首页|Stress-unloading and gas migration improvement mechanism in the soft and hard interbedded coal seam using directional hydraulic flushing technology

Stress-unloading and gas migration improvement mechanism in the soft and hard interbedded coal seam using directional hydraulic flushing technology

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To enhance gas drainage in the soft and hard interbedded(SHI)coal seam,it's necessary to unload the in-situ stress and improve its gas migration performance.In this research,a directional hydraulic flushing(DHF)technology was carried out.The stress-unloading and gas migration improvement mechanism was analyzed through numerical simulation,and systematic engineering tests were conducted to verify the gas drainage effect.The results show that the improvement of gas migration performance in the SHI coal seam is caused by a combined effect of seepage-improving and diffusion-improving.After DHF,stress-unloading and plastic failure could be achieved both in the soft coal(SC)sublayer and in the hard coal(HC)sublayer.However,the gas diffusion capacity improves significantly in the SC sublayer,while the gas seepage capacity improves notably in the HC sublayer.Meanwhile,the stress-unloading and gas migration improvement effect improves with the flushing radius and the thickness of the SC sublayer.Besides,after adopting the DHF technology,the gas drainage effect improved markedly.The borehole number dropped by 49％,the gas drainage ratio increased from 26.0％to 48.2％,and the average coal road-way excavation speed increased from 2.4 to 5.6 m/d.

Hydraulic flushingStress-unloadingPlastic failurePermeability-increasingGas migration

Hao Zhang、Yuanping Cheng、Cunbao Deng、Jingyu Jiang、Lei Zhang、Xiaoyu Yan、Junwei Guo、Suifang Wang

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College of Safety & Emergency Management Engineering,Taiyuan University of Technology,Taiyuan 030024,China

Datong Coal Mine Group Co.,Ltd,Datong 037037,China

Key Laboratory of Coal Methane and Fire Control,Ministry of Education,China University of Mining and Technology,Xuzhou 221116,China

National Engineering Research Center for Coal and Gas Control,China University of Mining and Technology,Xuzhou 221116,China

School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China

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国家自然科学基金国家自然科学基金国家自然科学基金山西省自然科学基金中国博士后科学基金

521042105217421751874294202103021243502022M710595

2023

10.1016/j.ijmst.2023.07.002

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDEI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(9)
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