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

Abstract

The invention belongs to the field of coal cutting and filling, in particular to a house pillar type cutting and filling method of the medium coal seam for controlling the movement deformation of the overlying rock, which is suitable for the coal face with the coal seam thickness more than 2 meters. The method comprises the following steps: determining the initial weighting interval L and the periodic weighting interval M of the main roof according to the main roof initial weighting interval theory; arranging the rooms and the coal pillars at intervals; and using the material with high expansibility in water during the filling according to the method comprising the following steps of mining the rooms, filling the empty rooms, mining the coal pillars and filling the empty zones of the coal pillars. The method provided by the invention can determine the most economical filling ratio through controlling the key layer to maximize the benefits; the method provided by the invention can control the movement deformation of the overlying rock absolutely within the allowed range when realizing the pulling without pillars, and realize the extremely small gentle uniform sinking of the ground; and the method provided by the invention can realize the mining of the coal resource with high recovery rate under any condition by using the material with high expansibility in water, and greatly enhance the security of coal face. When the rooms are mined, a plurality of coal face of rooms can be arranged at intervals to enhance the working efficiency.

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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