Tendency progressive outburst elimination roadway arrangement method

Abstract

The invention discloses a tendency progressive outburst elimination roadway arrangement method, 2-5m of coal pillar or no coal pillar is reserved along a gob edge of an upper section, an air return level of the upper section is excavated; bedding drill holes are formed in the air return level to perform gas extraction on a certain area coal seam on the lower portion; after removing outburst hazards, a middle roadway is excavated; bedding drill holes are formed in the middle roadway to perform the gas extraction on a certain area coal seam on the lower portion; after removing the outburst hazards, a haulage way of the section is excavated, open-off cut communicates with the middle roadway and the air return level to form a working face to perform backstopping; and the steps above are repeated until mining of the coal seams of all the sections is completed. The tendency progressive outburst elimination roadway arrangement method has the beneficial effects that by using the gob-side entrydriving technology of the no coal pillar or narrow coal pillar and combining with the middle roadway of the working face, the purpose of effective control cover coal and gas outburst can be achieved,coal and gas outburst prevention work amount is reduced, the effective tilting length of outburst elimination of the working face is ensured, and safe and high efficient production of the working face is realized.

Description

technical field [0001] The invention relates to the fields of coal mining and gas drainage. In particular, it is a method for layout of outburst-reducing roadways with progressive inclines, which is suitable for the mining of protective layers in outburst coal seams. Background technique [0002] Most outburst mines in my country have low coal seam permeability and difficult gas extraction. With the increase of mining depth, coal tunnel outburst dynamic phenomenon occurs from time to time, which affects the tunneling speed of coal tunnel. The danger of coal and gas outburst has seriously restricted the safety production of coal mines. [0003] "Coal Mine Safety Regulations" and "Regulations on Prevention and Control of Coal and Gas Outburst" stipulate that for outburst coal seams, the principle of regional outburst prevention measures must be taken first, that is, the mining of protective layers and pre-pumping of coal seam gas. At present, in the implementation of protecti...

AI Technical Summary

Problems solved by technology

At present, in the implementation of protective layer mining (taking Shengyuan Coal Mine as an example), the coal pillars between the working faces are generally 15-20m. outburst prevention works

For the outburst coal seams mined without protective layers, the pre-extraction of the working face strips is carried out by excavating the floor rock gas drainage roadway. It is not easy to select the rock layer of the layer drilling, and sometimes it is necessary to drill along the bedding for supplementary extraction after drilling through the layer, which directly affects the excavation speed of the transportation and return air entry of the working face, resulting in the production delay of the working face

In the process of mining outburst coal seams, the traditional U-shaped ventilation method of the working face has exceeded the limit of gas in the upper corner, which affects the safe production of the working face

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