Extraction method for unloading gas in goaf bed separation zone of ultra-long working face

Abstract

The invention discloses an extraction method for unloading gas in a goaf bed separation zone of an ultra-long working face and treating top corner and goaf gas. The method comprises the following steps that an upper gate backstopping tunnel, a middle gate backstopping tunnel and a lower gate backstopping tunnel are arranged for the ultra-long working face to form a 'W'-shaped ventilation system ofupper gate air inlet, lower gate air inlet and middle gate air return; after a high-level extraction drill and a high-level drainage tunnel are arranged at the middle-upper portion in an 'O'-shaped circle of the upper portion of middle gate goaf zone cover rock, backstopping is carried out; the high-level extraction drill and the high-level drainage tunnel are connected to an extraction branch pipe, and the extraction branch pipe is merged into a mine gas extraction utilization system for extraction control. The extraction method can efficiently extract and utilize high-concentration gas in an unloading fissure zone of the goaf bed separation zone, reduce the gas emission amount in the goaf zone of the working face, eradicate working face air return, top corner gas exceeding and goaf zonegas explosion accidents, improve the working face production efficiency and safety and ensure mine safe backstopping.

Description

technical field [0001] The invention belongs to the technical field of goaf gas control, and in particular relates to a gas extraction method for pressure-relieving gas in a goaf ion-layer area of ​​a super-long working face. Background technique [0002] Longtan Mine is a newly built modern mine in Southwest China. In order to increase the output of the working face and achieve high yield and high efficiency, the layout of the working face has been adjusted from the customary 150m incline length of the Huayingshan mining area to 200-240m; the strike length of 600m has been adjusted to 800-1600m , forming a large-reserve fully mechanized mining face mining pattern. The adjustment of thinking has brought certain difficulties to the gas control of the mining face of the mine, especially in the gas control of the goaf and the upper corner, the hidden dangers of production safety are highlighted, and the following problems are mainly exposed: [0003] 1. Due to the increase of ...

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Problems solved by technology

[0003] 1. Due to the increase of the inclination length and strike length of the working face, the area of ​​the goaf will also increase during the mining advancement process. When the roof collapses and the management is not good, it is easy to form a large gas accumulation space;

[0004] 2. Floor fissure gas and overlying K2 coal seam develop in the working face of the south wing of the mine. After mining, under the action of mine pressure, it is easy to conduct high-concentration floor fissure gas and a large number of remaining K2 coal seams in the goaf, which increases the gas gushing in the goaf From the source, the gas gushes out relatively large;

[0005] 3. "U"-shaped ventilation is adopted in the fully mechanized mining face, and the wind path at the upper corner is often in a vortex state, and the ventilation is not smooth, which is easy to cause gas accumulation

If the gas gushing out of the goaf is not properly controlled, it will cause the stoppage of production at the working face, and in severe cases, it may cause a gas explosion accident

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