瓦斯压力对含水合物煤体渗透率及滑脱效应影响研究

doi:10.13722/j.cnki.jrme.2023.0011

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Abstract To evaluate impacts of gas pressure on permeability and slippage effect of gas hydrate bearing coal，the permeability was measured for gas hydrate bearing coal under different gas hydrate saturations，particle sizes and gas pressures，by using triaxial testing machine for coupling action of stress，seepage and chemical effect. Then，the relationship between the gas hydrate saturation and the slippage effect was quantified by combining with the secondary permeability correction equation. Furthermore，the slippage effect was quantitatively evaluated on the permeability. The results show that：(1) The permeability of gas hydrate bearing coal exponentially decreases with the increase of the gas pressure with a reduction between 14.6% and 66.4%，and the permeability variation can be divided into two stages，including accelerated decrease stage and stable variation stage. (2) The permeability change rate and the gas pressure sensitivity coefficient are introduced to evaluate the sensitivity of the permeability of gas hydrate bearing coal to the gas pressure. The permeability change rate and the gas pressure sensitivity coefficient respectively increase and decrease rapidly with the increase of the gas pressure，if the gas pressure is less than 1.50 or 1.625 MPa，indicating that the sensitivity of the gas pressure is significant. (3) The hydrate saturation has significant influence on the slippage effect and the slippage factor decreases with the increase of the hydrate saturation. (4) The influence rate of the slippage effect on the permeability of the gas hydrate bearing coal ranges from 30.1% to 98.2%，and the influence rate of the slippage effect exponentially decreases with the increase of the gas pressure. The results can provide experimental reference for hydrate method application in coal and gas outburst prevention.

Key words： mining engineering coal and gas outburst gas hydrate bearing coal permeability gas pressure slippage effect

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	ZHANG Baoyong1
	ZHAO Guojian1
	GAO Xia2
	WU Qiang1
	ZHANG Xuhui3

Cite this article:

ZHANG Baoyong1,ZHAO Guojian1,GAO Xia2, et al. Experimental study on influence of gas pressure on permeability and slippage effect of gas hydrate bearing coal[J]. , 2023, 42(11): 2655-2667.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0011 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I11/2655

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