Room-pillar-like type coal mining method for filling near goafs through roof cutting

Abstract

The invention discloses a room-pillar-like type coal mining method for filling near goafs through roof cutting. The direct roof initial caving pace L0 is obtained, and when footage of the coal miningprogress reaches one third of the initial caving pace L0, roof cutting is started from the position located behind a coal cutter by the distance of one basic unit; corresponding shot holes are formedin the roof cutting part of the corresponding basic unit, when the footage of the coal mining progress reaches two thirds of the initial caving pace L0, the roof cutting parts on the left side of thebasic unit are cut, and gangue produced at the three roof cutting parts are transferred to filling areas of the basic unit by mechanical equipment for filling; and the steps are repeatedly operated until coal mining of the coal mining area is completed. According to the room-pillar-like type coal mining method for filling the near goafs through roof cutting, the effect similar to that of room-pillar type coal mining is achieved finally, surface subsidence can be effectively controlled, and the sedimentation reduction effect is obvious; no external filling materials are required, only the costof the mechanical equipment is input at a time, and filling cost is reduced; and the room-pillar-like type coal mining method is not limited by slow solidification of paste materials, the supporting effect is achieved once filling is completed, and filling efficiency is high.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a room-and-pillar type coal mining method for top cutting and filling adjacent goafs. Background technique [0002] At present, coal mine filling mining is the most effective measure to control surface subsidence, increase coal recovery rate, and solve mining problems. However, the current filling mining technology faces three unbalanced problems: [0003] Unbalanced coal mining capacity and filling capacity: With the mechanization of fully-mechanized mining and fully-mechanized caving, the coal mining capacity has increased dramatically. However, the filling capacity is limited by the slow solidification of filling materials and it is difficult to achieve breakthrough growth. [0004] Unbalanced supply and demand of filling materials: the proportion of industrial waste in coal mines is very small relative to the amount of coal mined, and it is difficult to meet all or ...

AI Technical Summary

Problems solved by technology

[0003] Unbalanced coal mining capacity and filling capacity: With the mechanization of fully mechanized mining and fully mechanized caving, the coal mining capacity has increased dramatically, but the filling capacity is limited by the slow solidification of filling materials and it is difficult to achieve breakthrough growth

[0004] Unbalanced supply and demand of filling materials: the proportion of industrial waste in coal mines is very small relative to the amount of coal mined, and it is difficult to meet all or even 50% of partial filling

[0005] Imbalance between filling costs and mining benefits: For coal mines, the main driving force for filling is to avoid conflicts with land relocation and land compensation. irreparable damage to the environment

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