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以在建北京地下直径线为背景,选取了2个典型评估断面,建立二维动力有限元计算模型,应用车辆—轨道耦合动力学理论,计算得到作用在隧道结构上的列车动荷载,并作为激励作用于有限元模型上,通过数值模拟计算,预测新线隧道北京地下直径线开通运营后对临近既有地铁结构振动的影响。根据对结构物安全的振动控制标准,确定以竖向速度作为既有地铁结构振动响应的安全性评估标准。结果表明:地铁列车运行对其自身结构的振动影响要大于地下直径线列车运行对地铁结构的振动影响;地下直径线列车的运营使邻近地铁结构动力响应增加,对其耐久性和正常使用有一定影响,建议在这些区段采取减振措施。
Taking the underground diameter line under construction in Beijing as an example, two typical evaluation sections are selected and a two-dimensional dynamic finite element model is established. By applying the theory of vehicle-track coupling dynamics, the train dynamic load acting on the tunnel structure is calculated and used as Incentives are applied to the finite element model. Numerical simulations are performed to predict the influence of the underground tunnel on the vibration of the existing metro structure after the opening of the underground line in Beijing. According to the vibration control standard of structure safety, the vertical speed is determined as the safety evaluation standard of existing subway structure vibration response. The results show that the impact of subway train operation on the vibration of its own structure is greater than that of underground diameter train operation on the subway structure. The operation of underground diameter railway train increases the dynamic response of the adjacent metro structure, and has certain durability and normal use It is suggested that vibration mitigation measures should be taken in these sections.