定向聚能爆破弱化综掘工作面逆断层应用研究

doi:10.13722/j.cnki.jrme.2018.1447

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Abstract Aiming at the stability problems of the surrounding rock of roadways and the coal-rock in the tectonic area resulted from ordinary blasting in the reverse fault of the comprehensive excavation face，the coal and gas outbursts caused by blasting disturbance in the reverse fault structural zone were studied through theoretical analysis and comparison simulation experiments. Prevention measures such as changing the charge structure and using the directional cumulative blasting were proposed and applied in practice. It was found that the transmission and reflection of the blasting stress wave occur at the interface of coal and rock when the blasting stress wave propagates to the reverse fault structure area. The cumulative damage of blasting vibration causes the most serious damage to the interface of different coal and rock media，enlarges the damage degree and scope of coal and rock and provides a weak surface for the occurrence of coal and gas outburst even gas dynamic disasters. Directional cumulative blasting can concentrate the blasting action in the direction of rock and reduce the disturbance of the stress wave to the coal-rock in the structural area. Under the experimental conditions，the stresses in the energy accumulation and non-accumulation directions are respectively about 2 times and one third of those of ordinary blasting. The field application of directional accurately cumulative blasting in crossing hard rock faults in fully mechanized excavation face shows that，after blasting，the crack damage expands in the hard rock of the working face which meets the purpose of pre-weakening and the requirement of the rock breaking of the comprehensive excavator，and the coal-rock in the reverse fault structure area above the working face is basically complete which provides a guarantee for safe and rapid crossing the hard rock reverse faults in fully mechanized excavation face.

Key words： mining engineering coal and gas outburst blasting stress wave geological structure belt reverse fault directional cumulative blasting

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	Articles by authors
	GAO Kui1
	2
	LIU Zegong1
	2
	LIU Jian1
	2
	ZHU Feihao1
	QIAO Guodong1
	ZHANG Shuchuan1
	2

Cite this article:

GAO Kui1,2,LIU Zegong1, et al. Application research of directional cumulative blasting for weakening reverse faults in fully mechanized excavation face[J]. , 2019, 38(7): 1408-1419.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1447 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I7/1408

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