Method for filling heavy-pitch coal bed goaf

Abstract

The invention discloses a method for filling a heavy-pitch coal bed goaf, comprising the following steps: firstly, arranging a grouting pump and a belt conveyor for transporting gangues in an upper roadway on a heavy-pitch direction long-wall coal face; every time the coal face is forwards pushed for 1.2-1.8m, arranging a grouting pipe on the top plate of a strut at the last row; after the coal face is pushed for 3-5m, stopping pushing; arranging air cushions along the strut at the last row on the whole coal face except the upper roadway; filling a gas to cause the air cushions to expand; communicating the grouting pipe on a goaf top plate sealed by the air cushions with the grouting pump; transporting the gangue to the upper tip of the coal face to cause the gangue to automatically slide to the goaf; after the goaf sealed by the air cushions is filled with the gangues, stopping transporting; then, grouting into the goaf to cause the gangues to be fully cemented; stopping grouting, removing the air cushions, and forwards pushing the coal face; and repeating the above steps until the whole goaf is filled. The method is convenient to operate and simple to construct. After the gangues are filled, the possibility of sinking for the top plate can be lowered, the gangues can be reused, and the cost on processing the gangues is lowered.

Description

technical field [0001] The invention relates to the technical field of goaf filling in underground coal mines, and is especially suitable for working faces with a relatively stable roof and adopting a general mining or high-grade general mining process with steeply inclined coal seams moving toward longwalls. Background technique [0002] "Three-down" coal mining has increasingly become an important part of my country's coal resource mining. Filling mining has broad application prospects in "three down" coal mining, and it is the most effective method to prevent roof sinking and damage, and it is one of the development directions of green mining in coal mines. In addition, coal gangue open-air discharge and surface subsidence damage are the main causes of environmental problems in coal mine production, and are important factors affecting economic development and social stability in mining areas. At present, there is little research on goaf filling technology in steeply incl...

AI Technical Summary

Problems solved by technology

At present, there is little research on goaf filling technology in steeply inclined (above 45°) coal seams, and the general method is to adopt the zonal and inclined coal mining method, and the goaf of the previous working face is recovered at the same time as the next working face is mined. Carry out gangue self-sliding filling, or carry out gangue self-sliding filling at the same time as the mining of this working face, but do not recover the pillars, do not put the roof, the consumption of pillars is relatively large, and the stability of the goaf roof cannot be guaranteed

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