On Site Measurement and Evaluation of Environmental Vibration Caused by Ordinary Speed Train Operation

: In order to study the environmental vibration characteristics and evaluation of the saturated soil site in the cold northern region caused by the train, vibration observation was carried out on a saturated soil site in a near railway area of the Harbin-Manzhouli Railway, and the environmental vibration caused by different trains at different operating speeds was analyzed in the time and frequency domains. The observation results were evaluated by using the 1/3 octave vibration acceleration level and the maximum weighted plumb vibration level as evaluation index. The results show that the acceleration decreases with the increase of distance, and the acceleration decreases rapidly from 10 m to 30 m, and slowly after 30 m. The vibration energy of the measurement points at 10 m and 20 m is concentrated in 15 - 60 Hz, and the vibration energy of the measurement points after 30 m is concentrated in 15 - 20 Hz. With the increase of the distance from the center of the track, the 1/3 octave vibration acceleration level and the maximum weighted plumb vibration level all show a trend of attenuation. The maximum weighted plumb vibration levels at 30 m are 70.8 dB and 71.3 dB for upward and downward trains, and 77.4 dB and 71.4 dB for upward and downward freight trains, respectively, which are greater than the weighted plumb vibration level limit for special residential buildings. The maximum value of vibration acceleration level at the 10 m measurement point is 88.6 dB, which exceeds the limit by 9.5 dB, and that of 30 m measurement point is 69.8 dB, which meets the specification requirements. The results of the study can provide basic data for the environmental vibration characterization of saturated soil sites caused by train operation and the environmental vibration design of residential, agricultural and water conservancy infrastructures in the near-railway area.