基于车-轨-隧一体化模型的重载铁路隧道动力响应特性分析  

Study on the dynamic responses of heavy haul railway tunnel based on the model of train-track-tunnel coupling system

作　　者：肖鹏[1] 彭立敏[1] 施成华[1] 杨高尚[1] 雷明锋[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2017年第6期1263-1271,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51278494);国家自然科学基金煤炭联合基金资助项目(U1361204);国家自然科学基金高铁联合基金资助项目(U1434206)

摘　　要：基于赫兹非线性理论,考虑轮轨接触关系,建立车辆-轨道-隧道一体化三维空间耦合模型,对重载列车作用下隧道结构的动力响应进行计算分析。通过与实测值的对比分析,验证该一体化计算模型的可靠性。进一步针对蒙华铁路黄土隧道工程,探讨30 t轴重列车荷载作用下隧道结构的动力响应特征。计算结果表明:30 t轴重列车荷载作用下,隧道底部结构的位移、应力和加速度显著增大,受列车振动荷载的影响明显;在轨下断面和隧道中心断面,压应力都沿深度方向衰减,衰减速度由快到缓;隧道中心断面拉应力沿深度方向增长,在初支底部出现最大拉应力;列车荷载对结构的整体受力产生不利影响。Based on Hertz nonlinear theory, and considering contacts between the wheel and rail, a train-track-tunnel system coupling 3-D finite element model was established, and the dynamic response of tunnelstructure under heavy load was calculated and analyzed. Through the comparative analysis with the measured data,the reliability of the integrated calculation model was verified. Furthermore, aimed at the Menghua railway loesstunnel engineering, the tunnel characteristics of the dynamic responses for 30 t axle load were analyzed. Thecalculation results show that： at the bottom of the tunnel structure, displacement, stress, acceleration increasesignificantly under 30 t axle train load, and they are significantly affected by the influence of train vibration load.At the lower section of the track and the center section of the tunnel, the compressive stress along the depthdirection is attenuated, and the attenuation speed is slow down. Tensile stress is increased along the depth in thecenter section of the tunnel, the maximum tensile stress appears at the bottom of the primary support of tunnels.All of this have a negative impact on the tunnel structure.

关 键 词：重载铁路隧道 车-轨-隧一体化模型 动力响应 

分 类 号：U25[交通运输工程—道路与铁道工程]