Rock burst prevention and control method of three-dimensional coal pillar coal compressing area

Abstract

The invention discloses a rock burst prevention and control method of a three-dimensional coal pillar coal compressing area, and relates to the technical filed of coal mining. A plurality of blastingdrilling groups are formed in a coal wall of a working face, and the high energy level impact energy formed by three-dimensional coal pillars can be blasted by high-strength to form a plurality of low-energy block regions, and the accumulated elastic energy is released to a large extent. The energy block area blocks and eliminates high stress and high energy, reduces the impact risk of a three-dimensional coal pillar area, and realizes the control of high energy level impact energy.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for preventing and controlling rock burst in a three-dimensional coal pillar coal pressing area. Background technique [0002] Under the background of continuous mining of coal resources, coal in shallow and easy-to-mine areas is close to depletion. At present, coal mining has developed to deep and difficult-to-mine areas. With the increase of mining depth and mining intensity, the resulting The problem of rock burst is extremely serious. In the mining stage of the working face, due to various historical reasons such as mining technology limitations, mining environmental impacts, and mining needs, leftover coal pillars of various sizes and areas will be formed. Due to the existence of leftover coal pillars, the stress on the coal pillars and their surrounding areas Abnormal appearance, large degree of energy accumulation, and high risk of rock burst. Especially whe...

AI Technical Summary

Problems solved by technology

In the mining stage of the working face, due to various historical reasons such as mining technology limitations, mining environmental impacts, and mining needs, leftover coal pillars of various sizes and areas will be formed. Due to the existence of leftover coal pillars, the stress on the coal pillars and their surrounding areas Abnormal appearance, large degree of energy accumulation, high risk of rock burst

Especially when there are residual three-dimensional coal pillars in the upper coal seam of the working face, the mining of the lower working face will accumulate a large impact energy due to the superimposed coupling effect of the upper three-dimensional residual coal.

At present, most of the rock burst prevention and control technologies in the coal pillar area are on the same level coal pillars, but the high stress area and energy accumulation degree generated by the three-dimensional coal pillars are much larger than the same level coal pillars, and the stress environment is extremely complex. The anti-scour technology of pillars is difficult to fundamentally prevent and control the rockburst of three-dimensional coal pillars. Therefore, it is necessary to invent a prevention and control method for rockburst in the three-dimensional coal pillar coal pressing area to ensure the safety of the working face. mining

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