Curtain grouting method for burnt rock water-bearing layer from outcrops to solid coal body fracture surface

Abstract

The invention belongs to the technical field of mine water prevention and control and particularly relates to a curtain grouting method for a burnt rock water-bearing layer from outcrops to a solid coal body fracture surface. The problems that as for an existing method, the grouting scheme is indefinite, grouting pertinence is not high, the outcrops of burnt rock are serious in grout runout, the grouting progress is slow, and the cost is high are solved. A closed curtain wall can be quickly formed, and burnt rock incoming water outside the curtain wall can be effectively intercepted. Accordingto the curtain grouting method provided by the invention, grouting is conducted at 60-80 m sections of suboutcrops of the burnt rock and a solid coal body through cement-fly ash mixed grout; groutingis conducted at 40-60 m sections of edges of the direct outcrops of the burnt rock through cement-water glass double-fluid grout; and grouting is conducted at the middle area between the suboutcrop ends of the burnt rock and the direct outcrops of the burnt rock through cement single-fluid grout. The construction speed is high, the water blocking effect is good, materials can be saved, and the grouting cost is reduced; and during curtain middle section grouting, inward discharging is conducted before outward discharging, working face advanced water drainage is facilitated, and the curtain seepage-proof effect is improved.

Description

technical field [0001] The invention belongs to the technical field of mine water prevention and control, and in particular relates to a curtain grouting method for a burnt rock aquifer from an outcrop to a solid coal body section. Background technique [0002] Coal seam burning rock phenomenon exists in Northwest my country. For example, in some places in Xinjiang and northern Shaanxi mining areas, due to the shallow outcropping of coal seams and the development of surface ravines, the coal seams will burn inward after spontaneous combustion in the exposed parts after the ravine cutting, forming a burning area. After the coal seam burned and collapsed to form a burning area, the internal fissures of the entire burnt rock are very developed. When there are water bodies such as reservoirs, lakes, rivers or other aquifers around the burnt rock, the fissures of the burned rock will be filled with water and become strongly water-bearing. layer. Most coal seams in the coal-measu...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a curtain grouting method for the burnt rock aquifer from the outcrop to the solid coal body section, in order to solve the problems in the existing methods that the grouting scheme is not clear, the grouting is not targeted, and the burnt rock outcrop runs away. Serious grouting, slow grouting progress, high cost, etc., can quickly form a closed curtain wall, effectively intercepting the burning rock water outside the curtain wall

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