Gas prevention and control method for gob-side entry self-pressure-relief outburst-elimination rapid tunneling

Abstract

The invention provides a gas prevention and control method for gob-side entry self-pressure-relief outburst-elimination rapid tunneling, and relates to the technical field of mine gas prevention and control. According to the gas prevention and control method, a pressure relief zone area, which is close to a coal body, of a upper section stope face is accurately determined, so that roadway tunneling in the pressure relief zone area is guaranteed; additionally, the outburst of gas of a coal seam on the inner side of a roadway is eliminated, the number of gas extraction drill holes is reduced, the work amount of the drill holes is reduced, the tunneling speed of the outburst coal seam is obviously increased, and the outburst risk in a tunneling process is greatly reduced; in the roadway tunneling process, the range of the pressure relief zone area is further enlarged, the gas extraction concentration and the extraction amount of the gas extraction drill holes are increased to a certain degree, the gas extraction time is shortened, and the gas pressure and content of the coal seam are rapidly reduced; and plugging materials are used for guniting and plugging the coal wall of the outerside of the roadway, and a damaged fracture gas seepage channel is effectively plugged, so that the inrush of goaf gas is reduced, and the concentration of return current gas is prevented from exceeding the limit.

Description

technical field [0001] The invention relates to the technical field of mine gas prevention and control, in particular to a rapid excavation gas prevention and control method for self-relieving pressure and outburst elimination in an adjacent empty roadway. Background technique [0002] Effective outburst elimination in coal seam can not only increase the driving speed of coal roadway, alleviate the contradiction between coal mining and excavation, but more importantly, it can ensure the safety of coal roadway excavation. However, due to the high pressure, high content and low permeability of coal seam gas in outburst coal seams, the amount of outburst elimination engineering is large, and the effect of outburst elimination is not obvious. The orderly connection has become a technical bottleneck restricting the high-efficiency and sustainable development of Gaotu mine. Therefore, how to realize rapid elimination of outbursts in outburst coal seams and increase their tunnelin...

AI Technical Summary

Problems solved by technology

Large-diameter drilling has the advantages of simple process and easy realization, but the pressure relief area of ​​large-diameter drilling is limited, the stress concentration after drilling back is easy to collapse the hole, and the injection hole during drilling is likely to cause the roadway gas to exceed the limit

Due to the high cost and complicated technical process of the hydraulic punching hole creation technology, and the unbalanced distribution of holes due to the anisotropy of the pore-crack structure of the coal body and the fluctuation of the hydraulic pressure, the application of the hydraulic punching hole creation pressure relief technology has been widely accepted. limit

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