WANG D, HAN H K, REN P L,et al.Study on the distribution law of stress and gas in the coal mass on the side of goaf[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(2):42-48.

doi:10.16186/j.cnki.1673-9787.2021080034

Received:2021/08/11

Revised:2021/12/26

Published:2023/03/25

Study on the distribution law of stress and gas in the coal mass on the side of goaf

WANG Di1, HAN Hongkai2,3, REN Peiliang4, LIU Yanwei2,3, ZUO Weiqin2,3, ZHANG Shuai2,3, SHI Can2,3

1.Mengjin Coal Mine Co.，Ltd.，Yima Coal Industry（Group），Luoyang  471142，Henan，China；2.State Key Laboratory Cultivation Base for Gas Geology and Gas Control，Henan Polytechinc University，Jiaozuo  454000，Henan，China；3.School of Safety Science and Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China；4.Yima Coal Industry（Group）Xin’an Yunding Coal Mine Co.，ltd.，Luoyang  471800，Henan，China

Abstract:Mastering the distribution law of stress and gas in the coal mass on the side of goaf is of great guiding significance for predicting the outburst hazard of roadway driving along goaf and preventing outburst accidents.Taking Mengjin coal mine as an example，the relation between stress，permeability and gas distribution law of coal body in the goaf side could be obtained through numerical simulation and field measurement of stress and gas content of the coal mass on the side of goaf.The results showed that the coal body stress and gas content of adjacent goaf decreased significantly，and the longer the goaf was placed，the larger effective gas emission relief range was，and the more unfavorable the occurrence of coal and gas outburst accident was.There is obviously positively correlated between the stress and gas distribution，and the stress relief and plastic failure of the coal resulted in the significant increase of permeability of coal.The wider limit equilibrium zone of coal mass on the side of goaf was，the larger coal body width with increased permeability would be，and the larger the effective gas emission relief range would be.The stress relief zone，limit equilibrium zone and effective gas emission relief range in the coal mass on the side of goaf 12050 were 19.3 m，23.4 m and 28.7 m respectively.The outburst prediction indicators within the effective gas emission relief range were all lower than the critical value.The results could guide the mining practice of preventing coal and gas outburst by driving roadway along goaf of working face 12070.

Key words:roadway driving along goaf;gas field;mining stress;unloading zone;coal and gas outburst

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