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以北京某地铁标段减振措施研究为背景,研究地铁运营期间,列车振动荷载产生的低频地表响应的传播衰减规律及相应减振措施的效果,采用Ansys软件进行有限元建模,利用改进的Newmark隐式时间积分法,针对5种减振工况,进行动力响应求解。分析表明,与常规浮置板相比,新型的铜弹簧浮置板轨道结构对4Hz以上的低频振动在50m以内有明显减振效果,但50m以外效果不明显,且单纯加重浮置板重量对低频减振贡献不显著;同时辅助施作衬砌间的橡胶板垫层低频减振效果不明显。
Based on the research on the vibration mitigation measures of a subway section in Beijing, this paper studies the propagation attenuation law of low frequency ground surface response caused by train vibration load and the effect of the corresponding vibration mitigation measures during subway operation. The finite element modeling is carried out by using Ansys software, Newmark implicit time integration method, for five kinds of vibration conditions, dynamic response solution. The analysis shows that compared with the conventional floating plate, the new copper spring floating plate track structure has a significant damping effect on the low frequency vibration above 4Hz within 50m, but the effect is not obvious beyond 50m, and the weight of the floating plate is merely increased Low-frequency damping contribution is not significant; at the same time auxiliary lining rubber lining cushion low frequency damping effect is not obvious.