A method for joint re-mining of extra-thick coal seam stop production line coal pillar

Abstract

The invention discloses a method for united re-mining of a stopping line coal pillar in an extra-thick coal seam. The method comprises the following steps that (1) units of united re-mining are determined, and the positions of a coal pillar united re-mining working surface transport gate roadway and a coal pillar united re-mining working surface track gate roadway are simulated; (2) an original working face goaf is comprehensively detected, and the potential safety hazard is eliminated; (3) a roadway in the advancing direction of the coal pillar united re-mining working surface is excavated onthe upper portion of the stopping line coal pillar in the extra-thick coal seam to serve as a roadway-side stowboard; (4) a coal pillar united re-mining working surface stoping roadway and an auxiliary inclined roadway are excavated to form a complete production system, and the coal pillar united re-mining working surface is arranged; (5) drilling is conducted on a roadway bottom plate, and a filling pipeline is arranged; (6) filling paste is prepared and evenly injected into the side, close to the original working face goaf, of the transport gate roadway along the filling pipeline; and (7) fully-mechanized caving mining equipment is arranged in an original working surface track gate roadway, and fully-mechanized caving mining is conducted on the coal pillar united re-mining working surface. The coal pressing quantity is reduced, waste is avoided, and economic benefits are increased.

Description

technical field [0001] The invention relates to a method for jointly re-mining a coal pillar of a stop line in an extra-thick coal seam, 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 cost a huge price to carry out secondary extractio...

AI Technical Summary

Problems solved by technology

[0005] (1) Spontaneous combustion of the coal seam on the goaf side: due to the completion of the mining of the extra-thick coal seam working face, there is more residual floating coal on the side of the coal pillar close to the goaf, the floating coal is gradually oxidized, and the tendency of spontaneous combustion increases, which affects the protection Safety Production of Coal Pillar Re-mining in Roadway

[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. In the existing public literature, there is no report on the re-production method

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