Deep hole pre-grouting top plate reinforcement method for large-mining height working face under special geological conditions

A special geological and working face technology, applied in underground chambers, mining equipment, earthwork drilling and mining, etc., can solve the problems of high polymer shallow grouting cost, poor effect, accidents and disasters of personnel and equipment, and achieve reinforcement Good effect, avoid downhole accidents, reasonable parameters

Active Publication Date: 2013-01-16
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to prevent the partial roof caving of the working face with large mining height due to special geological conditions, causing accidents and disasters such as personnel and equipment; To solve the problems of high cost of grouting in the shallow part of the molecule, a method of pre-grouting in deep holes to strengthen the roof of the working face with large mining height and special geology is provided.

Method used

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  • Deep hole pre-grouting top plate reinforcement method for large-mining height working face under special geological conditions
  • Deep hole pre-grouting top plate reinforcement method for large-mining height working face under special geological conditions

Examples

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Effect test

Embodiment 1

[0019] The large mining height working face of 4210 main lane of Changping Coal Industry Company revealed the collapsed column (special geology). In order to ensure the smooth passage of the mining face, the top of the collapsed column needs to be reinforced by grouting. According to the site survey, the collapsed column is an elliptical long axis 65 meters, the short axis is 21 meters, and the axial direction is 38°. The collapse column does not contain water, and the north-south influence range in the working face is 57 meters, and the east-west influence range is 42 meters.

[0020] The affected area of ​​the collapse column is 57m long. Considering the high pressure on the roof after mining, the grouting reinforcement sections extending 15 m on both sides of the collapse column were exposed in the roadway, and the total grouting reinforcement section was 87m.

[0021] The grouting reinforcement of the collapsed column of the working face is carried out below by the method o...

Embodiment 2

[0027] A fault (special geology) was found in the large mining height working face of a mine. In order to ensure the smooth passage of the mining face, the top of the fault needs to be reinforced by grouting. According to the on-site survey, the fault has a north-south influence range of 72 meters and an east-west influence range of 53 meters in the working face .

[0028]The length of the working face affected by the fault is 72m. Considering the high roof pressure after mining, the grouting reinforcement section extending 15m on both sides of the fault is exposed in the roadway, and the total grouting reinforcement section is 102m.

[0029] Carry out grouting reinforcement to this working face fault by the method of the present invention below, specifically comprise the following steps:

[0030] 1) It is determined that the influence range of the fault in the large mining height working face is 102m, and then arrange three rows of drill holes from top to bottom on the side o...

Embodiment 3

[0035] A soft coal area (special geology) was found in the large mining height working face of a mine. In order to ensure the smooth passage of the mining face, grouting was required to reinforce the top of the soft coal area. According to the on-site survey, the soft coal area has a north-south influence range of 32 meters in the working face , the east-west influence range is 19 meters.

[0036] The length of the working face affected by the soft coal area is 32m. Considering the high roof pressure after mining, the grouting reinforcement sections extending 10 m on both sides of the soft coal area are exposed in the roadway, and the total grouting reinforcement section is 52m.

[0037] Carry out grouting reinforcement by the soft coal area of ​​this working face below by the inventive method, specifically comprise the following steps:

[0038] 1) Determine that the influence range of the soft coal area in the large mining height working face is 102m, and then arrange three r...

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Abstract

The invention discloses a deep hole pre-grouting top plate reinforcement method for a large-mining height working face under special geological conditions. By the method, the phenomenon that local inbreak accidents of a top plate of the large-mining height working face are easy to cause due to the special geological conditions can be avoided, and the problems of poor effect of the conventional cement grout advanced reinforcement of the special geological conditions and high cost of high-polymer shallow part grouting can be solved. The method comprises the following steps of: distributing three lines of drilled holes on a laneway's side from top to bottom in a crossed shape, adjusting the angles of all the drilled holes, and controlling the positions of end holes, so that the effect of multi-point multi-face effective distance reinforcement can be achieved; after each drilled hole is opened, inserting a 108 sleeve pipe into the drilled hole, and solidifying by using grout; when each hole is drilled forward 5 meters, grouting once; after initial setting, cleaning, and drilling the next section continuously, wherein during construction, a short circle is finished after the drilling depth reaches 5 meters; and after solidification, cleaning and continuously drilling until the hole depth reaches the designed depth. The method has the advantages of good reinforcement effect, reasonable parameter, simplicity in construction, low cost and safety and reliability, and is particularly suitable for reinforcing the large-mining height working face under the special geological conditions.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to a method for pre-grouting deep hole pre-grouting to reinforce a roof in a working face with a large mining height and through special geology. Background technique [0002] Due to the large mining height and soft coal quality of the large mining height working face, the mine pressure of the large mining height working face is obvious, which is easy to induce roof fall accidents. Especially in the case of special geological conditions such as subsidence columns, faults, and soft coal areas, due to the broken rock mass in these special geological areas, the length of the coal side is basically more than 2.5 meters, which is more likely to cause roof fall accidents and seriously affect the mine. safe production. In order to reduce the length of the coal side in the special geological structure and improve the bearing capacity of the coal side, many mines have gradually str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10
Inventor 杨文斌王永革田书龙张育恒蔺吉胜胡红伟郑学亮曹雪芹成国清徐慧芳杨文晖曹建波
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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