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Rock cross-cut coal uncovering method based on combination of electric pulse with grouting reinforcement

A technology of grouting reinforcement and coal excavation from stone gates, which is applied to earth-moving drilling, gas discharge, safety devices, etc., can solve the problems of low efficiency, difficult construction, restricting the progress of coal mine production, etc. The effect of broad utility value

Active Publication Date: 2019-01-08
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These measures have achieved some results in the coal mining and outburst prevention in Shimen, but there are also problems such as difficult construction and low efficiency, which seriously restrict the production progress of the coal mine.

Method used

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  • Rock cross-cut coal uncovering method based on combination of electric pulse with grouting reinforcement
  • Rock cross-cut coal uncovering method based on combination of electric pulse with grouting reinforcement
  • Rock cross-cut coal uncovering method based on combination of electric pulse with grouting reinforcement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 and figure 2 As shown, the method for uncovering coal in stone gates combined with electric pulse and grouting reinforcement of the present invention comprises the following steps:

[0026] a. Before the normal distance between the coal seam 15 and the coal seam 15 is less than 7m, the conventional drilling method is used to construct a borehole 16 with a diameter of 10cm to the coal seam 15, such as image 3 Boreholes are shown in a rectangular array;

[0027] b. After the drilling 16 is completed, the positive high-voltage cable 5 and the negative high-voltage cable 6 are respectively placed in the cable protection tube 3 with a diameter of 3 cm at the coal mining face 17, and the discharge electrode 4 is connected with the explosion-proof high-voltage electric pulse The generator 1 is connected through the positive high-voltage cable 5 and the negative high-voltage cable 6 respectively, and the discharge electrode 4 is sent to the bottom of the boreh...

Embodiment 2

[0033] like figure 1 and figure 2 As shown, the method for uncovering coal in stone gates combined with electric pulse and grouting reinforcement of the present invention comprises the following steps:

[0034] a. Before the normal distance between the coal seam 15 and the coal seam 15 is less than 7m, the conventional drilling method is used to construct a borehole 16 with a diameter of 10cm to the coal seam 15, such as image 3 Boreholes are shown in a rectangular array;

[0035] b. After the drilling 16 is completed, the positive high-voltage cable 5 and the negative high-voltage cable 6 are respectively placed in the cable protection tube 3 with a diameter of 3 cm at the coal mining face 17, and the discharge electrode 4 is connected with the explosion-proof high-voltage electric pulse The generator 1 is connected through the positive high-voltage cable 5 and the negative high-voltage cable 6 respectively, and the discharge electrode 4 is sent to the bottom of the pre-d...

Embodiment 3

[0041] like figure 1 and figure 2 As shown, the method for uncovering coal in stone gates combined with electric pulse and grouting reinforcement of the present invention comprises the following steps:

[0042] a. Before the normal distance between the coal seam 15 and the coal seam 15 is less than 7m, the conventional drilling method is used to construct a borehole 16 with a diameter of 10cm to the coal seam 15, such as image 3Boreholes are shown in a rectangular array;

[0043] b. After the drilling 16 is completed, the positive high-voltage cable 5 and the negative high-voltage cable 6 are respectively placed in the cable protection tube 3 with a diameter of 3 cm at the coal mining face 17, and the discharge electrode 4 is connected with the explosion-proof high-voltage electric pulse The generator 1 is connected through the positive high-voltage cable 5 and the negative high-voltage cable 6 respectively, and the discharge electrode 4 is sent to the bottom of the pre-dr...

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Abstract

The invention discloses a rock cross-cut coal uncovering method based on combination of electric pulse with grouting reinforcement. The method comprises the following steps that: drilling is carried out on a coal seam by a coal uncovering working face , a discharge electrode and a high-voltage cable are fed into a drilled hole and then water is injected into the drilled hole; an explosion-proof high-voltage electric pulse generator and the discharge electrode carries out discharging on water in the drilled hole to form a strong impact wave, so that the coal body cracks and methane desorption is promoted; after multi-times discharging ending, the drilled hole is connected to a gas extraction pipeline; a cement slurry is injected into the coal seam to enhance the mechanical strength of the coal body, so that the coal seam is reinforced and the coal uncovering is completed. According to the invention, because of combination of the electric pulse cracking with the grouting reinforcement, the porosity and permeability of the coal seam are improved, the methane desorption is promoted; the risk of coal and gas outburst is prevented effectively; and since the coal seam is strengthened, thesafety of the rock cross-cut coal uncovering is improved.

Description

technical field [0001] The invention relates to the technical field of coal removal in Shimen, in particular to a coal removal method in Shimen which is suitable for the combination of electric pulse and grouting reinforcement in highly gassy coal seams which are easy to protrude. Background technique [0002] Coal and gas outburst is one of the most common disasters in underground operations, and the average outburst intensity of Shimen coal mining is far greater than the sum of outburst intensities of other roadways. The outstanding problems in Shimen coal mining have seriously threatened the safety of underground workers and restricted the efficient production of coal mines. Studies have shown that the outburst of Shimen is the result of the combination of gas pressure, ground stress, and mechanical properties of coal, among which the mechanical strength of coal is the key factor for whether it can withstand the outburst. [0003] Existing coal mining methods for outburs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B33/13E21C41/18
CPCE21B33/13E21C41/18E21F7/00
Inventor 林柏泉张祥良李彦君朱传杰赵洋孔佳王正任洁
Owner CHINA UNIV OF MINING & TECH