Method for preventing and treating separation layer water of top plate of coal face

Abstract

The invention relates to a method for preventing and treating separation layer water of a top plate of a coal face. The method is characterized in that a drainage lane is constructed on a lower side of the coal face in the stoping direction and is at a position a preset distance away from the outer side of a lane; when the distance that a working face advances equals to a preset value of a caving step pitch, a plurality of separation layer water drainage holes are constructed from the drainage lane to a mined out space; orifice pipes are arranged on all the drainage holes, and the outlet water pressure of the pipe openings are detected; when separation layer water is drained through the drainage holes, the working face continues to advance forwards; and according to the indication of outlet water pressure of the pipe openings, the higher the pressure is, the more the drainage holes are, so as to ensure that before the working face advances to the caving step pitch, the outlet water pressure of the pipe openings is not more than 0.2 MPa. After the method provided by the invention is adopted, separation layer water can be drained effectively, so that accidents of damage of separation layer water can be avoided; and meanwhile, stoping of the working face and drainage of the separation layer water do not conflict, so that continuous and safe stoping of the working face can be realized.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a method for preventing and controlling layer-separated water on the roof of a coal mining working face. Background technique [0002] Coal mining is a relatively intense engineering activity, which often causes geological and environmental disasters. Due to the increase of coal mining depth and multi-coal seam mining, a new type of roof water damage—roof delamination water damage began to appear; roof delamination water damage has the characteristics of large instantaneous water volume, no obvious signs of water inrush, and great harm. And draw attention. The key layer theory holds that the overlying rock separation layer mainly appears under each key layer, and the maximum development height of the overlying rock separation layer stops at the main key layer of the overlying rock. The mechanical model of the overlying rock structure above the goaf after coal seam mining is divided i...

AI Technical Summary

Problems solved by technology

However, since the mining area has not been exploited, the separation layer water has not yet formed, the drainage efficiency of the drainage holes is low, and the roadway is occupied, which seriously affects the production efficiency of the mining area

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