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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