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对高架轨道交通系统引起的环境振动影响进行理论分析和数值计算,建立了车-桥和墩-土两个子系统模型,通过车-桥子系统模型得到作用在墩-土子系统上的动荷载,然后利用墩-土子系统模型计算出在该荷载作用下周围环境的动力响应;进一步通过参数分析研究了各种因素对环境振动的影响规律。结果表明:高架轨道交通引起的环境振动随振源距离的增大而逐渐减小,并且受到桥梁跨度、桥梁质量、桥墩基础埋深、车辆轴重、列车速度、土的性质及支座刚度的影响。根据计算结果运用回归的方法提出了高架轨道交通引起环境振动的预测公式,并通过与北京地铁5号线的实测结果和其他预测公式的比较进行了验证,表明所提出的预测公式具有较高的准确度和适应性。
The theoretical analysis and numerical calculation of the environmental vibration caused by overhead rail transit system are carried out. Two subsystem models of vehicle-bridge and piers-soil are established. Dynamic loads acting on the piers and soil sub-systems are obtained through the vehicle-bridge subsystem model Then the dynamic response of the surrounding environment under the load is calculated by using the pier-soil subsystem model. The influence of various factors on the environmental vibration is further studied through parameter analysis. The results show that the environmental vibration caused by elevated rail transit gradually decreases with the increase of vibration source distance and is affected by the span of bridge, the quality of bridge, the depth of foundation of bridge piers, axle load, train speed, soil property and bearing stiffness influences. According to the calculation results, the regression equation is used to predict the environmental vibration caused by elevated rail transit. The results are compared with the actual measured results of Beijing Metro Line 5 and other prediction formulas. The results show that the proposed prediction formula has high Accuracy and adaptability.