Method for preventing and controlling compression type rock burst of coal pillar

Abstract

The invention discloses a method for preventing and controlling compression type rock burst of a coal pillar, relates to the technical field of coal mining, and mainly aims to reduce the concentrationdegree of high stress in the coal pillar, reduce and even eliminate the hidden danger of severe rock burst caused by high stress of the coal pillar, reduce the anti-impact work amount and reduce theanti-impact cost. The method comprises the following steps: determining a lateral high-stress concentration area of the coal pillar; constructing a coal seam pressure relief hole in the coal pillar ofa first roadway along a second roadway according to a preset depression angle by adopting a drilling machine until the coal seam pressure relief hole penetrates through the coal pillar; withdrawing adrill rod of the drilling machine to the initial point position of the high-stress concentration area, carrying out cutting while withdrawing the drill rod on the pressure relief hole of the coal beduntil the drill rod withdraws to the final position of the high-stress concentration area, so as to perform reaming and slotting on the high-stress concentration area, and forming a cavity with the diameter far larger than that of the pressure relief hole of the coal bed in the high-stress concentration area, wherein the cavity is used for releasing the stress of the coal pillar to achieve the purpose of preventing 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 ...

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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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