地铁曲线波磨地段振动特性影响因素分析

Analysis of Influencing Factors of Vibration Characteristics in Curved Corrugation Sections of Subways

为研究地铁曲线波磨地段振动特性影响因素,建立车辆-轨道及轨道-隧道-大地模型,分析不同波磨波深、隧道埋深、轨道减振措施下隧道壁及地面的振动响应。结果表明:减小钢轨波磨波深或增加隧道埋深,隧道壁和地面的垂向最大加速度和加速度分频最大振级均有减小趋势;采取不同轨道减振措施时,浮置板的减振效果最佳;隧道埋深和轨道减振措施的改变,不会改变隧道壁和地面加速度峰值的频段区间及加速度分频最大振级的中心频率;振动在隧道壁传递到地面的过程中高频衰减较快。

In order to study the influencing factors of the vibration characteristics of the curved corrugation section of the subway,the vehicle-track and track-tunnel-earth models are established,and the vibration responses of the tunnel wall and ground under different corrugation wave depths,tunnel burial depths,and track vibration reduction measures are analyzed.The results show that the maximum vertical acceleration and the maximum acceleration frequency division vibration level of the tunnel wall and ground have a decreasing trend when the rail corrugation depth is reduced or the tunnel burial depth is increased;When different track damping measures are synthetically adopted,the floating slab has the best damping effect.Changing tunnel burial depth and track vibration reduction measures has no influence on the frequency range of the tunnel wall,ground acceleration peak value and the center frequency of the maximum vibration level of the acceleration frequency division;The high frequency vibration attenuates more rapidly in the process of vibration transmission from the tunnel wall to the ground.