水力切槽高瓦斯煤体失稳发生机制与试验分析

doi:10.13722/j.cnki.jrme.2019.0177

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Abstract In order to research the mechanism of coal and gas outburst from boreholes induced by the water jet technique for enhancing coal permeability，theoretical analysis of coal mass instability conditions and single factor test in underground field were carried out，and coal rock electromagnetic radiations(EMR) and gas emissions from boreholes were monitored based on the hydraulic slotting technique in high-gas coal seams. The action mechanisms of in-situ stresses and gas pressure on coal mass instability with hydraulic slotting and their influence characteristics were demonstrated. The results show that slotting expansion can enhance the effect of in-situ stresses and gas gradient force around the borehole and that the minimum critical pressure value of the water jet with enough impacting time is needed for the coal body to outburst in the borehole. It is also shown that the flow pressure of water jet has a linear positive correlation with the weight of coal debris discharged from boreholes while a linear negative correlation with the time of initial outburst occurring. Decreasing of the gas pressure around the borehole would weak the effect of coal mass instability ejection. The phenomena that the coal and rock EMR signal fluctuates sharply during the unstable ejection and the EMR energy level decreases after slotting reflect the instability influenced by the in-situ stress，and the phenomenon that the instantaneous gas emission from the gas pre-discharge borehole decreases obviously after slotting reflects the instability influenced by the gas pressure. The research conclusions provide a reference for the prevention and control of borehole ejection in the application of hydraulic slotting technology.

Key words： mining engineering hydraulic slotting instable spraying borehole electromagnetic radiation gas emission

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	Articles by authors
	SHEN Chunming1
	2
	3
	LIN Baiquan3
	WANG Weihua2
	ZHANG Huijie2
	HAN Lei4

Cite this article:

SHEN Chunming1,2,3, et al. Field test analysis of instability mechanisms of high gas coal seams induced by hydraulic slotting[J]. , 2019, 38(10): 1979-1988.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0177 OR http://www.rockmech.org/EN/Y2019/V38/I10/1979

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