Method for filling heavy-pitch coal bed goaf

A goaf and steep inclination technology, applied in the fields of backfill, mining equipment, earthwork drilling, etc., can solve the problems of large consumption of pillars, unable to ensure the stability of the roof of the goaf, and not recovering pillars, etc. The effect of preventing sinking damage and reducing costs

Inactive Publication Date: 2011-08-17
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for filling heavy-pitch coal bed goaf
  • Method for filling heavy-pitch coal bed goaf

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Embodiment Construction

[0017] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0018] In the goaf filling method of steeply inclined coal seams of the present invention, firstly, a high-water quick-setting material grouting pump 3 and a belt conveyor 4 for transporting gangue are arranged in the upward trough 1 of the steeply inclined coal seam towards the longwall coal mining face; When the mining face advances 1.2-1.8m forward, along the inclination direction of the working face, on the top plate of the last row of pillars 7, interconnected grouting pipes 5 with a diameter of 1 inch and a length of 3m are successively laid out. Three groups of grouting holes are evenly arranged on the outer diameter of the pipe 5, and each group has four grouting holes, which are arranged symmetrically along the circumferential direction of the grouting pipe. The last row of pillars 7 of the entire mining face outside the tank 1 is arranged successi...

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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...

Claims

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Application Information

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IPC IPC(8): E21F15/06
Inventor 柏建彪陈勇冯伟王襄禹徐营
Owner CHINA UNIV OF MINING & TECH
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