沪宁城际铁路高架桥段CRH动车组运行引起的地面振动现场测试与分析

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。

In-situ Testing and Analysis of Ground Vibration Caused by CRH Trains Running on Viaduct of Hu-Ning Intercity Railway

Based on the measurement of the vertical velocity and acceleration caused by CRH trains running on viaduct of Hu-Ning Intercity Railway,the characteristics and propagation attenuation rule of the ground vibration are analyzed.The result shows that the main frequency of ground vibration caused by the CRH trains running is less than 70 Hz,which belongs to low frequency vibration.The peak value of ground vibration velocity and acceleration decreases with the increased distance between the ground surface and the viaduct.The ground vibration attenuates significantly when the distance is within 20 m.The peak value of ground vibration increases with increasing train speed.The number of carriages has no obvious effect on the peak value and main frequency of ground vibration.The ground vibration caused by the CRH trains running has little effects on general buildings.However,when the train speed is about 300 km/h,the peak value of ground vibration velocity exceeds the permissible value of office rooms and other public buildings,and when the train speed is about 200 km/h,the peak value of ground vibration velocity exceeds the permissible value of residences.Compared with measured ground vibration value of other high-speed railways,the ground vibration intensity caused by CRH trains running on viaduct of Hu-Ning Intercity Railway is relatively low.