Research On Environmental Vibration Induced By Trains On Shallow Buried Section Of Tunnel Of Cheng-Mian-Le High Speed Railway

With the continuous development of social economy. High-speed railway stand out competition with other transport industries with its advantages on easier to transfer、lower fares、less traveling time. High-speed railway has become the first choice of people to travel. With the increase of speed and traffic, high-speed railway cause a few environmental problems. Especially the vibration generated by high-speed railway, it has impact on the surrounding living environment. Based on the existed studies of domestic and international rail transportation system vibration and specific circumstances on Cheng-mian-le high-speed railway, this thesis select Cheng-mian-le Shuangliu Airport tunnel shallow section as research subject and measure the environmental vibration at different distances. And compare to the Cheng-mian-le embankment vibration transmission. Then i sum up the discipline in two different road condition.According to the analysis, vertical (Z) and horizontal (X) vibration attenuated with the increasing distance overall when the train through the embankment. When the train through the tunnel shallow section, the first measuring point’s vibration value is smaller than others, because the first measuring point arranged in the gutter edge. Then the vertical (Z) vibration attenuated with the increasing distance overall. Horizontal (X) vibration changes in different ways according to different lines the train run:When the train through the tunnel shallow section by inside line, the horizontal (X) vibration increased with the increasing distance overall; When the train through the tunnel shallow section by outside line, the horizontal (X) vibration increased first then attenuated with the increasing distance overall. Vibration frequency is usually divided into three bands:1-20 Hz low-frequency band,20-50Hz intermediate frequency band,50-125Hz high frequency band. In this test, the measuring point is not far from railway, so the most of the measured frequency concentrated in the range of 50-60Hz, it is belong to high frequency band. And with increasing distance, little change in the frequency range. According to the result, both the Shuangliu Airport tunnel shallow section and the embankment section’s environmental vibration energy mainly between 8-60Hz. At last, analysis the Z and X vibration level and obtain the Shuangliu Airport tunnel shallow section and the embankment section’s empirical formula of environmental vibration transmission...