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Method for reinforcing soft broken coal rock by directional grouting

A technology of crushing coal rocks and grouting reinforcement, which is applied in earthwork drilling, shaft lining, tunnel lining, etc. It can solve the problems of slurry waste, difficult mining, and increased mining costs, and achieves low cost, saving consumption, and easy implementation Effect

Inactive Publication Date: 2011-11-09
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The soft and broken coal rock is difficult to mine due to the softness and brokenness of the coal seam and roof and floor. At present, for the mining of soft and broken coal rock, in order to prevent the roof from appearing during the mining process, it is necessary to carry out grouting reinforcement on the pre-mining section. However, the known grouting method simply drills holes along the oblique direction and injects high-strength reinforcement grout to form an agglomeration layer, and the mining process destroys the agglomerated coal seam. This grouting method causes a large amount of waste of more expensive grout, increase mining costs

Method used

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  • Method for reinforcing soft broken coal rock by directional grouting
  • Method for reinforcing soft broken coal rock by directional grouting
  • Method for reinforcing soft broken coal rock by directional grouting

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment one: see figure 1 , figure 2 ,, the number 1 in the figure is the mined section, 2 is the pre-mined section, 11 is the upper layer grouting pipe of the mined section, 14 is the upper fixed section of the mined section, 15 is the middle fixed section of the mined section, 21 is The upper layer grouting pipe of the pre-mining section, 22 is the middle layer grouting pipe of the pre-mining section, 23 is the lower layer grouting pipe of the pre-mining section, 24 is the upper reinforcement section of the pre-mining section, and 25 is the middle layer reinforcement section of the pre-mining section , 26 is the lower layer reinforcement section of the pre-mined section, 34 is the upper layer reinforcement section of the unmined section, 35 is the middle layer reinforcement section of the unmined section, 36 is the lower layer reinforcement section of the unmined section, 17 is the top of the mining face, and 18 is the mining surface Face end face, and 20 are slu...

Embodiment 2

[0028] Embodiment two: see image 3 , Figure 4 , the labels are the same as those in Embodiment 1, and will not be repeated. The reinforcement method of this embodiment is to excavate pits upwards at the top of the mined area close to the mining face to form a drilling work area 19, divide the vertical area where the pits are located as the upper fixed section, and mine along the end face of this section. Drill holes in different directions; from the upper fixed section downwards, it is divided into a middle fixed section and a lower fixed section, and holes are drilled at the end faces of the middle fixed section and the lower fixed section in the mining direction; the insertion length in each drill hole is not less than d The constant-pressure grouting pipes with holes are used to inject reinforcement grout into each constant-pressure grouting pipe. Among them, the cost performance of reinforcement grout A in the upper and lower reinforcement sections is lower than that of...

Embodiment 3

[0030] Embodiment three: see Figure 5 , Figure 6 , Figure 7 , label is the same as embodiment one, does not repeat, increases label 5 and is the subsection grouting pipe of middle and upper layer, and 6 is the subsection grouting pipe of middle and lower floor, and 7 is that only inner section has grouting hole (length is d ) grouting pipe, pre-mined virtual section 27, and unmined virtual section 37.

[0031] The reinforcement method of this embodiment is, on the upper part of the mining face, divide the upper layer fixed section, the middle layer fixed section, the lower layer fixed section and the virtual section 27 respectively from top to bottom; The section is drilled upwards inclined to the horizontal plane, and the length of the drilling hole is not less than 2d. Segmented grouting pipes with holes are respectively inserted into the boreholes of the middle fixed section and the lower fixed section of the pre-mining section. See Figure 6 , each segmented grouting...

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Abstract

The invention relates to a method for reinforcing soft broken coal rock by directional grouting, comprising the following steps of: respectively dividing an upper-layer fixed section, an intermediate-layer fixed section and a lower-layer fixed section at the upper part of a mining surface from top to bottom; respectively upwards drilling on each layer of fixed sections along the direction inclined to a horizontal plane; and respectively inserting constant pressure grouting pipes with a plurality of holes into each drill hole and injecting reinforcing slurry into each constant pressure grouting pipe, wherein the cost performance of reinforcing slurry A of the upper-layer reinforcing section and the lower-layer reinforcing section is lower than that of reinforcing slurry B on the intermediate-layer fixed section. According to the method disclosed by the invention, a pre-mined coal layer is divided into layers and sections; the phenomenon of no top bursting in the mining process is ensured and the consumption of expensive reinforcing slurry B is saved as much as possible, thereby the mining cost is saved. The invention has the advantages of reasonable design, economy and remarkable effect for saving cost and is easy to implement through practical application.

Description

technical field [0001] The invention relates to a method for fixing soft and broken coal rocks, in particular to a directional grouting reinforcement method for soft and broken coal rocks. Background technique [0002] The soft and broken coal rock is difficult to mine due to the soft and broken coal seam, roof and floor. At present, for the mining of soft and broken coal rock, in order to prevent the roof from appearing during the mining process, it is necessary to carry out grouting reinforcement for the pre-mining section. However, the known grouting method simply drills holes along an oblique direction and injects high-strength reinforcement grout to form an agglomeration layer, and the mining process destroys the agglomerated coal seam. This grouting method causes a large amount of waste of more expensive grout, Increase mining costs. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the invention provides a directional grouti...

Claims

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Application Information

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IPC IPC(8): E21D11/10
Inventor 李辉
Owner HENAN POLYTECHNIC UNIV
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