Method for blocking hydrogen-sulfide-contained water bursting point on bottom plate in grouting mode

Abstract

The invention provides a method for blocking a hydrogen-sulfide-contained water bursting point on a bottom plate in a grouting mode. The method includes the steps of firstly, carrying out primary hole drilling on the water bursting point, wherein the drilling direction is perpendicularly downward, and the drilling depth is smaller than the thickness M of a water-resisting layer of the bottom plate; secondly, grouting two types of size including cement and water glass into a primarily-drilled hole to conduct rapid grouting blocking, and carrying out secondary hole drilling to the position below the bottom of the water-bearing layer of the bottom plate after the size in the primarily-drilled hole solidifies, wherein the aperture of a secondarily-drilled hole is smaller than that of the primarily-drilled hole, and the drilling direction of the secondary drilling is perpendicularly downward; thirdly, grouting the size formed by clay, quick lime and desulphurization ash into the water-bearing layer, carrying out hole bottom cleaning on the portion, located in the water-resisting layer of the bottom plate, of the secondarily-drilled hole after the secondary grouting is completed, and then conducting cement hole sealing and reinforcing on the cleaned portion of the secondarily-drilled hole; fourthly, blocking a water bursting passageway of the water bursting point.

Description

Technical field: [0001] The invention relates to the field of mine hydrogeology, in particular to a method for plugging hydrogen sulfide water inrush points by floor grouting. Background technique: [0002] There are natural or excavation-induced water-conducting cracks in the bottom plate exposed by the roadway. After the roadway is formed, the water on the bottom plate will gushes out continuously. Some water bodies are near the coal-measure strata, and the sulfur element in the coal-measure strata will slowly hydrolyze in the water to produce hydrogen sulfide. Gas, while hydrogen sulfide is easily soluble in water. With the flooding of the floor, the concentration of hydrogen sulfide in the roadway will increase, which seriously threatens the safety of operators and is corrosive to mining metal instruments. At present, a mixture of cement and other materials is often used to directly block the water inrush point at one time. However, when the water is rich in hydrogen sul...

AI Technical Summary

Problems solved by technology

[0003] 1) The cement-based slurry is not easy to coagulate quickly in the environment of water inrush, and the effective diffusion radius is small, so it cannot complete the effective plugging of the water inrush aquifer

[0004] 2) When grouting, the water inrush point is a broken zone, and it is difficult to guarantee the effect of grouting for one-time grouting, and it is easy to cause grouting, and the grouting pressure cannot be reached

[0005] 3) When the grout contains a certain amount of cement, the aqueous solution of hydrogen sulfide gas is acidic and corrosive to cement. The durability after grouting is poor, and it is easy to cause hydrogen sulfide to escape, and a very small amount of hydrogen sulfide can also harm the human body. healthy

[0006] 4) Cement cannot seal small pores and cracks, so the overall sealing performance is poor after cement sealing, which is easy to cause hydrogen sulfide to escape

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