Method for substituting reconstructed gangue bearing body for roadway protection coal post

Abstract

The invention discloses a method for substituting a reconstructed gangue bearing body for a roadway protection coal post, which mainly comprises the following steps: directly crushing the underground gangue in a coal mine underground to form granules of below 5 centimeters, adding common silicate cement into the gangue, mixing the silicate cement and the gangue according to a proportion to form hollow precast blocks, and conveying the hollow precast blocks to a construction site; and when tunneling a roadway along goaf or roadway driving along next goaf, recovering one coal post reserved in the primary design while driving an anchor rod to a top plate of the coal post reserved in the primary design to support the top plate, then piling the precast blocks, building the recovered coal post part by the hollow precast blocks to form a bearing building body, and coating a layer of cement slurry on the wall surface of the building body to form a wall on one side of the roadway till the tunneling work is finished. The method has the advantages that: on the one hand, the roadway protection coal post is saved and the coal resource is fully reclaimed, and on the other hand, the method solves the reutilization problem of the gangue and develops a new path for the utilization of the underground gangue.

Description

technical field [0001] The invention relates to a mining method of an underground coal mine. Background technique [0002] At present, in the underground mining of coal mines, coal pillars of a certain width must be reserved to protect the roadway when developing gob-side entry retention and goaf-excavation entry, and at the same time, high-strength support is required for the two sides of the reserved coal pillars. In the current resource shortage situation, the reserved coal pillars have caused the loss of coal resources. [0003] In addition, in the process of underground coal mining, a large amount of gangue will be produced. In order to deal with these gangues, the measures taken are generally to transport the gangue to the ground for accumulation, or to set up a gangue crushing and filling system underground to crush the gangue and backfill the goaf. A lot of human, material and financial resources are wasted. Contents of the invention [0004] The purpose of the p...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of wasting resources of reserved coal pillars and the utilization of underground gangue, and provide a method of using gangue instead of coal pillars for roadway protection. This invention can not only cancel the coal pillars of roadway protection, but also save The support cost of the two pillars of the roadway coal pillar reduces the mining cost