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A grouting reinforcement method for fault fracture zone in coal mining face

A coal mining face, grouting reinforcement technology, applied in mining equipment, earthwork drilling, wellbore lining, etc., can solve the problem of coal and rock mass fragmentation, fault fracture zone treatment methods are difficult to effectively support, fault fracture zone coal rock Problems such as damage to the integrity of the body, to achieve the effect of guaranteeing the effect of grouting

Active Publication Date: 2021-03-23
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problem that the coal mining face encounters geological structures such as faults, the integrity of the coal and rock mass in the fault fracture zone is severely damaged, the coal and rock mass is broken, and it is difficult to effectively support the existing fault fracture zone treatment methods, the present invention provides a Grouting reinforcement method for fault fracture zone in coal mining face

Method used

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  • A grouting reinforcement method for fault fracture zone in coal mining face
  • A grouting reinforcement method for fault fracture zone in coal mining face
  • A grouting reinforcement method for fault fracture zone in coal mining face

Examples

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Embodiment 1

[0044] In this example, the mining of a coal mining face of a certain mine is taken as the engineering background. The coal seam of the a working face is: b coal, black, powdery, containing a small amount of block and thin slices, and the macroscopic coal rock type is semi-dark-semi Bright briquette, the macroscopic feature is that the coal seam is soft and brittle, broken into fragments and powder, the b coal seam has an average inclination angle of 6°-8°, and is partially affected by geological structures such as faults, and the occurrence and thickness of the b coal seam have certain changes. The average thickness of b coal seam is 3.4m, which belongs to relatively stable coal seam.

[0045] Such as image 3 As shown, fault c develops at an average distance of 290m from the cutting eye in the working face a. The nature of the fault is a reverse fault, with a strike of 187°, a dip of 98°, a dip of 86°, and a drop of 5.2m. The mining safety of the working face has a greater ...

Embodiment 2

[0064]In this embodiment, the mining of working face d of a mine is taken as the engineering background, and the coal seam condition of working face d is: f coal, black, powdery, bright coal, vitreous luster, soft in nature, and local inclusions with an average thickness of 0.5-0.8m Gangue (mudstone), the average thickness of the coal seam is 4.5m, and the average inclination angle is 8-10°, which belongs to the stable coal seam. The working face d dips with an average length of 149m, and e-fault develops at a position 142m away from the cutting eye. The e fault has an influence of 30m on the strike and 130m on the inclination, which has a great influence on the safe mining of the working face, such as Image 6 shown.

[0065] The method of parallel hole arrangement in the air lane is adopted to carry out static pressure pre-grouting outside the range of the advanced bearing pressure. First, the grouting of the curtain grouting layer is carried out within the influence range...

Embodiment 3

[0076] In this embodiment, when the coal mining face is mined within the influence range of the advanced abutment pressure, dynamic treatment is carried out on the basis of the static treatment in Example 1, and the dynamic treatment is flexibly supplemented according to the effect of the static treatment. When there is a large deviation between the static treatment effect and the expected effect, if necessary, use dynamic treatment, that is, one or more of the three grouting processes of shallow hole grouting, medium-deep hole grouting, and deep hole grouting. The fault fracture zone is strengthened by grouting, and the design principle of shallow hole, medium deep hole and deep hole drilling parameters is the same as that of embodiment 1; if there is no deviation or unnecessary, dynamic treatment on the basis of static treatment is not necessary.

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Abstract

The present invention discloses a method for grouting reinforcement of a fault fracture zone of a coal mining working face and belongs to the technical field of coal mine grouting reinforcement. For the method for grouting reinforcement of the fault fracture zone of a coal mining working face, a treatment idea of combining regional treatment with local treatment is adopted. The regional treatment is implemented ahead of the coal mining working face by a certain distance and is divided into static treatment and dynamic treatment, and advanced grouting reinforcement treatment is performed; local treatment is implemented in the working face; and the combination of regional treatment and local treatment can better achieve step-by-step progressive treatment of the fault fracture zone, and can achieve comprehensive and dynamic fault treatment free of blind corners.

Description

technical field [0001] The invention belongs to the technical field of grouting reinforcement in coal mines, and in particular relates to a grouting reinforcement method for a fault fracture zone of a coal mining face. Background technique [0002] In my country's coal mining, many working faces are inevitably arranged in coal seams with unfavorable geological conditions, some of which contain multiple fault zones. The lithological conditions in the fault structure area of ​​the coal mining face are relatively poor, which can easily cause the coal and rock mass near the fault surface to be broken and have poor stability. The fault fracture zone has a great impact on the safe mining of the working face. During the period of crossing the fault, if it is not properly controlled, it is very easy to cause coal wall fragmentation and roof drop, which may cause a decrease in mining speed and affect the production progress; Accidents such as roof casualties have caused great safety...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
CPCE21D11/10
Inventor 程详赵光明孟祥瑞李英明刘增辉孙建考四明许文松黄顺杰
Owner ANHUI UNIV OF SCI & TECH
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