Control method for size and shape of piers filled with high-concentration slurry in hollow goaf

A control method and technology for goafs, which are applied in the fields of backfill, mining equipment, earthwork drilling, etc., can solve the problems of inability to release, control, and the range of high and unconnected tops, and achieve the effect of reducing backfill costs and waste.

CN111978018BActive Publication Date: 2022-04-15XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-04-15

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Abstract

The invention relates to a method for controlling the size and shape of a filling pier column, belonging to the field of goaf management, in particular to a method for controlling the size and shape of a pier column filled with high-concentration slurry in a hollow goaf. The invention proposes a method for controlling the size and shape of pier columns filled with high-concentration slurry in hollow-type goafs. The method can be operated on the ground, injecting high-concentration slurry into the goaf, and forming The pier column with controllable size and shape uses local filling method to establish an effective load-bearing pier column inside the goaf to effectively support the roof, control roof deformation, save grouting materials, and reduce engineering costs.
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Description

technical field

[0001] The invention relates to a method for controlling the size and shape of a filling pier column, belonging to the field of goaf management, in particular to a method for controlling the size and shape of a pier column filled with high-concentration slurry in a hollow goaf. Background technique

[0002] Coal mine large cavity goaf is a huge cavity left after the mining of underground coal resources. It is an unstable artificial geological structure. With the passage of formation time and changes in the environment, this unstable structure may occur. Degradation leads to mine disasters such as ground subsidence and mine earthquakes. Especially in small coal mines, the mining methods are backward, the roof management method is extensive, and the necessary geological data is lacking. The potential disasters in the remaining gobs are even more serious. Since most of the current mined-out areas are left over after many years of mining, the working face has lo...

Examples

Embodiment

[0046] A method for controlling the size and shape of piers filled with high-concentration slurry in a hollow-type goaf, comprising the following steps: using a drilling method to drill on the ground at the design position of the goaf, and penetrate the roof of the goaf; The grouting pipe is installed in the middle, on the one hand, it provides a smooth path for the slurry transportation, and on the other hand, it prevents the ground from collapsing and collapsing when it encounters water; the slurry accumulation angle is controlled by the slurry ratio, the viscosity of the slurry itself, and the change of yield stress with time; Use the pumping method to control the slurry diffusion distance and the surface area of ​​the slurry. Ensure that the grouting fluid forms the designed piers in the large-cavity goaf. After the piers solidify, they can effectively support the roof of the goaf and control the deformation of the roof.

[0047] (1) Reasonably prepare the slurry, and cont...