Coal mine goaf grouting hole grout-stopping process under deep burying condition of strong confined aquifer

Abstract

The invention discloses a coal mine goaf grouting hole grout-stopping process under the deep burying condition of a strong confined aquifer, specifically comprising the following steps: firstly, forming a hole, drilling the hole with a hole diameter of 130 mm, conducting wall protection on a loose covering layer by adopting mud, drilling a bedrock section by adopting clean water, drilling the bedrock section to penetrate through a position 10 m below the aquifer, and changing the diameter to that of a final hole; after the hole is formed, rapidly putting down a grouting pipe, binding a guide pipe to the outer wall of the grouting pipe, and after the grouting pipe is put down, welding an orifice flange plate to bind to-be-grouted grout; and finally, connecting the grouting pipe through theorifice flange plate for grouting, using clear water for washing the hole for 15 min before grouting and during grouting and hole pouring each time, and finishing grouting when the hole reaches the final hole standard. The method can effectively prevent a large amount of confined water from flowing into a mine through drilled holes to affect underground safety production, and meanwhile, can prevent the confined water from diluting and dispersing slurry.

Description

technical field [0001] The invention belongs to the technical field of goaf grouting, and in particular relates to a technique for stopping grouting in a grouting hole of a coal mine goaf under the condition of deep burial of a strongly pressured aquifer. Background technique [0002] With the rapid development of my country's economy and continuous improvement of infrastructure construction, the shortage of land resources has accelerated. At the same time, the demand for energy is increasing, and the development of minefields is from point to surface, from shallow to deep, and the area of ​​mined-out areas continues to increase. The conflict between the two has led to more and more engineering constructions inevitably encountering goaf foundations, seriously endangering the construction and safe operation of superstructures (structures). With the deep development of mines, the resulting goafs are becoming more and more complex, and the management is becoming more and more ...

AI Technical Summary

Problems solved by technology

After the strongly confined aquifer is penetrated, a large amount of pressurized water flows into the mine through the borehole, which seriously affects underground safety production. At the same time, the pressurized water has the effect of diluting and dispersing the grout, which seriously affects the quality of filling and grouting in the mined-out area.

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