Water catchment prevention and control method for coal-pillar-free goaf

Abstract

The embodiment of the invention relates to the technical field of coal mining water prevention and control, and discloses a coal pillar-free goaf water catchment prevention and control method. Comprising the following steps: S1, determining the position, thickness and height of an isolation wall body without a suspended roof area according to the factors such as mining height, mining depth and roof strength; s2, a water conveying pipe, a short grouting pipe and a long grouting pipe are arranged on the goaf entry retaining side; s3, lagging the working face for 1-2 cycle weighting steps, and injecting coarse aggregate and rapid-hardening slurry from bottom to top through the short grouting pipe until the grouting final pressure is reached to form a rapid-hardening retaining wall; s4, after the quick-setting retaining wall is injected, filling slurry is injected into the long grouting pipe from bottom to top until the final grouting pressure is reached to form a filling partition body, and finally the whole partition wall body is completed; and S5, catchment and drainage of the goaf are carried out. The problems of production interference, even mine flood and the like caused by goaf water collection in the coal-pillar-free mining process are solved on the basis that no suspended roof exists above the wall body and the strength can resist the mine pressure influence.

Description

technical field [0001] The invention relates to a method for preventing and controlling water catchment in a mined-out area without coal pillars, which can prevent the water-collection in the mined-out area from affecting the safe mining of the working face, and at the same time plays the role of reinforcing and stabilizing the roadway without coal pillars. Background technique [0002] At present, many mining areas in my country mainly adopt the full caving method to manage the goaf, resulting in the interconnection of adjacent goaf areas, thus forming a large area of ​​compound goaf. The working face is faced with the technical problem that the water accumulated in the composite goaf will flow into the production working face. While causing the cost of mine drainage to rise, safety production is also threatened. Therefore, water inrush plugging technology methods suitable for various mine conditions have been researched and developed one after another. [0003] Compared w...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a solution to the safe recovery of water collection in the goaf without coal pillars and the safe mining of the working face. Water catchment problem in column mined-out area

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