隧道内弹塑性钢管混凝土防撞系统设计及列车撞击荷载研究

Design of Elastoplastic Concrete⁃filled Steel⁃Tube Anti⁃collision System in Tunnel and Study of Train Impact Load

为了减轻列车在隧道内脱轨后引发的灾害,提出了一种设置于隧道内用于抵挡高速列车脱轨后撞击的新型防撞系统。该系统由W梁、W梁连接件、吸能块和钢管混凝土防撞墩组成。为了研究新型防撞系统的适用性,建立了列车-防撞系统-隧道耦合模型,计算得到在不同撞击角度和撞击速度下列车撞击力时程曲线,分析列车撞击力峰值与列车撞击角度、速度的关系,最不利工况下车头的横向速度、位移时程曲线,以及撞击后列车与防撞系统的形态变化。结果表明:列车撞击力随撞击角度和速度的增大而增大,且撞击角度变化对撞击力影响较大;新型防撞系统可以抵挡列车的撞击作用,吸收部分碰撞能量,并且受到撞击后整体结构保持完整。

A new type of anti-collision system installed in tunnel was proposed to withstand the impact of high speed train derailment.It is composed of a W-shaped beam,a W-shaped connecting part,an energy absorbing block and concrete-filled steel-tube.In order to study the applicability of the anti-collision system,a train-anti-collision systemtunnel coupling model was established,the impact force time-history curves of trains at different impact angle and impact speed were obtained.The relationship between the peak impact force and the impact angle and speed of the train was also analyzed,the lateral velocity and displacement curves of the locomotive under the most dangerous conditions,and the morphological changes of train and anti-collision system after the collision were analyzed.The results show that the impact force of the train increases with the increase of impact speed and impact angle,and the impact angle change has great influence on the impact force.The new anti-collision system can withstand the impact of a train and can absorb some of the impact energy,and the whole structure remains intact after the impact.