Grouting reinforcement method for three-soft-coal-seam large-mining-height working face top slope

A three-soft coal seam, grouting reinforcement technology, applied in mining equipment, earth-moving drilling, wellbore lining and other directions, can solve the problems of the roof not forming a whole, the roof structure is loose, and the normal mining is difficult, etc., to achieve the effect of sealing holes Good, short response time, simple structure

Active Publication Date: 2019-05-24
HUAINAN MINING IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the time when the large mining height working face of the third soft coal seam passes through the fault or the roof is pressed periodically, due to the particularity of its structure, the stress on the roof will be uneven. Without forming a whole, its compressive capacity is weak, and the roof is easy to break and fall off, which brings difficulties to normal mining, and may cause casualties in severe cases, which is not conducive to normal construction

Method used

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  • Grouting reinforcement method for three-soft-coal-seam large-mining-height working face top slope
  • Grouting reinforcement method for three-soft-coal-seam large-mining-height working face top slope
  • Grouting reinforcement method for three-soft-coal-seam large-mining-height working face top slope

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Experimental program
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Effect test

Embodiment 1

[0044] A grouting reinforcement method for the roof of a working face with a large mining height in a three-soft coal seam, comprising the following steps:

[0045] A. Drilling straight holes in the coal wall: firstly judge whether the top gang has the drilling conditions. figure 1 As shown, the drilling parameters are as follows: the hole is 1m away from the roof, the elevation angle is 10°, the end point of the hole is 6m away from the coal wall, the projection of the axis of the hole on the horizontal plane is perpendicular to the coal wall, the hole diameter is 42mm, and the corresponding branch of two adjacent holes There is 1 support frame between the frames;

[0046] B. Grouting of coal wall straight holes: After the coal wall drilling is completed, the reinforcement material is injected into the coal wall hole. In this embodiment, the reinforcement material is selected from the Mina mine filling material, which is commercially available, and the injection is stopped un...

Embodiment 2

[0055] The difference between this embodiment and Embodiment 1 is:

[0056] In step A, the hole is 1.2m away from the top plate, the elevation angle is 12°, the end point of the hole is 7m away from the coal wall, the hole diameter is 42mm, and there are 2 supporting frames between the supporting frames corresponding to two adjacent holes;

[0057] In step B, the sealing depth is 2.5m;

[0058] In step C, the hole is 1.2m away from the top plate, the elevation angle is 12°, the end point of the hole is 5m away from the coal wall, the angle between the projection of the axis of the hole on the horizontal plane and the coal wall is 30°, and the hole diameter is 42mm. There is 1 support frame between the support frames;

[0059] The sealing depth in step D is 2.5m;

[0060] In step E, the hole is 1.2m away from the top plate, the elevation angle is 40°, the end point of the hole is above the top plate and 2.3m away from the top plate, the hole diameter is 42mm, and there is one...

Embodiment 3

[0066] The difference between this embodiment and Embodiment 1 is:

[0067] In step A, the hole is 1.5m away from the top plate, the elevation angle is 15°, the end point of the hole is 8m away from the coal wall, the hole diameter is 42mm, and there are 3 supporting frames between the supporting frames corresponding to two adjacent holes;

[0068] The sealing depth in step B is 3m;

[0069] In step C, the hole is 1.5m away from the top plate, the elevation angle is 15°, the end point of the hole is 6m away from the coal wall, the angle between the projection of the axis of the hole on the horizontal plane and the coal wall is 35°, the hole diameter is 42mm, and the two adjacent holes correspond to There are 3 support frames between the support frames;

[0070] The sealing depth in step D is 2m;

[0071] In step E, the hole is 1.5m away from the top plate, the elevation angle is 57°, the end point of the hole is located above the top plate and 2.5m away from the top plate, t...

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Abstract

The invention relates to the field of coal mine reinforcement, in particular to a grouting reinforcement method for a three-soft-coal-seam large-mining-height working face top slope. The method includes: drilling a straight hole in a coal wall, grouting the straight hole in the coal wall, drilling an oblique hole in the coal wall, grouting the oblique hole in the coal wall, drilling a straight hole in a roof rock layer, grouting the straight hole in the roof rock layer, drilling an oblique hole in the roof rock layer, grouting the oblique hole in the roof rock layer, drilling and grouting in acirculating manner and the like. The method has the advantages that the top slope is reinforced by using the roof and coal wall circulating grouting method, and a good actual effect is obtained; whenthe working face passes an abnormal area fault, various parts of the top slope are integrated by using the grouting reinforcement method, the pressure resistance of the top slope is increased greatly, the top slope is less prone to crushing and falling off, normal stoping can be performed, normal construction can be carried out, the passive situation of the top slope can be reversed fast, the working face can safely pass the fault, and the method plays an important role in working face fault-passing crushing area reinforcement roof support.

Description

technical field [0001] The invention relates to the field of coal mine reinforcement, in particular to a grouting reinforcement method for the top side of a three-soft coal seam working face with a large mining height. Background technique [0002] During the time when the large mining height working face of the third soft coal seam passes through the fault or the roof is pressed periodically, due to the particularity of its structure, the stress on the roof will be uneven. Without forming a whole, its compressive capacity is weak, and the roof is easy to break and fall off, which brings difficulties to normal mining, and may cause casualties in serious cases, which is not conducive to normal construction. Contents of the invention [0003] The technical problem to be solved by the present invention is: the problem that the top side is easy to break and fall off in the prior art. [0004] In order to solve the above-mentioned technical problems, the technical solution ado...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
Inventor 代群超汪文进刘阿振邸宝王冲余克祥
Owner HUAINAN MINING IND GRP
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