卸压爆破下强冲击危险巷道围岩振动规律试验分析

doi:10.13722/j.cnki.jrme.2015.1133

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Abstract Pressure relief blasting often leads to the damage of the surrounding rock and reduces the efficiency of rockburst controlling because of unreasonable design of the parameters of the blasting. The vibration and damage of surrounding rock of roadway with strong probability of rockburst under pressure relief blasting were studied quantitatively through the in-situ measurement with the portable microseismic detection system PASAT-M combined with the short pre-windowed Fourier transform technique. With increase of the distance between the source and sensor，the dominant frequencies in the mining wall and roof increase monotonically. The blasting dominant frequency in non-mining wall reduces firstly and then increases. The amplitude of blasting wall decays exponentially with the increase of the source distance，and the damage of the surrounding rock is very weak over 20 m range. Because of the different influence of surface wave and body wave，the differences of the vibration characteristics(type，dominant frequency and amplitude) of the surrounding rock are different. Vibration types, dominant frequency and amplitude of at different positions of the surrounding rock of the tunnel were not consistent with each other，so damage effect of the blasting vibration wave is very different from place to place. Based on different failure patterns，suggestions were proposed to prevent the roadway from damage by controlling amplitude，dominant frequency band and duration of vibration. In addition，the impact resistance performances of structure should be improved.

Key words： rock mechanics roadway with strong probability of rockburst pressure relief blasting PASAT-M portable microseismic detector vibration damage

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	Articles by authors
	LIU Shaohong1
	2
	FENG Meihua1
	2
	PAN Junfeng1
	2
	WANG Shuwen1
	2

Cite this article:

LIU Shaohong1,2,FENG Meihua1, et al. Experimental analysis on vibration of roadway with strong probability of rockburst subjected to pressure relief blasting#br#[J]. , 2016, 35(5): 906-918.

URL:

http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1133 OR http://www.rockmech.org/EN/Y2016/V35/I5/906

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