A kind of gas control method for self-relief pressure and outburst fast excavation in adjacent empty roadway

Abstract

The invention provides a gas control method for self-relief, pressure-relieving and rapid excavation of adjacent empty roadways, and relates to the technical field of mine gas prevention and control. The invention accurately determines the pressure relief zone area adjacent to the coal body in the upper section of the mining working face, so as to ensure roadway excavation in the pressure relief zone area; at the same time, the gas outburst of the coal seam in the roadway is eliminated, the number of gas drainage holes is reduced, and the number of drilling holes is reduced. In the process of tunnel excavation, the area of ​​the pressure relief zone is further increased, and the gas drainage concentration of the gas drainage hole is further increased. Both the gas drainage and gas drainage volume have been improved to a certain extent, the gas drainage time has been reduced, and the gas pressure and content of the coal seam have been rapidly reduced. The channel reduces the influx of gas in the goaf and prevents the gas concentration in the return flow from exceeding the limit.

Description

technical field [0001] The invention relates to the technical field of gas prevention and control in mines, in particular to a method for gas prevention and control of adjacent empty roadways by self-releasing pressure, eliminating outbursts and rapidly excavating. Background technique [0002] The effective elimination of coal seam outburst can not only improve the driving speed of coal roadway, alleviate the contradiction between coal mining and excavation, but also ensure the safety of coal roadway driving. However, due to the high gas pressure, high content and low permeability of coal seam in outburst coal seam, the outburst elimination engineering is large and the outburst elimination effect is not obvious. Orderly connection has become a technical bottleneck restricting the efficient and sustainable development of high outburst mines. Therefore, how to quickly eliminate outbursts in outburst coal seams and improve its excavation speed has become a common concern of s...

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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