Sectional cementing grouting filling method for coal mine caving area

Abstract

The invention relates to the technical field of coal mine filling mining, is suitable for a fluidization filling working face of a gangue caving area, and particularly relates to a coal mine caving area segmental cementation grouting filling method which comprises the following steps: constructing a plurality of cementation grouting filling holes and original gangue grouting filling holes in an isolation coal pillar of a goaf of a stope working face; wherein the original gangue grouting filling holes are used for treating gangue normally in a large scale, orifices on one sides, close to the goaf of the stope face, of the plurality of cementation grouting filling holes are correspondingly connected with the flexible film bags, cementation grouting is carried out through the cementation grouting filling holes, and a cementation retaining wall is formed after the flexible film bags are solidified. The caving gangue in the caving area behind the cemented retaining wall also forms a closed isolation area section, the isolation area section and the cemented retaining wall form an isolation wall, filling slurry is prevented from flowing back to the goaf, the problem of disasters such as air leakage of the goaf is solved, and the method is easy and convenient to operate and low in cost and has wide application and popularization prospects.

Description

technical field [0001] The invention relates to the technical field of coal mine filling and mining, and is suitable for fluidized filling working faces in gangue caving areas, in particular to a section cementing grouting filling method in coal mine caving areas. Background technique [0002] As the most important fossil energy in my country, coal is still an important pillar supporting the national economy and industry for a long time now and in the future. In response to the country's call for green development, major coal-producing provinces across the country have successively issued a series of policies and regulations to limit the ground discharge of coal gangue. In the coal industry, we promote gangue backfilling of goafs, reduce gangue discharge, and promote the construction of green mines. The fluidized filling technology in the gangue caving area can effectively deal with the gangue, but in the process of mining and filling, the slurry may spread to the working f...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the slurry in the existing fluidized filling technology of the gangue caving area will diffuse to the mining face and affect the normal production operation of the working face, the present invention provides a segmental cemented grouting filling method in the coal mine caving area, which can be used along with mining The working face is filled with mining to prevent the filling slurry from spreading to the mining face. At the same time, it isolates and fills the caving goaf in sections, which solves the disaster problems such as air leakage in the goaf. This method is easy to operate, low in cost, and has important practical significance. Significance and broad application prospects

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