Grouting treatment method for strip mining goaf

A goaf and grouting technology, which is applied in mining equipment, earth square drilling, filling, etc., can solve problems such as difficult to grasp the long-term stability of striped coal pillars, imperfect technology, and difficult governance, and achieve a good society and economic value, the number of drilling holes is small, and the effect of easy promotion

Active Publication Date: 2019-01-08
COAL IND JINAN DESIGN & RES
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Problems solved by technology

The caving method is often used to manage the roof in strip mining in my country, but the long-term stability of the strip coal pillar is currently difficult to grasp. In order to ensure the safety of ground construction, it is necessary to deal with the goaf, especially the strip mining over 500m The research on the management of gobs is almost blank. Due to its deeper depth, there are problems such as difficult management, high cost, and imperfect technology.

Method used

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  • Grouting treatment method for strip mining goaf
  • Grouting treatment method for strip mining goaf
  • Grouting treatment method for strip mining goaf

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Embodiment Construction

[0024] Accompanying drawing is a kind of specific embodiment of the present invention.

[0025] The strip mining goaf grouting treatment method of the present invention comprises the following steps:

[0026] Step 1: Borehole 1 location and layout planning: within the control range of the determined strip goaf 2 (the width of the goaf is generally 40m~80m) on the surface, the designed borehole 1 is located at the distance between both sides of the goaf 2 12m from the coal wall, arranged in double rows; drill holes 1 are arranged in groups of two, the distance between two holes in a group is 30m, and the distance between groups is 60m. The arrangement of the above-mentioned boreholes 1 avoids the dangerous areas of insufficient collapse and natural accumulation on the side of the coal wall and the long-term vulnerability of the coal wall to the erosion of mined-out water, and focuses on protecting the coal pillar, strengthening the plastically damaged area of ​​the coal pillar,...

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Abstract

The invention belongs to the technical field of mining engineering and particularly relates to a grouting treatment method for strip mining goaf. The method comprises the steps of (1) drill hole position and arrangement planning, (2) instrument fixation, drilling, casing laying, and grouting pipe laying, (3) slurry raw material preparation, (4) slurry cooperation and mixture, (5) grouting operation, and (6) grouting pipe collection. The method has the advantages that the overburden strata balance structure of the strip mining is consolidated, the long-term stability of a ground surface is achieved, the stability of a building foundation is ensured, materials are saved, the environment is protected, and the method has good social and economic values and is easy to promote.

Description

technical field [0001] The invention belongs to the technical field of mining engineering, and in particular relates to a grouting treatment method for strip mining goafs. Background technique [0002] The filling effect and quality of underground gobs directly affect the recovery and mining benefits of subsequent ore bodies. Improving the filling effect is of great significance to ensure production safety, reduce production costs, reduce losses and dilution rates, and improve economic benefits. [0003] The basic method of strip mining technology is to use the retained strip coal pillars to support the overlying strata, so as to recover part of the coal resources, control the deformation of the surface and protect the buildings on the ground. The caving method is often used to manage the roof in strip mining in my country, but the long-term stability of the strip coal pillar is currently difficult to grasp. In order to ensure the safety of ground construction, it is necessa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/00
CPCE21F15/005
Inventor 于飞郭宝德张勇赵琦华祥王晓勇何峰华张荣营
Owner COAL IND JINAN DESIGN & RES
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