Study on vibration effect of different initiation positions of guide tunnel in multi-arch tunnel
In order to study the vibration effect of different initiation positions of tunneling bore holes,the related experimental research was carried out in the pilot excavation of multi-arch,and the noise reduction of the monitored vibration was carried out based on CEEMDAN-wavelet packet.The results show that:1)Using CEEMDAN-wavelet packet method to de-noise and reconstruct vibration can effectively preserve the true information of vibration;2)Reverse initiation＞intermediate initiation＞forward initiation of particle peak velocity at different initiation positions of bore hole;The range of vibration is forward initiation＞reverse initiation＞intermediate initiation,in which forward initiation is more widely distributed and has multiple peaks,which is beneficial to energy transfer to high frequency;3)The instantaneous energy relation of the cut section is as follows:reverse initiation＞intermediate initiation＞forward initiation by Hilbert transform of the reconstructed vibration;With the wide waveform of reverse initiation and forward initiation,the peak velocity of particle is larger,the vibration waveform of intermediate initiation is narrower,and the peak velocity of particle is smaller;4)Compared with different initiation positions of bore holes,the reverse initiation effect is more uniform,with the best effect.
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