列车引起饱和土场地地面振动实测分析

Test Analysis of Ground Vibration in Saturated Soil Site Caused by Train

为了研究列车经过引起的环境振动在饱和土场地的传播特性,对滨洲(哈尔滨到满洲里)铁路大庆市龙凤湿地段列车经过引起轨道附近地面振动进行现场观测。通过振动级通用方法计算得到线型台阵各实测点三分之一倍频程各中心频率的加速度振动级,对比研究客、货两类列车引起的振动加速度幅值和加速度振动级衰减关系。结果表明:随着距轨道中心线距离的增加,加速度幅值和加速度振动级逐渐减小;列车经过时,在30 Hz^80 Hz频段振动加速度级增加;列车运行速度对振动加速度级的影响比载重和车厢数大。

In order to investigate propagation characteristics of the environmental vibration caused by train in saturated soil site,a practical test of ground vibration was conducted in Bin-Zhou rail,which passed the Longfeng wetland of Daqing.The acceleration vibration level of a third octave center frequency of the linear array every measured point was obtained by the general formula ofvibration level,comparatively study the attenuation relationship of vibration acceleration amplitude and the acceleration vibration attenuation relations caused by passenger train and cargo train.The test results showed that the attenuation relationship of vibration acceleration amplitude and the vibration acceleration level of vibration was substantially decreased with the increasing distance from the point to the track. When the train passed,the vibration acceleration increased in 30 Hz-80 Hz.The influence of train running speed was bigger than load and the number of cars for vibration acceleration level.