Gob-side entry retaining Y-type ventilation goaf top plate pressure relief gas pumping mining method

Abstract

A method to suck pressure relief firedamp along Y-shape ventilating gob roof of the empty tunnel is characterized in that: in the high-firedamp coal mining working-face pressure relief zone along the empty tunnel gob roof, it sucks the stripping and free firedamp from the exploiting and pressure relief layer which gathers in the gob upper part and the ring slit loop through the slit channel formed by the mining influence on the gob upper rock stratum through the dip sucking firedamp bore-hole which are distributed in the pressure relief ring slit loop. The pressure relief ring slit loop locates in the separation layer slit zone above the caving zone on the Y-shape ventilating working-face along the empty tunnel gob roof. The invention resolves the air firedamp overrun in the corner and the return airway on the coal mining working-face basically, realizes the sucking and application of the high density firedamp, improves the resource utilization ratio, exploits the high firedamp coal seam without coal wedges, improves the mine resource recovery and assures the high-efficiency and safe exploitation of the coal mining working-face.

Description

technical field [0001] The invention relates to a method for safe production in coal mines, and more specifically relates to a pressure-relieving gas extraction method for a goaf of a high-gas coal seam coal mining face and a roof overlying rock coal seam. Background technique [0002] Anhui Huainan Mining Area is located in the hinterland of East China and is an important coal energy base in my country. The proven coal seams are all soft, low-permeability and high-gas coal seams, with gas reserves of 592.8 billion m 3 . The mining area is rich in coal resources, and there are many layers of mineable coal seams, which are rich in gas and have poor air permeability. As mining goes deeper, it becomes more and more difficult to control gas. According to statistics, the gas emission in the goaf accounts for more than 60% of the gas emission in the working face. In order to solve the amount of gas exhausted by the wind during the mining of the working face, the Huainan mining ...

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Problems solved by technology

In order to solve the amount of gas exhausted by the wind during the mining of the working face, the Huainan mining area has studied and implemented the high-level drainage technology toward the roof since 1998, which greatly reduces the threat of gas in the coal mining face, but the engineering volume of the high-level drainage roadway or long drilling is large. The cost is high, and the preparatory work is heavy; the effective area of ​​high-level drainage is greatly affected by the structure of the roof overlying rock and the position of the key layer, and the area of ​​reasonable drainage varies greatly, and the layer position is difficult to control, and the effect of gas drainage is difficult to be fully guaranteed

At the same time, the traditional U-shaped ventilation method, because the air leakage in the goaf carries the high-concentration gas in the goaf to the upper corner of the working face and is discharged by the wind flow, no matter whether high-level drilling, buried pipe drainage, or high-level drainage is used, None of them can fundamentally solve the problem of gas overrun and gas accumulation in the upper corner, which affects the safety and efficient production of coal mining face

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