Anti-outburst method for coal mine single coal seam protective layer pressure relief and permeability-increasing type sequential layer extraction

Abstract

The invention belongs to the technical field of coal mine gas extraction, and particularly relates to an anti-outburst method for coal mine single coal seam protective layer pressure relief and permeability-increasing type sequential layer extraction, which comprises the following steps of: firstly, carrying out sequential layer drilling construction at the lower part of the coal wall of a tunneland vertical to the coal wall of the tunnel, forming a linear pressure relief drilling hole at the lower part of the coal wall of the tunnel, wherein the influence regions of the adjacent pressure relief drilling holes are connected with each other to form an arched shed effect pressure relief region; then, carrying out the construction of the gas extraction drilling at the upper part of the coalwall of the tunnel. According to the invention, the technical problem of sequential drilling pre-extraction coal seam gas pressure relief is effectively solved, by arranging linear dense pressure relief drilling holes at the lower part of the coal seam, the arched shed effect pressure relief region is generated, the conduction of vertical ground stress in the coal seam is effectively cut down, thecoal stress and gas gravity are redistribute, the air permeability of the coal seam can be well improved, the extraction standard period can be effectively shortened, the treatment practice of the working face can be shortened, the improvement of the gas treatment is enhanced, the safety of the mining of the coal mine can be improved, and the effect and efficiency of gas extraction can be improved.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mines, and in particular relates to a pressure-relief and anti-burst method for a single coal seam protective layer in a coal mine, which is a layer-by-bed drainage and anti-burst method. Background technique [0002] With the rapid increase of mining depth and the continuous improvement of mechanized mining, major disasters such as gas, water damage, and rock bursts in underground coal mines have become more and more serious. In particular, coal and gas outburst accidents have a huge impact on mine safety and production. The neck link of continuous excavation is being produced. How to realize the rapid elimination of outbursts in outburst coal seams and meet the drainage standards, ensure that the gas drainage in the mining area is qualified, and achieve the balance of "four quantities" is an urgent problem to be solved in the coal industry. At present, coal mine outburst prevention...

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Problems solved by technology

[0003] Aiming at the deficiencies in the prior art, the present invention provides a coal mine single coal seam protective layer pressure relief and anti-outburst method, which effectively solves the problem of coal seam gas pressure relief technology for pre-draining coal seam by drilling along the bedding, and relieves coal and gas. Highlight the tense situation of "extraction mining" in mines and improve the air permeability of coal bodies

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