重载列车作用下隧道衬砌结构动力响应分析

以山西中南部铁路通道某既有隧道为背景，结合现场实测数据进行荷载分析，得到列车激振力函数表达式，并求得80 km/h时30 t轴重列车荷载轮轨激振力时程曲线；运用快速拉格朗日差分软件FLAC3D，建立了重载列车荷载作用下隧道三维地层-结构计算模型，得出了隧道衬砌的动力响应分布，并分析了重载列车作用下，隧道结构的薄弱部位及会车对结构产生的影响。

Dynamic Response Analysis of Tunnel Lining Structure under the Action of Heavy Haul Train

Taking the existing tunnel of railway passage in the south-central part of Shanxi Province as the background, the expression of the train’s exciting force function is obtained by combining the measured field data for load analysis, and the time travel curve of wheel-rail excitation force under the 30 t axle train load at 80 km/h is obtained. The three-dimensional stratum-structure calculation model of the tunnel under load of heavy haul train is established using the fast Lagrangian difference software FLAC3D, and the dynamic response distribution of the tunnel lining is obtained. The weak parts of tunnel structure under the action of heavy haul train and the impact on the structure are also analyzed.