Testing and Analysis of Ground Vibration Induced by Heavy-haul Railway Operation

Field test of ground vibration induced by heavy-haul railway operation was conducted.The transverse and vertical velocities of ground vibration at the distance of 7.5m,15m,30m,60m,90m away from the rail were measured respectively.The amplitude and frequency characteristics of the vibration velocity were analyzed,and the vibration source characteristics,propagation characteristics and attenuation laws of the ground vibration induced by the heavy-haul train were obtained.The relation among the axle load,velocity of the train and the vibration was derived.Results show that the vibration components caused by the train have obvious peaks at each measuring point in 5-10Hz frequency range.With the distance from the rail to the measurement point increasing,high frequency components of transverse and vertical velocities decay faster than the low frequency components.The Peak Particle Velocity(PPV) of the ground decays as a power law.At the distances of 7.5-15m,the PPV decays significantly.At the distance of 7.5m,the PPV values of transverse and vertical vibrations are close to each other.At the distances beyond 15m,The PPV of the transverse velocity decays faster than that of the vertical velocity.Vibration velocity increases as the train speed and axle load increasing.