Control method for coal mine insular coal pillar crossheading rock burst

Abstract

The present invention discloses a control method for coal mine insular coal pillar crossheading rock burst. According to the method, firstly, roadways of a coal mine insular coal pillar are dug and arranged on an upper crossheading, a lower crossheading and a coal face cut; treatments of drilling and blasting distressing are performed on inner side walls of the upper crossheading and the lower crossheading; then, a treatment of interval strong supporting is performed on outer side walls of goaf sides of the upper crossheading and the lower crossheading; finally, a treatment of grouting is applied on the inner side walls of the upper crossheading and the lower crossheading to reinforce the support, wherein the upper crossheading and the lower crossheading are subjected to the blasting distressing. With the present invention, the drilling and the blasting distressing are adopted, the ground pressure of the coal pillar is released, such that the coal body with the impact trend is transformed in the coal body with the weak impact trend; the strong supporting is performed for both side walls, such that the strength of the coal body from the coal wall of the roadway to the deep roadway is improved, the protection wall effect is provided for the roadway, and the safeties of the workers are protected.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] The control of rock burst is a world-class problem, and strip coal pillar mining is often accompanied by destructive rock burst. At present, the prevention and control of rockburst in strip coal pillar mining is basically the same as that in conventional working faces, mainly taking measures to relieve danger, including pressure relief by drilling and blasting, pressure relief by drilling, roof blasting, and floor treatment. During the specific implementation of these measures, due to the push and mining of the working face, the implementation period is very unsafe, and the degree of risk relief is not sufficient, which is likely to cause local stress concentration, and the safety guarantee is not sure. When the width of the coal pillar is narrow and the depth of burial is large, when drilling and blasting and pressure relief of the drilling are implemented, dri...

AI Technical Summary

Problems solved by technology

During the specific implementation of these measures, due to the push and mining of the working face, the implementation period is very unsafe, the degree of risk relief is not sufficient, and it is easy to cause local stress concentration, and the safety guarantee is not sure.

When the width of the coal pillar is narrow and the depth of burial is large, it is very difficult to drill when drilling and blasting and pressure relief are implemented, and the effect of relieving danger is poor; it is also difficult to realize the drilling of water injection drilling by implementing the coal seam water injection method

Therefore, the control of rock burst in strip coal pillar mining has not fundamentally reached the degree of complete control so far, and its mining is more dangerous.

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