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

引用

International Journal of Mining Science and Technology 2023年第9期33卷 1165-1179页

作者： Hao Zhang Yuanping Cheng Cunbao Deng Jingyu Jiang Lei Zhang Xiaoyu Yan Junwei Guo Suifang Wang College of Safety&Emergency Management Engineering Taiyuan University of TechnologyTaiyuan 030024China Datong Coal Mine Group Co. LtdDatong 037037China Key Laboratory of Coal Methane and Fire Control Ministry of EducationChina University of Mining and TechnologyXuzhou 221116China National Engineering Research Center for Coal and Gas Control China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China

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

关键词： Hydraulic flushing stress-unloading Plastic failure Permeability-increasing Gas migration

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