Goaf open-type packing method

Abstract

The invention discloses a goaf open-type packing method, comprising the following steps: firstly filling the goaf of initial prefilling top plate span L1 from an open-off cut, stopping filling until the filled high-water material seriflux is contacted with the top plate of the goaf, filling constantly along with forward propulsion of coal mining working face, finishing filling the underfilling area of the initial prefilling top plate span L1 and goaf within the range of top plate span L2; after work surface mining finishes, constructing a plugging wall in work surface conveying inclined alleys and track inclined alleys to tight goaf, filling the underfilling area of ending prefilling top plate span L3 and metaphase prefilling top plate span L2, thereby finishing goaf filling in the last stage, wherein the solidified filling body has the function of supporting the top plate of goafs. The method of the invention is suitable for inclined mining working face of which the coal seam dip angle is more than 12 degrees, and has good filling density; and filling does not influence coal mining, the filling method is simple and has low primary investment and wide practicability, and the primary input of the filling system can be reduced by 90% to 97%.

Description

technical field [0001] The invention relates to an open filling method for a goaf, which is suitable for filling the goaf in an inclined mining face with a coal seam inclination angle above 12°. Background technique [0002] For a long time, after the "three-down" coal mining, the overlying strata and the surface of the goaf are often seriously deformed, which makes the ground buildings unusable and the groundwater system is destroyed. These problems can be solved by filling the goaf. [0003] At present, the goaf filling methods mainly include gangue filling, water-sand filling, paste and paste-like filling, etc. These filling methods play a certain role in controlling the movement of the overlying strata in the goaf. However, the disadvantages of these methods are low filling rate and high cost, especially the mutual influence between the filling process and the coal mining process of the working face, the production efficiency is very low, and the filling process in the...

AI Technical Summary

Problems solved by technology

However, the disadvantages of these methods are low filling rate and high cost, especially the mutual influence between the filling process and the coal mining process of the working face, the production efficiency is very low, and the previous filling process is complicated, and the initial investment is relatively large, ranging from tens of millions of yuan. As many as hundreds of millions of yuan, thus limiting the application and promotion of these filling methods

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