A goaf filling method for reconstructing broken roof structure in coal pillarless mining

Abstract

The invention relates to a goaf filling method for reconstructing a broken roof structure in mining without coal pillars. The method includes filling preparations for three filling bodies; when preparing for the No. 3 filling body, filling the No. 1 goaf filling pipe Pump the high-salt water gangue cementing material twice; while preparing for the next filling body, start filling the No. 2 goaf filling pipe twice and pump the high-salt water gangue cementing material; Drill a long distance from the area filling pipe to the goaf, start pumping the high-brine fine slurry through the No. 1 gob filling pipe until the high-brine fine slurry is completely filled into the goaf, stop pumping, and clean the pipeline ; Repeat the above steps until the mining of the entire working face is completed. Ensure that the key block B above the goaf retaining does not break, so that the arc-shaped triangular block at the end of the working face extends to the inside of the gob, forming a new O-X breaking shape, ensuring the consistent and slow subsidence of the gob and reducing the danger The extent of the isolation wall.

Description

technical field [0001] The invention belongs to the technical field of goaf filling, and in particular relates to a goaf filling method for reconstructing a broken roof structure in mining without coal pillars. Background technique [0002] At present, with the intensification of mining of mineral resources, the mining of coal resources is gradually developing in a refined, sustainable and green direction. The roadway mining arrangement form of mining has become the most reasonable way of mine selection. In coal pillarless mining, since the wall (narrow coal pillar or roadside filling body) used to isolate the goaf is usually narrow, if the goaf fails to collapse in time, it will inevitably form a stress concentration effect , and then endanger the separation wall, so the goaf should be fully collapsed or uniformly and slowly sink to the greatest extent. Just like the existing collapse form of the roof in coal-pillarless mining, it is the "O-X" fracture form, which will in...

AI Technical Summary

Problems solved by technology

Just like the existing collapse form of the roof in coal-pillarless mining, it is the "O-X" fracture form, which will inevitably lead to the rotation and sinking of the key block B concentrated on the separation wall, thereby endangering the separation wall

Images