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

发布时间：2018-03-21 22:16

本文选题：重载铁路隧道　切入点：车-轨-隧一体化模型　出处：《铁道科学与工程学报》2017年06期 　论文类型：期刊论文

【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。
[Abstract]:Based on Hertz's nonlinear theory and considering wheel-rail contact relationship, a three-dimensional coupling model of vehicle-rail-tunnel integration is established to calculate and analyze the dynamic response of tunnel structure under the action of heavy-haul train. The reliability of the integrated calculation model is verified. The dynamic response characteristics of the tunnel structure under the load of 30 t axle load train are further discussed for the loess tunnel project of the Menghua railway. The calculation results show that under the load of 30 t axle load train, the dynamic response of the tunnel structure is discussed. The displacement, stress and acceleration of the structure at the bottom of the tunnel increase significantly, which is obviously affected by the vibration load of the train, and the compressive stress attenuates along the depth direction, and the attenuation speed changes from fast to slow. The tensile stress of the central section of the tunnel increases along the depth direction, and the maximum tensile stress appears at the bottom of the initial support, and the train load has a negative effect on the overall stress of the structure.
【作者单位】：中南大学土木工程学院;
【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)
【分类号】：U451

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