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Rock cross-cut coal uncovering method with horizontal jet grouting piles for reinforcement

A technology of horizontal rotary jetting piles and coal excavation by stone gates, which is applied in earth-moving drilling, drilling with liquid/gas jet, ground mining, etc., can solve the problems of inability to achieve reinforcement, limited diffusion radius of cement slurry, etc., and achieves wide practicability, The effect of improving the reinforcement strength and expanding the reinforcement range

Active Publication Date: 2016-01-06
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Conventional grouting reinforcement can improve the strength of the coal seam to a certain extent, but due to the small cracks in the coal body and the limited diffusion radius of the cement slurry, it can only improve the strength of the coal seam in the coal uncovered area in a small range, and cannot achieve reinforcement in a larger area

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  • Rock cross-cut coal uncovering method with horizontal jet grouting piles for reinforcement
  • Rock cross-cut coal uncovering method with horizontal jet grouting piles for reinforcement
  • Rock cross-cut coal uncovering method with horizontal jet grouting piles for reinforcement

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Embodiment Construction

[0018] An embodiment of the patent of the present invention will be further described below in conjunction with the accompanying drawings:

[0019] The method for unearthing coal at the reinforced stone gate of the horizontal jet grouting pile of the present invention adopts equipment such as a drilling rig, a high-pressure horizontal jet grouting pile machine, and uses high-pressure water jets, compressed air, and cement slurry as the jet jetting materials. The specific steps are as follows:

[0020] Excavate along the coal uncovering working face 2 in front of the tunneling roadway 1. Before the minimum normal distance between the coal uncovering working face 2 and the uncovered coal seam 4 is less than 7 meters, use the hanging wire and level to debug and install the hole opener, and move towards the coal seam. Construction of multiple pre-opening holes, the number of multiple pre-opening holes constructed in the direction of the coal seam is 4, and the depth of the opening ...

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Abstract

The invention discloses a rock cross-cut coal uncovering method with horizontal jet grouting piles for reinforcement. The method is applicable to medium-thickness coal seams with outburst risks and includes the steps: stopping tunneling when a minimum normal distance between a working face of coal uncovering and an uncovered coal seam is smaller than 7m; using a drilling rig for drilling holes, penetrating a coal seam roof, in the working face of coal uncovering; connecting with a gas extraction pipe for gas extraction; when gas content and gas pressure are reduced to permitted ranges, using a jet grouting pile machine for realizing horizontal jet grouting of each drill hole to form firm horizontal jet grouting piles in the drill holes, so that coal seam reinforcement range is widened while coal seam reinforcement strength is improved greatly, and coal seam outburst risks are reduced; after the horizontal jet grouting piles are thoroughly solidified, continuing to tunnel until a whole coal uncovering process is finished. The rock cross-cut coal uncovering method with the horizontal jet grouting piles for reinforcement has the advantages of safety and quickness in completion of coal uncovering operations and reduction of input of manpower, material resources and financial resources.

Description

technical field [0001] The invention relates to a method for uncovering coal at a stone gate, in particular to a method for uncovering coal at a stone gate which is reinforced by a horizontal jet grouting pile and is suitable for medium-thick coal seams with a risk of outburst. Background technique [0002] So far, the method of uncovering coal in outburst coal seams is mainly carried out from the two aspects of pressure relief and reinforcement of coal seams. The methods of pressure relief and permeability enhancement of coal seams mainly include measures such as hydraulic punching, hydraulic fracturing, and hydraulic slotting. In terms of coal seam reinforcement, there are mainly metal Skeleton and grouting reinforcement measures. These measures have achieved some results in the prevention of outburst by uncovering coal in Shimen, but there are also deficiencies, especially in the aspect of coal seam reinforcement. Conventional grouting reinforcement can improve the stren...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21F7/00E21B7/18E21D9/00
Inventor 林柏泉郝志勇宋吴兵孙炜浩万元李博洋
Owner CHINA UNIV OF MINING & TECH
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