Roadway backfill mining method for coal seams with medium-high thickness

Abstract

The invention belongs to the fields of coal mining and filling, and in particular relates to a roadway backfill mining method for coal seams with medium-high thickness. The method comprises the following steps: according to a theory of initial roof caving pace of the coal seams and a principle that a filling roadway is smaller than a reserved empty roadway, respectively determining mining width of the filling roadway and the reserved empty roadway; and sequentially mining and filling the filling roadway and the reserved empty roadway in an excavating manner by utilizing a digging-anchoring machine or a continuous miner: firstly mining the filling roadway, fully filling a goaf of the filling roadway with a fluid expansion material, and then solidifying the obtained filling body until the strength is reached; and then mining the reserved empty roadway, and fully refilling or partially filling or not filling the goaf of the reserved empty roadway according to the requirements for protection class of surface buildings. The roadway backfill mining method has the beneficial effects that surface subsidence caused by coal seam mining can be controlled within the minimum allowable degree, recovery rate of coal mining areas 'under three special conditions' (buildings, water and railways) is improved to over 95%, recovery roadways of the mining areas can be reduced, and direct productioncost is lowered.

Description

technical field [0001] The invention relates to a roadway filling and mining method for medium-thick and above coal seams, which is suitable for coal seams with a thickness of 2 meters and above, and belongs to the field of coal mining and filling. Background technique [0002] For a long time, there have been two general problems in the underground mining of coal resources: one is the degree of control of surface subsidence; the other is the recovery rate of the "three-down" coal mining area; At present, the control methods of surface subsidence are mainly filling method and partial mining method. The current filling methods mainly include water and sand, gangue, paste and similar paste. Although these methods have effectively controlled the surface subsidence caused by coal seam mining, it is difficult to control it to the minimum allowable level. Within and to varying degrees reduce production efficiency. The current partial mining methods mainly include strip type and ...

AI Technical Summary

Problems solved by technology

[0002] For a long time, there have been two general problems in the underground mining of coal resources: one is the degree of control of surface subsidence;

The current filling methods mainly include water and sand, gangue, paste and similar paste. Although these methods have effectively controlled the surface subsidence caused by coal seam mining, it is difficult to control it to the minimum allowable level. within and to varying degrees reduce production efficiency

The current partial mining methods mainly include strip type and room-and-pillar type. Although these methods can control the surface subsidence caused by coal seam mining within the allowable minimum, the recovery rate of the mining area is less than 50%, and more than half Resource reserves are unavailable

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