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Induced drill-spray during hydraulic slotting of a coal seam and its influence on gas extraction

International Journal of Mining Science and Technology 2012年第6期22卷 785-791页

作者： Shen Chunming Lin Baiquan Zhang Qizhi Yang Wei Zhang Lianjun School of Safety Engineering China University of Mining & Technology Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines Hunan University of Science and Technology

Hydraulic slotting can induce drill spray in a gassy,low permeability coal *** then influences subsequent gas *** paper describes the drill spray phenomenon from a mechanical perspective and analyzes the effects of water jet damage during slotting.A simulation of the stresses around the drill hole and slot was prepared using FLAC-3D *** helps explain the induction of drill spray during hydraulic *** stress concentration around the bore increases as the diameter of the hole *** the hole enlarges the variation in stress also increases,which introduces an instability into the *** allows easy breaking and removal of the *** of the coal structure by the water jet is the major factor causing drill *** stored as either strain or gas pressure is released by the water jet and this causes the coal to fracture and be expelled from the *** tests showed the effect on gas extraction after slotting with drill *** concentration of gas increases after *** to conventional techniques,the hydraulic slotted bore gives a gas concentration three times higher and has an effective range twice as *** makes the gas extraction process more efficient and allows reduced construction effort.

关键词： Slotted drill-spray Water jet Pressure relief and permeability increase Gas extraction

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