A method of filling coal pillars for roadway protection in the residual mining area of ​​extra-thick coal seam in re-mining

Abstract

The invention discloses a method for filling and re-mining a roadway protection coal pillar in the residual mining area of an extra-thick coal seam. The method comprises the steps that firstly, a roadway parallel to the working face is formed in the upper portion of the roadway protection coal pillar of the extra-thick coal seam to serve as a grouting roadway, and when the working face is advanced to the roadway protection coal pillar, a thick and solid wall is laid on the side, close to a goaf, outside a working face hydraulic bracket rear scraper conveyer, a metal net is arranged on the upper portion of the wall, the side, close to the goaf, of the working face hydraulic bracket rear scraper conveyer is provided with a groove and a steel plate, the working face is continuously advanced through the method that top coal is not caved, and coal cutting is stopped after the rear scraper conveyer completely enters a straight section; at this time, a closed area is formed in the rear portion of the goaf and filled with paste, and the working face can be continuously advanced after filling slurry sufficiently makes contact with the roof; and the process is repeated, re-mining of the mining stopping line coal pillar of the extra-thick coal seam is completed, the recovery rate of coal resources is increased, and waste of the coal resources is greatly reduced. The method is simple in procedure, construction is convenient, and materials can be used at any time during mining.

Description

technical field [0001] The invention relates to a method for filling a roadway protection coal pillar in a residual mining area of ​​a re-mined extra-thick coal seam, and belongs to the technical field of coal mining. Background technique [0002] At present, coal, as an important resource in our country, plays an important role in the development of all walks of life. Coal is a non-renewable resource. While meeting the requirements of various industries for coal resources, we need to increase the recovery rate of coal as much as possible in the process of coal mining and reduce the waste of coal resources, so as to ensure coal resources. effective use. The width of the coal pillar of the roadway (stop production line) directly affects the reliability of the roadway during use, the recovery rate of coal resources and the economic benefits of the enterprise. [0003] In reality, under the influence of geological conditions, roadway layout, production system and other factor...

AI Technical Summary

Problems solved by technology

Aiming at the occurrence characteristics of coal pillar re-mining, the prior art that can be obtained is as the publication number: CN101858216A "a kind of sluggish coal pillar recovery method left by the room type coal mining method" and the publication number is: "a kind of room mining method" CN101839134A The recovery method of the irregular and sluggish coal pillars left over from the conventional coal mining method". Both of these two inventions form a new recovery system between the coal pillars by setting up air curtains, and then use continuous coal mining machines and other equipment to recover the remaining coal pillars. This method not only makes more mining equipment in the working face, but also has many ventilating structures on the working face, many air leakages, and poor ventilation effect; for another example, the "Design Method for Coal Pillar Recovery Scheme in Main Alley" with the publication number of CN105888665A provides a large The design method of the roadway coal pillar recovery scheme, this invention is to carry out mechanical analysis and verification on the preliminary scheme of roadway coal pillar recovery by establishing a three-dimensional calculation model, and then conduct safety analysis, recovery rate and economic benefit analysis, this invention is only Verification of several coal pillar recovery schemes proposed by the mine, without disclosing the actual operation method of coal pillar recovery

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