High-pressure gas blasting-based coal seam roof advance presplitting method

A high-pressure gas, coal seam roof technology, which is applied in earth-moving drilling, mining equipment, mining equipment, etc., can solve the problems of unsatisfactory coal seam hard roof effect, and achieve the effect of eliminating spark danger, good pre-splitting effect and small dynamic disturbance.

Active Publication Date: 2013-10-02
LIAONING TECHNICAL UNIVERSITY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the in-situ stress sensitivity of hydraulic fracturing rock mass crack propagation, the potential spark hazard of chemical explosive blasting and the strong dynamic disturbance of the high-peak blast shock wave on the coal seam, the above-mentioned technology is not ideal for dealing with the hard roof of the coal seam.

Method used

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  • High-pressure gas blasting-based coal seam roof advance presplitting method
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  • High-pressure gas blasting-based coal seam roof advance presplitting method

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Embodiment 1

[0021] Below in conjunction with the embodiment (accompanying drawing) of a long 150m working face, the present invention is further described.

[0022] The implementation of the advanced pre-splitting method of the coal seam roof based on high-pressure gas explosion includes the following steps in sequence:

[0023] 1) A group of drill holes with a diameter of 90 mm are made on the coal seam roof 13 at intervals of 20 m on the transport chute 11 and the track chute 12 on the working face. Each group of drill holes is arranged in a fan shape and faces the goaf. Elevation angles of 6, 2 and 7, 3 and 8, 4 and 9, 5 and 10 β Respectively 39.23°, 42.74°, 44.06°, 44.5°, 44.69°, horizontal angle α They are 45°, 24.44°, 15.12°, 10.89°, 8.49° respectively, and the drilling lengths are 17.32m, 26.15m, 39.61m, 53.89m, 68.48m respectively. ~15m, the vertical projection of each group of boreholes and the horizontal projection along the advancing direction of the working face are 10m and ...

Embodiment 2

[0028] The steps of embodiment 2 are basically the same as those of embodiment 1, except that in step 1), the diameter of each drilled hole is 75 mm.

Embodiment 3

[0030] The steps of embodiment 3 are basically the same as those of embodiment 1, except that in step 3), the gas source of the high-pressure gas is air.

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Abstract

The invention discloses a high-pressure gas blasting-based coal seam roof advance presplitting method, which belongs to the technical field of mine safety. The method is performed according to the following steps: (1) forming a group of drilled holes in a coal seam roof every a certain distance on a conveying roadway and a track roadway of a working face, wherein each group of drilled holes is arranged in a fan shape and faces towards a goaf; (2) placing a gas detonation gun which is connected with a high-pressure gas compression system in the drilled hole and sealing the hole by using high-strength fast setting concrete or resin; (3) starting the high-pressure gas compression system and instantaneously releasing high-pressure gas in a high-pressure gas storage tank in the drilled hole through the gas detonation gun to blast so as to communicate the crack around the drilled holes with adjacent drilled holes; and (4) repeating the steps (2) and (3) on each group of drilled holes in sequence to finish advance presplitting of the coal seam roof. According to the method, the potential spark hazard of chemical explosive blasting is eliminated; and since the pressure of the high-pressure gas is controllable and impact blasting can be repeatedly performed on the rock body, the dynamic disturbance of a coal seam is small, the roof presplitting effect is good, and the method is environment-friendly, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of coal mine safety, in particular to an advanced pre-splitting method of a coal seam roof based on high-pressure gas blasting. Background technique [0002] In order to reduce the overhang area of ​​the goaf, shorten the initial and periodic pressure steps, and reduce the initial and periodic pressure strength, the coal seam roof in my country mainly adopts hydraulic fracturing, circular shallow hole blasting, ground deep hole blasting and advanced The hard roof of the coal seam is weakened by methods such as deep hole pre-splitting blasting method. Due to the in-situ stress sensitivity of hydraulic fracturing rock crack propagation, the potential spark hazard of chemical explosive blasting and the strong dynamic disturbance of high-peak blast shock waves on coal seams, the above-mentioned techniques are not ideal for dealing with hard roofs of coal seams. Contents of the invention [0003] In order to ov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/00
Inventor 赵宝友张立新李刚贾廷贵
Owner LIAONING TECHNICAL UNIVERSITY
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