,stress and acceleration of the intersection parts are obtained,and positions and scopes of the aseismic reinforcement are proposed.The paper can provide reference for the aseismic design of Metro works in high seismic regions in the future.