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对沪宁城际铁路CRH动车组运行引起的高架桥段地面振动竖向速度和加速度进行了现场测试,分析了地面振动特征及其传播的衰减规律。结果表明:CRH动车组运行引起的地面振动主频在70Hz以下,属于低频振动;地面振动峰值速度和加速度随着离高架桥距离的增大而减小,20m以内地面振动衰减幅度较大;地面振动峰值随列车时速的提高而增大,车厢数量对地面振动峰值和主频成分的影响不明显;CRH动车组运行引起的地面振动对一般性建筑物影响不大,列车时速为300km左右时,地面振动速度超过办公室等公共建筑的允许值,列车时速为200km左右时,地面振动速度超过居民住宅的允许值;与其他高速铁路的地面振动实测值相比,沪宁城际铁路CRH动车组运行引起的高架桥段地面振动强度相对较低。
The vertical vibration and acceleration of the viaduct section caused by the operation of the CRH EMU of the Shanghai-Nanjing intercity railway were tested in the field. The characteristics of the ground vibration and the attenuation of the propagation were analyzed. The results show that the main frequency of ground vibration caused by the operation of CRH EMUs is under 70 Hz, which belongs to the low frequency vibration. The peak vibration velocity and acceleration of ground vibration decrease with the increase of the distance from the viaduct, and the attenuation of ground vibration within 20 m is large. The peak value increases with the increase of train speed, and the number of train cars has no obvious effect on the peak ground vibration and main frequency components. The ground vibration caused by the operation of CRH EMUs has little impact on the general buildings. When the train speed is about 300 km per hour, Vibration speed exceeds the allowable value of public buildings such as offices. When the train speed is about 200km per hour, the vibration velocity of the ground exceeds the allowable value of residential buildings. Compared with the measured ground vibration of other high-speed railways, the operation of CRH EMUs of Shanghai-Nanjing intercity railway Of the viaduct section of the ground vibration intensity is relatively low.