Down-explosion and up-extrusion outburst elimination and dust falling method for coal road tunneling in gas outburst coal seam

Abstract

The invention discloses a down-explosion and up-extrusion outburst elimination and dust falling method for coal road tunneling in a gas outburst coal seam. The resonance effect of explosive columns which explode simultaneously in a plurality of horizontal base plate rock drill holes is fully used to enable the coal seam and a rock stratum at the upper side to generate a large amount of fractures, sufficient disturbance and loosening are conducted on the coal seam in the area, the gas extraction efficiency of an extraction drill hole is improved, and accordingly the outburst elimination is achieved; after a large quantity of gas is extracted, the gas pressure is decreased greatly, the resistance of injecting water into the coal seam can greatly be decreased, at this time, a large quantity of water is injected through a water injection pipeline, the water can permeate downwards under the dead weight function, not only is a coal body softened, but also the dust concentration in the tunneling process is reduced, and the working environment is improved. The method is simple in operating and easy to achieve.

Description

technical field [0001] The invention relates to the field of outburst elimination in coal seams, in particular to a method for downburst, upcrowding, outburst elimination and dust reduction in tunneling of gas outburst coal seam coal roadway. Background technique [0002] Most mining areas in my country have entered deep mining. The gas content in deep coal seams increases and the gas pressure in coal seams is higher, which leads to extremely high risks of coal and gas outburst during the mining process. [0003] In order to eliminate the danger of coal seam outburst, gas drainage in coal seam is the fundamental measure to prevent coal and gas outburst. my country's coal and gas outburst coal seams generally have the characteristics of high gas content and low gas permeability, and the gas extraction efficiency is extremely low. In order to extract coal seam gas efficiently, it is essential to take necessary anti-permeation measures, such as mining protection layer, floor r...

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Problems solved by technology

[0004] Coal roadway excavation in coal seam is the premise of working face mining, but it is extremely difficult to carry out coal roadway excavation in outburst coal seam

On the one hand, the air permeability of outburst coal seams is generally low, without the protection of the protective layer and floor roadway, the gas extraction in front of the coal roadway excavation face is extremely difficult, and it is difficult to effectively eliminate the outburst danger of coal roadway; on the other hand, the outburst Coal seams are generally dry and soft, and thick dust is easily generated during the excavation process, which greatly affects the health of personnel

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