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A method of layered paste filling the coal pillar of the stop production line in the residual mining area of ​​the re-mined extra-thick coal seam

A technology of extra-thick coal seam and paste filling, which is applied in the direction of filling, ground mining, mining equipment, etc., can solve the problems of affecting the safe production of coal pillars and increasing the tendency of spontaneous combustion, so as to reduce the tunneling rate, reduce waste, prevent Effects of security incidents

Active Publication Date: 2019-10-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Spontaneous combustion of the coal seam on the side of the coal pillar passing through the goaf: due to the completion of the mining of the ultra-thick coal seam working face, there is more residual floating coal on the side of the coal pillar close to the gob, the floating coal is gradually oxidized, and the tendency of spontaneous combustion increases. Affecting the safe production of coal pillar re-mining in roadway protection
[0006] (2) Gas accumulation on the side of the coal pillar close to the goaf: due to the completion of mining in the working face of the extra-thick coal seam and the closure of the gob, the back of the goaf is naturally collapsed and re-compacted by the roof, making the coal pillar close to the goaf A large amount of gas accumulates on one side of the area, which affects the safe production of coal pillar re-mining in the roadway
However, due to the particularity of the coal pillars of the stop production line, there are still some technical difficulties in the re-production of the coal pillars of the existing extra-thick coal seams.

Method used

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  • A method of layered paste filling the coal pillar of the stop production line in the residual mining area of ​​the re-mined extra-thick coal seam
  • A method of layered paste filling the coal pillar of the stop production line in the residual mining area of ​​the re-mined extra-thick coal seam
  • A method of layered paste filling the coal pillar of the stop production line in the residual mining area of ​​the re-mined extra-thick coal seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, the average thickness of the coal seam in a certain mine is 8.35m, and the average inclination angle of the coal seam is 3°. According to the thickness of the coal seam, the coal pillar of the extra-thick coal seam shutdown line is divided into two layers, which are respectively recorded as Ⅰ, Ⅱ, and No. Ⅰ layered coal seam from bottom to top The thickness is 4.5m, and the thickness of No. Ⅱ layered coal seam is 3.85m.

[0042] Figure 2~Figure 4 yes figure 1 The cross-sectional diagram in the figure further illustrates the layout of the re-mining roadway.

[0043] The volume of accumulated water and the amount of gas accumulated in the goaf 10 of the original working face were detected. In order to prevent water inrush accidents in the mining roadway, the goaf of the original working face should be drained; in order to prevent gas outburst and coal seam spontaneous combustion, nitrogen and flame retardant should be injected into the goaf o...

Embodiment 2

[0051] Such as Figure 5 As shown, the average thickness of a coal seam in a certain mine is 13.76m, and the average inclination angle of the coal seam is 3°. According to the degree of the coal seam, the coal pillar of the extra-thick coal seam shutdown line is divided into 3 layers, which are respectively recorded as Ⅰ, Ⅱ, Ⅲ, and Ⅰ from bottom to top. The thickness of the seam coal seam is 5m, the thickness of the No. 2 seam is 5m, and the thickness of the No. 3 seam is 3.76m. The layered roadway is arranged in an internal staggered manner as a whole, the internal stagger distance between No. 3 layer and No. 1 layer is about 8-10m, and the internal stagger distance between No. 2 layer and No. 1 layer is about 3-5m. The order of recovery is layered recovery from top to bottom, and other steps are the same as in the previous embodiment.

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Abstract

The invention discloses a method for repeated-mining a stopping-line coal pillar in an extra-thick coal seam residual mining area and filling an extra-thick coal seam with layered pasty fluid. The method for repeated-mining the stopping-line coal pillar in the extra-thick coal seam residual mining area and filling the extra-thick coal seam with the layered pasty fluid comprises the steps that 1, the thickness of an extra-thick coal seam is determined according to mine data, and the mining thickness of each separated layer is determined; 2, comprehensive detection is conducted on an original working face gob, and existing potential safety hazards are eliminated; 3, roadway tunneling is conducted on a layered coal seam of the upper portion of the stopping-line coal pillar of the extra-thick coal seam; 4, the end of an original mining roadway of the extra-thick coal seam is blocked off; and 5, mining with filling is conducted on each layered coal seam. According to the method for repeated-mining the stopping-line coal pillar in the extra-thick coal seam residual mining area and filling the extra-thick coal seam with the layered pasty fluid, the amount of pressed coal of the stopping-line coal pillar of the extra-thick coal seam is reduced, waste of coal resources is reduced, and the potential of the coal resources is fully released; and the economic benefits of coal enterprises are improved, the resource pressure of the coal enterprises is relieved, and the lives of a mine and a mine lot are prolonged.

Description

technical field [0001] The invention relates to a method for filling a coal pillar of a non-production line in a residual mining area of ​​an extra-thick coal seam with layered paste, and belongs to the technical field of coal mining. Background technique [0002] At present, more than 45% of my country's annual coal production comes from thick coal seams, and coal resources are often left underground in the form of coal pillars. With the development of coal pillar-free roadway protection technology in recent years, the problem of serious coal loss caused by section coal pillars has been effectively solved, but the problem of serious coal loss caused by coal pillars in stop production lines has yet to be resolved. [0003] Existing available resources are depleting day by day, energy demand is becoming more and more tense, coal is a valuable non-renewable resource, if the remaining coal pillars are extracted without the help of the existing roadway layout system, it will cos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21F15/00
Inventor 冯国瑞任玉琦郭军白锦文戚庭野张玉江王贵文李振杜献杰崔家庆康立勋
Owner TAIYUAN UNIV OF TECH
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