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Method for reducing reserved width of waterproof coal pillars of inclined coal seam

A coal pillar and width technology, which is applied in the field of reducing the reserved width of waterproof coal pillars in inclined coal seams, can solve the problems of large reserved width of waterproof coal pillars, etc., and achieves the effects of improving the recovery rate, overcoming repeated calculation, and optimizing the width.

Inactive Publication Date: 2014-01-15
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to provide a method for reducing the width of waterproof coal pillars in inclined coal seams, so as to solve the problem of excessive width of traditional waterproof coal pillars, so as to prevent collapse of adjacent mined-out areas. Under the premise of water, reduce the width of the waterproof coal pillar and increase the recovery rate

Method used

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  • Method for reducing reserved width of waterproof coal pillars of inclined coal seam
  • Method for reducing reserved width of waterproof coal pillars of inclined coal seam
  • Method for reducing reserved width of waterproof coal pillars of inclined coal seam

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Embodiment

[0052] A certain mine is designed to produce 1.2 million tons of mines per year, and the main mining coal seam is 4# coal seam. The average thickness of the coal seam is 6.2m, the inclination angle of the coal seam is 32°, the length of the working face is 150m, and the continuous advance range from the middle of the mine field to the east to the natural boundary is about 2100m. The coal seam structure and geological structure are both simple, and the comprehensive mechanized top-coal caving one-time full-height mining method is adopted. Before the method of the present invention is used for optimization, the two lanes (inlet air lane and return air lane) of the working face are arranged along the coal seam floor , the production practice at the working face that has been recovered shows that the normal water inflow is 5m 3 / min, the maximum water inflow is 8m 3 / min, the vertical height of the working face that has been recovered is 80m, and the water in the goaf of the work...

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Abstract

The invention relates to a method for reducing reserved width of waterproof coal pillars of an inclined coal seam. The work plane employs external-staggered layer-staggered type tunnel layout, the air intake tunnel of the work plane is arranged along the top board of the coal seam, and the air return tunnel is arranged along the bottom board of the coal seam; the angle of the working plane is gradually uplifted to approximate horizontal from downward incline before the work plane approaches the air intake tunnel, and also the exploitation thickness of the work plane is gradually reduced to the height of the air intake tunnel, so that the problem that the reserved width of conventional waterproof coal pillars is too large; and under the prerequisite that adjacent goaves are prevented from water-bursting, the method helps to reduce the reserved width of the waterproof coal pillars and improve recovery rate.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a determination method for reducing the width of a waterproof coal pillar in an inclined coal seam. Background technique [0002] The retention of waterproof coal pillars is an important measure for mine water prevention and control. Its function is to prevent various types of water above the stope from pouring into the roadway or working face. Traditionally, in order to increase the recovery rate, the usual practice is to increase the mining thickness, such as the full height of mining at one time. However, this will also increase the width of the waterproof coal pillar, resulting in waste of resources. In addition, the waterproof coal pillar includes the elastic core area in the middle of the coal pillar and the non-core area on both sides, among which the elastic core area of ​​the coal pillar really plays a waterproof role. At present, the design of waterproof coal pillars in this...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16
Inventor 王志强乔建永赵景礼李刚
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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