高铁线路隧道－桥梁－隧道路段常伴随强烈的横风，列车行驶至隧道与桥梁连接段时常常受到横风的突然冲击，严重影响了列车的行车安全性。基于计算流体力学RNG 湍流模型和多孔介质理论，建立列车－隧道－桥梁－风屏障三维 CFD 数值模型和风－车－轨－桥动力耦合分析模型，研究了高速列车通过隧道－桥梁－隧道路段过程中列车的气动荷载和行车安全指标的变化特性。结果表明: 桥隧相连段设置风屏障后，各节车厢的气动荷载突变幅值显著降低，降幅达 50% 以上，其中横向力和倾覆力矩受风屏障的影响最为显著，降幅高达 88%以上; 设置风屏障后列车行车安全指标显著降低，迎风侧和背风侧各轮对 (除了头车 1、3 号轮对外) 的安全指标波动幅度相同; 头车的安全指标对整个列车行车安全性起控制作用，尤其是头车转向架前轮 (即 1、3 号轮对) 的; 列车由隧道驶入桥梁过程中的行车安全性较由桥梁驶入隧道过程的小。

The tunnel-bridge-tunnel section of high-speed railway is often accompanied by strong cross-wind． When the train runs through the section，it is often impacted by the cross wind，which seriously endanger the driving safe-ty of the train． A three-dimensional CFD numerical model of train-tunnel-bridge-wind barrier and a dynamic cou-pling analysis model of wind-train-rail-bridge were established based on the computational fluid dynamics ＲNG tur-bulence model and the theory of porous media． The variation characteristics of aerodynamic load and driving safety index of high-speed trains in the process of passing through the tunnel-bridge-tunnel section were studied． The re-sults show that the abrupt amplitude of aerodynamic load of each compartment was significantly reduced by more than 50%，after the wind barrier was set at the tunnel-bridge-tunnel section． The transverse force and overturning moment were most significantly affected by the wind barrier，with a decrease of more than 88%． The wind barrier can significantly decrease the driving safety index of the train，and the fluctuation amplitude of the safety index of the windward and leeward wheelsets (except the first and third wheelsets of the head car) was the same． The safety
index of the head car plays a role in controlling the safety of the whole train，especially the front wheels of the bogie of the head car (the first and third wheelsets)． The process of running from the tunnel onto the bridge is less safe than that of running from the bridge into the tunnel．