Method for repeated-mining stopping-line coal pillar in extra-thick coal seam residual mining area and filling extra-thick coal seam with layered pasty fluid

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...

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.

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