Double-liquid grouting method utilizing water column to stop grout in ultra-deep borehole under mine

Abstract

This invention relates to a double-liquid grouting method utilizing a water column to stop grout in an ultra-deep borehole under a mine and belongs to the field of prevention and control of mine waterhazard. The double-liquid grouting method comprises a step of constructing a water-stopping and grouting drilled hole according to design parameters, a step of judging the exact position of a water storing and guiding channel, a step of estimating the water flow area of the water storing and guiding channel, a step of calculating the designed depth position of the bottom end of a second-stage aperture casing in the drilled hole, a step of lowering the second-stage aperture casing and sealing, a step of connecting and lowering a double-grout grouting pipe, a step of installing a sealing device, a step of performing grouting and water stopping after installation is completed and a step of detaching the double-grout grouting pipe and the sealing device after grouting is completed. The double-liquid grouting method effectively solves the difficult problems of diameter shrinkage and hole wall collapse in the water-sensitive formation section of the drilled hole, the transporting and movingdistance of mixed grout is greatly shortened, and the purpose of injecting double-grout mixed grout into the drilled hole below the mine shaft of any depth, and quickly plugging the water storing andguiding channel for realizing grouting can be achieved and water stopping.

Description

technical field [0001] The invention relates to a double-liquid grouting method for water column stop grouting in an ultra-deep borehole underground in a mine, and belongs to the field of mine water disaster prevention and control. Background technique [0002] Water damage has always been one of the major geological disasters that seriously affect mine production safety and threaten the life safety of operators. Grouting water blocking is an important means of controlling mine water hazards. After the water gushes out of the mine, it is generally necessary to carry out grouting through the underground drilling of the mine, and inject grout into the karst (crack) and the water storage channel in the gushing water source stratum for sealing, so as to achieve the purpose of grouting and water blocking. However, when grouting is carried out using the commonly used two-liquid mixing method at the orifice, when the borehole length exceeds 100m, the mixed grout needs to migrate a...

AI Technical Summary

Problems solved by technology

Because the double-fluid grout cannot be poured safely and smoothly, only a single-fluid slurry can be injected through the drill hole. The single-fluid slurry that enters the water-guiding crack is quickly washed away and diluted by the high-pressure dynamic water in the storage water-guiding channel, resulting in poor grouting effect , the construction period is long, and the project cost seriously exceeds the budget and other adverse consequences

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