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分析了静应力场对隧道及地下结构动力响应产生的影响。指出了静应力场的几种处理方法以及在隧道列车振动分析中宜采用的计算方法。以某一隧道为例,计算了其在列车动力荷载作用下的反应。计算表明:静应力场宜将高斯点应力和节点荷载同时输入。若仅输入高斯点应力或节点应力,而不输入节点荷载,以此为初始条件进行隧道列车荷载动力计算将产生错误的结果;为消除静力残余不平衡节点力在动力分析中影响,宜先不作用列车振动荷载,而是在静力残余不平衡节点力作用下进行动力分析,待体系逐步趋于静平衡状态后再施加动力荷载进行求解。
The influence of static stress field on the dynamic response of tunnel and underground structure is analyzed. Several treatment methods of static stress field and the calculation methods that should be adopted in tunnel train vibration analysis are pointed out. Taking a tunnel as an example, the response of the train under the dynamic load was calculated. Calculations show that the static stress field should be Gaussian point stress and node load input at the same time. If only Gaussian point stress or node stress is input but no node load is input, the calculation of tunnel train load dynamics will have wrong results. In order to eliminate the effect of static residual unbalance node force in dynamic analysis, No train vibration load, but in the static residual unbalanced node force dynamic analysis, until the system gradually become static equilibrium and then apply dynamic load solution.