Coal face paste-like filling method and slurry-baffling device

Abstract

The invention discloses a coal face paste-like filling method and a slurry-baffling device. The method mainly comprises the following steps: the slurry-baffling device is arranged on a breaking-off prop of a coal face; the traditional filling method is adopted to fill paste-like until the filling height of the paste-like is as high as the height of a slurry-baffling curtain, thus the mined-out region is completely filled; when filling work is finished and the paste-like is semisolid and does not flow, the next cycle of normal coal mining is performed; when one cycle is finished, the slurry-baffling device is recycled, then the breaking-off prop is drawn back; and when the working face reaches a filling interval, the above steps are performed circularly. By using the method of the invention, each filling height of paste-like is increased, the unsupported roof distance of the mined-out region is reduced, the filling effect of the mined-out region is improved, the roof pressure of the working face and the sinking amount of the overlying roadway are reduced, the surface zero subsidence is thoroughly realized, the problems of the flooding accidents of goal water and floor water and the spontaneous combustions of the mined-out region and the hillock are effectively solved.

Description

technical field [0001] The invention relates to coal mining technology, in particular to goaf filling technology. Background technique [0002] The technology related to the present invention is: the working face adopts high-grade general mining technology, the external injection type single pillar and the metal hinged roof beam support the roof, and the double-resistant net is laid on the roof beam, the cycle progress is 0.8 meters, and the "see five times One" support method, that is, when the fifth row of pillars is supported, the last row of pillars is withdrawn, and so on. In order to prevent the roof from sinking in the goaf, the working face paste-like filling technology is adopted, that is, the coal is discharged from the working face for 3-4 cycles, and the gob is filled with the paste-like body. In order to enhance the filling effect of the paste-like filling working face, the working face adopts an inclined mining arrangement, and the cutting holes are arranged a...

AI Technical Summary

Problems solved by technology

When the working face is arranged, if the inclination angle is too large, although the filling effect is good, the coal wall of the machine tunnel is prone to spalling, which will affect the safety of the construction personnel; when the working face is arranged, if the inclination angle is too small, although The possibility of coal wall spalling is small, which is beneficial to the safety of construction personnel, but the filling effect is poor

There are two situations in which the filling effect is poor due to the small inclination angle of the working face: one case is that if the empty roof area of ​​the goaf is kept to the minimum after filling, the paste-like body filled in the gob will spread into the working face, Affect the normal production of the working face in the future; another situation is that after filling, if the paste-like body is not spread into the working face, it will affect the normal production of the working face in the future; another situation is to ensure that the paste-like body does not spread into the working face after filling Like paste, the roof area of ​​the goaf will be large due to insufficient height, which will increase the sinking or collapse of the roof due to the large span, and the filling work will no longer be possible, and the "three-down coal pressing" will not be obtained liberation

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