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.