近断层地震作用下城市轨道交通隧道及道床结构力学响应分析

依托乌鲁木齐轨道交通2号线工程，针对近断层修建城市轨道交通隧道工程时地震作用引起道床结构动力响应问题，采用有限差分法模拟分析明挖法双线箱形曲拱形地铁隧道道床结构在地震作用下的位移及速度响应，并探讨了地震作用对隧道下部结构及道床的作用特性。研究结果表明:地震作用下，隧道结构各部位位移及速度响应时程曲线高度重合，力学响应规律一致，但响应幅值略有差异，道床的响应幅值最小，拱顶响应幅值最大，为重点设防部位。地震发生后，隧道结构未发生严重的扭转变形，道床结构也未发生明显塑性变形。

Mechanical Response Analysis of Urban Rail Transit Tunnel and Ballast Bed Structure under Near Fault Earthquake

Based on the Urumqi rail transit line 2 project, by means of numerical simulation, the displacement and velocity response of the open-cut double-line box-curved arch subway tunnel ballast bed structure under seismic action are analyzed and the action characteristics of seismic action on the substructure and the ballast bed of the tunnel are discussed aiming at the dynamic response of ballast bed structure caused by the action of earthquake when the urban rail transit tunnel was built near fault. The research results show that the mechanical response of each part of the tunnel structure under earthquake is highly consistent, but the response amplitude is slightly different. The response amplitude of the ballast bed is the smallest and that of the vault is the largest, which is the key defensive position. After the earthquake, the tunnel structure did not have serious torsional deformation, and the ballast bed structure did not have obvious plastic deformation.