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 tunnel structure 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 loess tunnel engineering, the tunnel characteristics of the dynamic responses for 30 t axle load were analyzed. The calculation results show that: at the bottom of the tunnel structure, displacement, stress, acceleration increase significantly 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 depth direction is attenuated, and the attenuation speed is slow down. Tensile stress is increased along the depth in the center 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.
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