地震作用下隧道-列车系统动力响应及安全性分析

针对土体-隧道-列车动力相互作用的特点，建立地震作用下隧道-列车系统的三维有限元模型，运用基于接触负载均衡的显式并行计算方法求解计算。研究了地震作用下隧道-列车系统的动力响应，并对地铁列车运行安全性进行了评价，分析了行车速度及地震强度对地铁运行安全性的影响。数值分析结果表明:地震作用对隧道-列车系统动力响应影响显著，地震作用使系统动力响应明显增大，并使地铁运行安全性及平稳性大大降低；列车动载荷对地震作用下的隧道系统动力响应影响较小；无震工况下，地铁运行安全指标对车速变化并不敏感；地震工况下，随着地震强度的增大，车速对地铁运行安全性的影响逐渐增大。

DYNAMIC RESPONSE AND RUNNING SAFETY EVALUATION OF A TUNNEL-TRAIN SYSTEM DURING EARTHQUAKE

Considering the characteristics of dynamic interactions between soil and tunnel and a train system, a 3D dimensional finite element model for a tunnel-train system considering seismic loads was established, and the explicit parallel method based on contact balance bisection algorithm was used to solve the problem. The seismic dynamic response of a tunnel-train system was researched, and the running safety of the train was evaluated based on the numerical analysis. The influence of the train-speed and the earthquake intensity on running safety were analyzed. The numerical analysis results show that the effects of seismic loads on the dynamic responses of the tunnel-train system are significant, and the dynamic responses of the system subjected to an earthquake are greatly increased. The running safety and the running smoothness are greatly decreased. The dynamic train loads barely infect the dynamic response of a tunnel structure. The running safety indicators are not sensitive to the change of train-speed without an earthquake. However, during earthquake, the impact of the train-speed on the running safety increases with the increasing intensity of an earthquake.