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Method for increasing permeability of low-permeability coal seam by means of deep-hole directional pre-splitting blasting

A technology of pre-splitting blasting and low air permeability, which is applied in the direction of earthwork drilling, gas discharge, mining fluid, etc. It can solve the problems affecting the coal seam gas extraction rate and extraction effect, and the coal seam low air permeability, so as to prevent gas disaster accidents The effect of occurrence, improvement of air permeability, and high gas drainage efficiency

Active Publication Date: 2013-09-25
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

However, as the mining depth of coal seams increases, the gas content and pressure of coal seams increase, and the permeability of most coal seams is only (0.001-0.1)×10 -3 um 2 , the gas permeability of the coal seam is low, which seriously affects the extraction rate and effect of coal seam gas

Method used

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  • Method for increasing permeability of low-permeability coal seam by means of deep-hole directional pre-splitting blasting
  • Method for increasing permeability of low-permeability coal seam by means of deep-hole directional pre-splitting blasting
  • Method for increasing permeability of low-permeability coal seam by means of deep-hole directional pre-splitting blasting

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specific Embodiment approach

[0019] The method for increasing permeability of low-permeability coal seam by deep hole directional pre-splitting blasting of the present invention, its preferred embodiment is:

[0020] Include steps:

[0021] First of all, using conventional operation methods, construct large-diameter blasting holes in high-gas and low-permeability coal seams;

[0022] Then, the four-way vertical slit pipe is used as the blasting charge pipe and the water bag pipe, and the four positions of 0°, 90°, 180° and 270° in the circumferential direction of the four-way vertical slit pipe are respectively provided with longitudinal slits. seam

[0023] Afterwards, the four-way vertical slotted tube with the charge roll and the four-way vertical slotted tube with the water bag are arranged at intervals to fill the large-diameter blasting hole with explosives, and the explosives are indexed through the double detonator. , to complete the blasting and anti-reflection operation on low-permeable thick ...

specific Embodiment

[0041] A method for increasing permeability of low-permeable coal seams in deep-hole directional pre-splitting blasting combined with the four-way vertically slit pipe 2 and the drug roll 4 and the four-way vertically slit pipe 2 and the water bag 5 for charge at intervals.

[0042] like figure 1 , figure 2 As shown, taking 3 blastholes as an example, the specific steps include:

[0043] Step 1: Construct large-diameter deep blast holes in the coal seam by adopting conventional operation methods.

[0044] Under normal circumstances, the coal seam is thick and has low air permeability, so the gas exists in the coal seam in the state of adsorption. The construction of deep blast hole 1 can release the gas in the deep coal seam and increase the air permeability of the coal seam, which is beneficial to improve the gas in the thick coal seam. Extraction effect. In general, the diameter of blast hole 1 for large-diameter deep hole blasting is 60-80mm, the depth of blast hole 1 i...

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Abstract

The invention discloses a method for increasing the permeability of a low-permeability coal seam by means of deep-hole directional pre-splitting blasting. The method includes constructing large-diameter blast holes in the high-gassy low-permeability coal seam in a conventional operation mode; using four-way perpendicular joint-cutting pipes as blasting explosive charging pipes and water bag charging pipes; arranging the four-way perpendicular joint-cutting pipes loaded with explosive cartridges and the four-way perpendicular joint-cutting pipes loaded with water bags at intervals to fill explosive into the blast holes, and detonating the explosive in each blast hole by double detonating fuses to complete operation for increasing the permeability of the low-permeability thick coal seam. Longitudinal cut joints are respectively circumferentially formed at a 0-degree position, a 90-degree position, a 180-degree position and a 270-degree position of each four-way perpendicular joint-cutting pipe. The method has the advantages that crack networks which are communicated with one another can be formed in the coal seam after blasting, the permeability of the low-permeability high-gassy coal seam can be improved, a gas extraction effect is guaranteed, the gas extraction efficiency is high, and gas disaster accidents can be prevented to a certain degree.

Description

technical field [0001] The invention relates to a gas pumping discharge pre-splitting blasting construction technology for permeability enhancement of low-permeable coal seams, in particular to a method for improving permeability of low-permeability coal seams by deep hole directional pre-splitting blasting. Background technique [0002] More than half of the existing coal mines are high gas and coal and gas outburst mines. Gas generally exists in coal seams in two forms, that is, adsorption state and free state. In the amount of gas stored in coal seams, the amount of adsorbed gas usually accounts for more than 90%, while the amount of free gas is only about 10%. When the coal seam is mined, the gas trapped in the coal seam is continuously released with the disturbance of the coal seam mining, and its harm is mainly manifested in three aspects: gas suffocation, gas explosion, coal and gas outburst. According to statistics, in my country's coal mine accidents, more than 40...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B43/263
Inventor 岳中文许鹏杨仁树郭洋薛华俊王茂源张绍民吴亚磊侯丽冬
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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