A method for re-mining extra-thick coal seam to stop mining line coal pillar

Abstract

The invention discloses a method for second mining a mining-stopping line coal column in a super thick coal layer. The method comprises the following steps that (1), positions of a coal column second mining working surface transporting gate trough and a rail gate trough are stimulated; (2) comprehensive probing is conducted on an original working surface goaf area where the super thick coal layer mining-stopping line coal column is located, and potential safety hazard is removed; (3) a roadway in the propelling direction of the coal column second mining working surface is dug at the upper part of the super thick coal layer, and the roadway is filled; (4) a coal column second mining working surface mining returning roadway and a affiliated oblique roadway are dug, so that the coal column second mining working surface mining returning roadway and the affiliated oblique roadway form a completed producing system, and the coal column second mining working surface is arranged; (5) a bottom plate of the roadway is drilled from top to bottom for using as a filled pipeline; (6) filling paste is prepared, the filling paste is evenly injected into one side, close to the original working surface goaf area, of the transporting gate trough along the filled pipeline; and (7) comprehensive mining is conducted on the coal column second mining working surface. According to the method for second mining the mining-stopping line coal column in the super thick coal layer, the compressed coal amount is reduced, waste of coal resources is avoided, the economic benefits of enterprises are improved, and the service life of mines and mining areas is prolonged.

Description

Technical field [0001] The invention relates to a method for re-mining the coal pillars of a stop-mining line in an extra-thick coal seam, and belongs to the technical field of coal mining. Background technique [0002] At present, when more than 45% of my country's annual coal production is the source of thick coal seams, coal resources are often left underground in the form of coal pillars. With the development of the technology of roadway protection without coal pillars 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 on the shutdown line has yet to be solved. [0003] Existing available resources are depleting day by day, and energy demand is becoming more and more tense. As a precious non-renewable resource, if the remaining coal pillars are not mined with the existing roadway layout system, the subsequent secondary mining will cost a huge price, some even ...

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to use the recovery roadway of the original working face as the cut eye of the coal pillar re-mining working face of the extra-thick coal seam production stop line, and add the transportation trough and the track trough of the coal pillar re-mining working face, and then arrange the coal pillar re-mining mining face, realize the re-mining of the coal pillars of the production mine's extra-thick coal seam, so as to solve the serious problem of coal loss of the coal pillars of the production mine

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