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基于轮轨相互作用原理,建立了城轨交通高架线路列车振动荷载激励函数。将该激励力作用在有限元软件建立的三维轨道支承结构和土体传播路径计算模型上,对地铁运行引起的周边环境振动响应进行了仿真模拟,并利用现场实测数据进行了比较和验证。进一步,分析了列车运行速度和场地土特性对环境振动的参数影响。在对各参数的影响特征进行了定量分析的基础上,通过统计分析,建立了城市轨道交通高架线路环境振动的振级预测公式,并利用现场实测数据进行了验证。研究表明,仿真模拟和预测结果能够较为真实的反映城轨交通高架线路运行引起的环境振动的实际情况。
Based on the principle of wheel-rail interaction, the excitation function of train vibration load on elevated line of urban rail transit is established. The excitation force is applied to the three-dimensional track support structure and soil propagation path calculation model established by finite element software. The vibration response of the surrounding environment caused by subway operation is simulated and compared with the field measurement data. Further, the influence of train speed and site soil characteristics on environmental vibration parameters is analyzed. Based on the quantitative analysis of the influence characteristics of each parameter, the vibration level prediction formula of environmental vibration of elevated railway line in urban rail transit was established by statistical analysis, and the field vibration data were verified by field measurements. The research shows that the simulation and prediction results can reflect the actual situation of environmental vibration caused by the operation of urban rail transit overhead line.