Field Test and Analysis of Environmental Vibration Caused by Viaduct Rail Transit in Mountainous Cities
The train-operation induced surrounding ground vibrations in the areas adjacent to the viaduct sections of Rail Transit Line 1,line 9 and line 10 of Chongqing,the typical mountainous city,are measured.The ground vertical vibration acceleration data obtained from the test are analyzed in time domain and frequency domain.The research results show that the main frequency distribution areas of the vibration caused by train operation in the elevated section of the same line are basically the same.The main vibration frequencies of line 1,line 9 and line 10 are respectively about 52Hz,25Hz,and 37Hz.With the increase of distance to the lines,the attenuation speed of high-frequency vibration is greater than that of low-frequency vibration.The general trend of the attenuation law of ground vibration caused by trains operation in elevated sections is that the vibration gradually decreases with the increase of distance to the lines,and the vibration attenuates rapidly in the near field.The vibration attenuates gradually outside the range of 15 m from the center of the line.The vibration amplification phenomenon occurs at 12 m away from the center line of Line 9,and the vibration amplification phenomenon occurs at 25 m away from the center line of Line 10.The attenuation trend of vibration caused by rail transit in mountainous cities is different from that in plain cities.The vibration near elevated sections of different lines varies greatly,the vibration source intensities of Line 1,Line 9 and Line 10 are respectively 74.9 dB,53.6 dB and 59.3 dB.The ground vibration caused by train operation in elevated section of line 1 is greater than that of line 10.The vibration of line 9 is the smallest due to the low speed and the adoption of trapezoidal sleeper vibration reduction measures.
vibration and wavemountainous cityrail transitviaductfield test
万方数据
维普
