House pillar type cutting and filling method of medium coal seam for controlling movement deformation of overlying rock

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 room-and-pillar filling and mining method for controlling the movement and deformation of an overlying rock layer, which is suitable for coal mining faces with a thickness of more than 2 meters and belongs to the field of coal mining and filling. Background technique [0002] The room-and-pillar mining method is to excavate a coal room with a certain width in the coal seam. The coal rooms are connected by connecting lanes to form approximately rectangular coal pillars. The width of the coal pillars varies from several meters to tens of meters. Mining is carried out in the coal room, and after the coal room is mined, the coal pillars are mined as required. If the coal pillar is left unmined, it is called the room method of coal mining. Because the room-and-pillar mining method is basically similar to the roadway layout of the room-and-pillar mining method, the United States now refers to both methods as the room-and-pillar mi...

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Problems solved by technology

[0005] According to the deficiencies in the prior art above, the technical problem to be solved by the present invention is: to provide a method that can utilize the lithology of the overlying strata and combine the room-and-pillar mining with high water expansion material filling to effectively control the coal seam mining. Movement and deformation of the overlying strata, solving the problems of low mining recovery rate and low safety level of "three-down" coal pressing, and controlling the movement and deformation of the overlying strata. The medium-thick coal seam room-and-pillar filling mining method is especially suitable for thicknesses above 2 meters. coal face

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