Advance grouting transformation method of bottom plate combination directional holes of deeply-buried aquifers underground coal mine

Abstract

The invention relates to an advance grouting transformation method of bottom plate combination directional holes of deeply-buried aquifers underground a coal mine. The advance grouting transformationmethod includes the steps that the bottom plate combination directional holes are constructed, and comprise deflecting hole sections entering the aquifers from aquicludes and horizontal hole sectionsstarting from the deflecting hole sections and extending inside the aquifers; jet hole sections penetrating through one or more of the aquifers in an extending mode are constructed on the side walls of the deflecting hole sections at the preset interval, and the jet hole sections do not intersect with the horizontal hole sections in the aquifers and cover blind areas of the horizontal hole sections; and grouting is conducted on the horizontal hole sections and the jet hole sections to transform aquifer bottom plates into aquiclude bottom plates. According to the advance grouting transformationmethod, the problems that the distance from a coal seam is large, the number of the aquifers is large, the treatment effect of the coal seam bottom plates with the high water pressure is poor, the blind areas are prone to existing are solved, the advantages that the grouting covering area is wide, no blind area exists in treatment, and efficiency is high are achieved, advance area grouting transformation of the bottom plates of the multiple deeply-buried aquifers is achieved, and the technical guarantee is provided for safe stoping of a working face.

Description

technical field [0001] The invention relates to a grouting reconstruction method, which belongs to the field of coal mine water disaster prevention and control, in particular to a method for advance grouting reconstruction with combined directional holes in the deep buried aquifer bottom plate of a coal mine. Background technique [0002] Water damage is one of the five major natural disasters in coal mines in my country. Floor water damage is one of the main types of coal mine water damage. Its water inrush pressure is high, the flow rate is large, and it is destructive, which brings serious safety hazards to coal mine production. Especially with the gradual development of coal mining to the deep, the pressure of the confined water on the floor, the number of aquifers, the water volume and the buried depth gradually increase, and the threat to the mine is becoming more and more serious. [0003] At present, the methods of drainage and depressurization, under pressure minin...

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Problems solved by technology

[0006] The purpose of the invention is to prevent and control water hazards in deep underground multi-aquifer floors of coal mines, where drainage and pressure reduction are difficult, mining conditions under pressure are not available, conventional grouting reconstruction drilling costs are high, and conventional directional holes are only suitable for single aquifer reconstruction. There are deficiencies such as governance blind areas, and a method for advanced grouting reconstruction of combined directional holes in the bottom plate of deeply buried aquifers in coal mines is provided

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