Characteristics Analysis Of Environmental Vibration Induced By Trains On Bridge Section Of Chen-Mian-Le Passenger Special Railway Line

With the vigorous development of high-speed railway rapid, Environmental problems is still not optimistic. Many environmental problems have been caused seriously. Especially the physical pollution has been caused during the operation of the railway. Especially the environmental vibration. Intercity railway construction because of its characteristics will inevitably be part of the line through the crowd more dense residential area, so now the public pay more attention on high-speed railway environmental vibration problem This paper is in this context, for example, test the environmental vibration induced by trains on bridge section of Chen mian le passenger special railway line. Based on analysis of the research progress vibration theory domestic and foreign what’s about the railway environmental vibration. By monitoring the ground environmental vibration about bridge section of Chen mian le passenger special railway line, further inquiry into the vibration characteristics of the environment about Chen mian passenger special railway line bridge section, which can provide reference data for the study of environmental vibration problem in the future.For Cheng mian le passenger dedicated located in Shuang Liu County, Huang Guan Town Village Pier 59 ground-vibration environment found, obtain the relevant data. Through the analysis of the process curve bridge ground vibration environment, conclude trend caused by train vibration acceleration amplitude; through the analysis of the spectrum curve, obtain the optimum frequency corresponding to the change of the magnitude of vibration acceleration. Simultaneously, through the analysis of different frequencies peak acceleration which changes with distance. Obtain the vibration energy trends at different frequencies. Through the analysis of vibration level of Z and 1/3 octave curves Bridge over ground environmental vibration, summarize its vibration attenuation law, And evaluation the maximum Z vibration level from the centerline of the track 30 meters. The main conclusions are as follows:1. With the increase of the detection distance, the ground environment vibration acceleration trend is nonlinear decreasing generated by When the EMU passing monitoring points,30m away from the source area, decreasing faster, after 30m from the source area, decreasing slowly.2. The maximum vibration acceleration energy which is near the viaduct piers position, later begin to attenuate, In the different frequency range the attenuation law of vibration acceleration is different, high frequency vibration energy is maximum, which attenuated faster with the increase of the distance, Low frequency vibration energy is smaller than high frequency vibration energy in the entire vibration monitoring region, However, the low-frequency vibration damping gently, so primarily affected by low-frequency vibration after the 30m area.3. Most vibration energy is concentrated in the range of 20～80Hz, the basic frequency range won’t change as the change of the monitoring distance.4. Due to the generation of the reflected wave at the boundary of semi-infinite elastic media space when the vibration wave propagation in the process, or resonance occurs when the frequency range approaching other vibration wave, the peak acceleration of each frequency range in different monitoring distance has appeared a vibration acceleration increasing phenomenon.