Study on Stratum Vibration Transfer CharacteristicBased on the Pulse Experiment inside tunnel

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (8) : 162-165.

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Study on Stratum Vibration Transfer CharacteristicBased on the Pulse Experiment inside tunnel

Wang Wenbin 1, Liu Weining 2, Sun Ning 2, Li Kefei 1, Nie Zhili 2

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Abstract

At present, there is no systematic research on the transfer characteristic of stratum vibration induced by the metro operation. The stratum vibration transfer characteristic tests were carried out in the Lab. of Track Vibration Abatement﹠Control, by using of the automatic falling weight system to hammer the underground track. The propagation attenuation characteristic of vibration accelerations in the ground were studied in the frequency range of 0 ~ 200 Hz. The results indicate: (1) the attenuation rate of the acceleration peak value from the tunnel to the ground can reach 80% and the layers have the strong attenuation function; (2) the transfer function amplitude of the vibration responses from the tunnel to the ground is less than 0.4, except that the transfer function amplitude in the near 30Hz frequency band is greater than 1. (3) 1/3 octave acceleration level transmission loss curve from the tunnel to the ground show the V-shape distribution, the transmission loss is least in the near 30Hz and is a negative number. The vibration acceleration energy from the tunnel to the ground has the transmission amplifier phenomenon at this frequency.

Key words

pulse experiment / automatic falling weight system / transmission loss / vibration transfer function / coherence coefficient

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Wang Wenbin;Liu Weining;Sun Ning;Li Kefei;Nie Zhili . Study on Stratum Vibration Transfer CharacteristicBased on the Pulse Experiment inside tunnel[J]. Journal of Vibration and Shock, 2013, 32(8): 162-165