列车荷载作用下地铁重叠隧道的响应分析
Dynamic Responses of Overlapping Tunnels to Passing Trains
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摘要: 以深圳地铁一期工程区间近距离重叠隧道为背景,研究地铁运营期间,列车振动荷载对隧道结构的影 响.首先根据车辆-轮轨模型,确定列车振动荷载.然后采用释放荷载方法模拟地铁的开挖效应,确定初始应力 场,并通过对地铁结构体系进行模态分析,得到体系的振型和频率,以确定合理的阻尼系数和时间积分步长.最 后运用Newmark隐式时间积分法,分别研究在上行动载、下行动载和上下交会动载3种情况下,区间近距离重 叠隧道的动力响应,确定在列车振动荷载作用下衬砌结构的薄弱部位及其相应的位移和应力.Abstract: The phase I of Shenzhen subway project was taken as the background of this study. The vibration loads caused by passing trains are obtained with a wheel/track model available in literature. The initial stresses of after excavation are calculated with stress relaxation method. The rational time step and damping of vibration analysis are defined by vibration modes and frequencies obtained with modal analysis. The dynamic responses of overlapping subway tunnels to the vibrations caused by trains running from either directions (namely up and down directions) and vis- a-vis are studied with Newmark implicit time integration method. The stresses, displacements and weak portions in the liner are determined under the vibration loads.
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Key words:
- initial stress /
- modal analysis /
- overlap tunnel /
- train vibration /
- liner structure /
- dynamic FEM.
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