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Room type goaf filling method

A technology for gobs and filling stations, which is applied to fillings, mining equipment, earthwork drilling and mining, etc., to achieve the effects of increasing coal recovery rate, convenient operation, and small space occupation

Active Publication Date: 2016-07-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a filling method for the goaf, which solves the problem of how to effectively and economically control the collapse of the overlying strata in the goaf under the premise of minimizing the coal loss caused by the goaf question

Method used

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Examples

Experimental program
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Embodiment 1

[0032] Taking two adjacent coal pillars in the goaf as an example, as shown in figure 1 In the above, at the position where the coal pillar 2 of the goaf is in contact with the overlying roof 1 of the goaf, a groove 4 is excavated on the coal pillar. The shape of the groove is a cuboid; the groove is located at the top of the coal pillar with a rectangular section , the length of the groove is 1 / 2 of the rectangular long side of the coal pillar, the width of the groove is 1 / 3 of the rectangular wide side of the coal pillar, and the height of the groove is equal to its width, so that the support structure formed in this way has high stability.

[0033] Do the same work on another adjacent coal pillar. During this period, in order to prevent the roof from falling, a metal mesh false roof can be arranged in the construction area to ensure construction safety.

[0034] A grouting groove 3 is set above the adjacent coal pillars where two grooves have been excavated, and a grouting...

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Abstract

The invention discloses a room type goaf filling method.Firstly, two adjacent coal pillars in an underground room type goaf are selected, and grooves are formed in the centers of the coal pillars; a series of grooves are formed through the method; grouting grooves are produced through a thick-wall steel plate, the grouting grooves are installed above the grooves of the two adjacent coal pillars so that the grouting grooves can be clamped into the grooves; grouting holes are formed in the centers of the tops of the grouting grooves; expansion slurry is injected into the grouting grooves through a grouting device, after the expansion slurry is solidified and reaches final strength, whether the expansion slurry is connected with a goaf top plate or not is judged, if yes, the procedure ends, and otherwise, secondary injection is conducted till a filling body is connected with the goaf.Transport is convenient, transport difficult is reduced, and raw material cost and transport cost are reduced.The construction technology is greatly simplified and easy to implement.Compared with the existing measure that a coal pillar treatment goaf is reserved, the size of the coal pillars can be reduced to a certain degree, residual coal is reduced, and the coal recovery ratio is increased.

Description

technical field [0001] The invention relates to a filling method for a room-type goaf, belonging to the technical field of coal mining. Background technique [0002] After the underground coal seam is mined, usually the goaf should be dealt with. The purpose is to prevent the sudden collapse of the overlying strata from causing rock burst or large surface subsidence. Taking improper measures such as leaving only ore pillars to deal with goafs can easily lead to dangerous accidents. For example, in 2005, after years of mining in Xingtai gypsum mine in Hebei Province, the gobs were not properly treated, and the size of coal pillars was generally deviated due to over-mining. The ground pressure was small, which induced the rock burst, and finally caused 33 deaths and dozens of injuries and other serious consequences. The current treatment methods for gobs include four basic methods and combined methods developed on the basis of them. These four basic methods include caving me...

Claims

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Application Information

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IPC IPC(8): E21F15/04E21F15/08
CPCE21F15/005E21F15/04E21F15/08
Inventor 冯国瑞郭峰戚庭野刘国艳白锦文张玉江郭军康立勋
Owner TAIYUAN UNIV OF TECH
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