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A regional outburst prevention method based on integrated explosive injection of strong, weak and strong structures

A technology with strong structure and strength, which is applied in the fields of fluid extraction, earthwork drilling, wellbore/well components, etc., can solve the problems of difficult to guarantee gas drainage effect and small development degree of coal seam fissures, so as to prevent coal seam stress disasters, The effect of smooth gas drainage operation and improving coal seam gas drainage effect

Active Publication Date: 2020-06-16
CHINA UNIV OF MINING & TECH
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  • Claims
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Problems solved by technology

However, for low-permeability coal seams, the development of coal seam fractures is relatively small, and the gas drainage effect is difficult to guarantee.

Method used

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  • A regional outburst prevention method based on integrated explosive injection of strong, weak and strong structures
  • A regional outburst prevention method based on integrated explosive injection of strong, weak and strong structures
  • A regional outburst prevention method based on integrated explosive injection of strong, weak and strong structures

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Embodiment Construction

[0021] An embodiment of the platform of the present invention will be further described below in conjunction with the accompanying drawings:

[0022] According to the present invention, an integrated region outburst prevention method based on strong, weak and strong structure detonation, the specific steps are as follows:

[0023] a. First determine the position of the pre-excavation roadway 3 in the coal seam 1, and then construct the roadway bottom extraction roadway 4 at 20-30m below the pre-excavation roadway 3;

[0024] b. Construct two rows of detonation holes 5 from the bottom of the roadway 4, the distance between the intersection of the detonation holes 5 and the bottom plate of the coal seam 1 is Xm from the pre-excavation roadway 3; the distance Xm is determined according to the size of the coal seam 1 and the design protection range, The value is 5-15m. The mine explosive 7 is sent to the middle of the coal seam 1 in the detonation hole 5 with the PVC drug deliver...

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Abstract

The invention discloses an outburst prevention method of a blasting and injection integrated area on the basis of a strong-weak-strong structure and belongs to outburst prevention methods for underground coal mine areas. According to the outburst prevention method, two rows of blasting injection holes are formed from the interior of a bottom pumping roadway of a pre-digging roadway to the two sides of the pre-digging roadway, and loosening blasting operation, hydraulic fracturing operation and gas mining operation are conducted in sequence. Through loosening blasting, cracks of coal layers quickly expand, and circulation passages are provided for water flow and gas. The large amount of water flow injected through the fracturing operation can displace out gas in the coal layers and enable the gas to move along crack passages generated by blasting, and the gas mining operation is more efficient. When a series of operation of blasting, fracturing and mining is completed, weak stress areasare formed at the blasting injection holes in the two sides of the pre-digging roadway; in a later digging process of the pre-digging roadway, since the strong-weak-strong coupling structure is formed on the two sides of the pre-digging roadway, a coal layer stress buffering area is formed, and the outburst risk of coal and gas caused by coal layer stress and gas pressure is effectively inhibited.

Description

technical field [0001] The invention relates to the technical field of coal and gas outburst and stress disaster prevention and control, in particular to a regional outburst prevention method based on the integrated blast injection of strong, weak and strong structures, which is suitable for high gas and low permeability coal seams in the process of driving underground coal roadways in coal mines. Background technique [0002] During the excavation process of underground coal roadways in coal mines, in order to prevent stress disasters mainly caused by coal and gas outburst, it is often necessary to drill through the coal seam below or above the coal seam to extract the gas in the coal seam. However, for low-permeability coal seams, the degree of development of coal seam fractures is small, and the gas drainage effect is difficult to guarantee. After adopting common gas drainage measures, the risk of coal and gas outburst during coal roadway excavation remains high. Therefo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21B43/26E21B43/263E21B43/20
CPCE21B43/20E21B43/26E21B43/263E21F7/00
Inventor 杨威林柏泉王正林明华路长征王皓
Owner CHINA UNIV OF MINING & TECH
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