考虑地应力瞬态卸荷低频放大效应的深埋隧洞爆破开挖振动安全评估

doi:10.13722/j.cnki.jrme.2017.0650

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Abstract

During drilling and blasting excavation of deep tunnel，high and low dual-frequency band vibration generated by coupling action of blasting load and transient unloading of in-situ stress will endanger safety of adjacent buildings，but low-frequency amplification effect of transient unloading of in-situ stress is usually ignored in traditional vibration safety evaluation. Firstly，excavation of main underground powerhouse in Pubugou hydropower station as background，vibration spectrum characteristics of hole and adjacent tunnel under coupling action of blasting load and transient unloading were studied by time-energy density，amplitude spectrum and filter analysis method. Then，based on dynamic response analysis of structure，low-frequency amplification effect of transient unloading induced vibration hidden in coupling vibration waveform was discussed. Finally，combined with double index of peak value of particle vibration and vibration frequency，safety of tunnel blasting excavation surrounding rock was evaluated. The results showed that peak value of vibration caused by blasting load is obviously larger than that induced by transient unloading of in-situ stress in hole，distribution law is opposite in adjacent tunnel. Vibration produced by blasting load is mainly high frequency，main frequency range 65–135 Hz，with an average frequency of 96 Hz，but vibration induced by transient unloading is mainly low frequency，main frequency range 20–60 Hz，with an average frequency of 46 Hz. Frequency of transient unloading induced vibration is lower and closer to granite natural frequency of 37 Hz，it is easy to produce resonance，the amplitude magnification reaches 1.72. When in-situ stress level is higher，reaching 70 MPa magnitude，low-frequency amplification effect of transient unloading of in-situ stress results in unsafe zone of surrounding rock expanding significantly from 6.0 m to 20.1 m. The research results can provide a reference for vibration safety evaluation of deep tunnel blasting excavation.

Key words： tunnelling engineering deep tunnel blasting excavation transient unloading spectrum characteristics low-frequency amplification effect safety evaluation

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	Articles by authors
	FAN Yong1
	2
	3
	WANG Fen1
	2
	4
	LU Wenbo3
	WANG Feng1
	2
	HE Weiping1
	2
	YAN Peng3
	LENG Zhendong3

Cite this article:

FAN Yong1,2,3, et al. Safety evaluation of deep tunnel blasting excavation vibration considering low-frequency amplification effect of transient unloading of in-situ stress[J]. , 2018, 37(S2): 4184-4197.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0650 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/4184

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