Analysis Of Attenuation Characteristics Of Environmental Vibration From Zhengzhou-Xi'an High-Speed Railway

In the context of urbanization and advocating energy saving, high-speed railway is fovored by the people as a convenient means of transport with its fast and efficient energy-saving advantages, especially in the areas of large population density, this transport is a green transportation with better prospect and has more competitive. However, with the rapid development of high-speed railway and the improvement of train speed, the problem that environmental vibration induced by high-speed railways operation become increasingly widespread and serious. There are analyzing the attenuation characteristic of environment vibration induced by the train moving on Zhengzhou-Xi'an high-speed railway.It is a basic work that analyze the attenuation of vibration to solve the environment vibration problem induced high-speed railway. Studing on the attenuation of vibration by measuring Zhengzhou-Xi'an high-speed rail which had operated of Loess region. There are selecting 3 route forms which are viaduct, cutting, and the transition section of subgrade and bridge, and measuring the vibration with different distances from the vibration source.It can be seen that the peak values of vibration decreases gradually with the distance increasing from the changes of every form. Specifically, the viaduc section environmental vibration has attenuated lager in the frist 20 meters away from the vibration source and then the attenuation trend become slow; the vibration has fluctuated significantly in the area of 12.5～27.5 m from the vibration source, and the area appears rebound vibration; the vertical vibration show rapidly decreasing trend with the increase of the distance to the vibration source. Cutting section, the vertical vibration presented a more regular attenuating trend when the train is passing through in 300 km/h speed, and the decay curve is smooth without vibration amplification. When the train is passing through in 110 km/h speed, it shows a clear fluctuation in the first 30 meters away from the vibration source, then the vibration shows a decreasing trend after 30 meters. There are almost no vibration attenuation when it is away from the vibration source 40～60 meters. In the transition section of subgrade and bridge, the vibration also decay rapidly when the first 30 meters from the vibration source and it shows fluctuation when in the middle section of 29.5-39.5m from the vibration source. The transition section vibration shows a fluctuating decay trend.