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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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.
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Property | Measurement | Unit |
Outer diameter | 48.0 | mm |
Wall thickness | 4.0 | mm |
The inside diameter of | 40.0 ~ 1500.0 | mm |
tensile | MPa | |
Particle size | Pa | |
strength | 10 |
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