Methods of Prevention and Control of Coal Pillar Compression Rockburst

Abstract

The invention discloses a method for preventing and controlling coal pillar compression rockburst, which relates to the technical field of coal mining, and the main purpose is to reduce the degree of high stress concentration in the coal pillar, and to reduce or even eliminate the serious impact caused by the high stress of the coal pillar There are hidden dangers of ground pressure, and it can reduce the amount of anti-scouring works and reduce the cost of anti-scouring. The method includes: determining the lateral high stress concentration area of ​​the coal pillar; using a drilling rig to construct a coal seam pressure relief hole according to a preset depression angle in the coal pillar along the direction of the second roadway in the first roadway until the coal seam pressure relief hole penetrates the coal pillar; Return the drill pipe of the drilling rig to the starting point of the high stress concentration area, and perform the operation of withdrawing the drill pipe while cutting the pressure relief hole in the coal seam until the drill pipe is retracted to the termination position of the high stress concentration area, so as to The hole reaming and cutting in the high stress concentration area forms a cavity with a diameter much larger than the pressure relief hole of the coal seam in the high stress concentration area. The cavity is used to release the stress of the coal pillar and prevent the occurrence of rock burst.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for preventing and controlling coal pillar compression rockburst. Background technique [0002] Coal pillar compressive rockburst generally occurs in the roadway, because the surrounding rock in the shallow part of the roadway accumulates a large amount of compressive elastic energy under the action of high stress, and it is a dynamic phenomenon that is released suddenly, sharply and violently under certain conditions. It can instantly release huge energy, causing large-scale damage or even complete closure of the roadway. In addition, it may also induce more serious secondary disasters, such as gas and coal dust explosions, floor water inrush, etc., seriously affecting mine production and personnel safety. [0003] At present, coal pillar compression type rockburst is usually prevented by constructing a large number of pressure relief holes in the coal seam. Part ...

AI Technical Summary

Problems solved by technology

However, the construction of a large number of pressure relief holes in the coal seam not only requires a large amount of work and high investment, but also is limited by the small hole diameter, the pressure relief range is small and the stress is easy to recover, resulting in that even if a large number of coal seam pressure relief holes are constructed, the Rockburst disasters cannot be fundamentally eliminated

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