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Stereo type prevention and control method for hard roof rock burst

A rockburst, roof type technology, applied in ground mining, earthwork drilling, underground mining, etc., can solve problems such as unsystematic methods, single pressure relief measures, and insignificant pressure relief effects, and achieve the effect of reducing the possibility

Inactive Publication Date: 2014-08-27
CHINA UNIV OF MINING & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

For hard roof rock burst, the traditional prevention and control methods include coal seam water injection, roof hydraulic fracturing, etc. These methods have certain effects, but the pressure relief measures are single, the method is not systematic, the pressure relief effect is not obvious, and there are certain limitations. outstanding shortcomings

Method used

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  • Stereo type prevention and control method for hard roof rock burst
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  • Stereo type prevention and control method for hard roof rock burst

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with accompanying drawing.

[0019] Concrete steps of the present invention are (1) shock absorption; (2) energy absorption; (3) lower impact:

[0020] (1) The damping principle described: the elastic energy in the coal seam can be changed by the volumetric elastic energy U v , Deformation elastic energy U f and top plate bending elastic energy U w It consists of 3 parts, namely:

[0021] U=U v +U f +U w (1)

[0022] Among them, the bending elastic energy of the top plate U w for:

[0023]

[0024] In the formula:

[0025] M—the bending moment of the roof rock layer above the coal wall;

[0026] —The corners where the roof stratum bends and sinks.

[0027] Therefore, the bending elastic energy during the initial collapse of the roof can be correspondingly obtained as:

[0028] U w = q ...

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Abstract

The invention discloses a stereo type prevention and control method for hard roof rock burst. The method comprises the concrete steps: (1) damping: cutting off a high-level key-layer roof in advance, to reduce a caving step distance; (2) energy absorption: releasing the pressure of a coal layer upper-covered old roof, to reduce a caving step distance; (3) shock reducing: releasing the pressure of a coal body; (4) effect testing: testing a pressure releasing effect of the step (1) by utilizing a microseismic system (1), testing a pressure releasing effect of the step (2) by utilizing an electromagnetic radiation and acoustic emission system, and testing a pressure releasing effect of the step (3) by utilizing a cutting drilling method and a conventional mine pressure observation; and if the pressure releasing effects do not reach desired effects, repeating the corresponding steps until the required pressure releasing effects are reached. Through damping, energy adsorption and shock reduction, and with mutual complement of a plurality of pressure releasing methods, systemic comprehensive full pressure releasing on coal and rock bodies is carried out, and the occurrence possibility of rock burst is reduced.

Description

technical field [0001] The invention relates to a three-dimensional prevention and control method for hard roof type rock burst, which belongs to the technical field of mine protection. Background technique [0002] With the massive mining of coal resources in my country, shallow coal resources have tended to be exhausted. Deep coal resources are the strategic guarantee for my country's main energy in the 21st century. Resources are distributed according to depth. However, with the increase of mining depth, the frequency and intensity of coal mine dynamic disaster—rock burst increase significantly. According to data statistics, the number of rock burst mines in my country has increased sharply and spread all over the major coal mining areas. Rock burst has become one of the main disasters restricting the safe and efficient production of coal mines. Rockburst is a coal mine dynamic disaster caused by the sudden release of a large amount of energy accumulated in the coal and ...

Claims

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Application Information

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IPC IPC(8): E21C41/16
Inventor 陆菜平刘广建刘洋左源耀
Owner CHINA UNIV OF MINING & TECH
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