Method for fracturing and permeability improvement to shield coal road excavation by utilizing pulse detonation waves
A technology of detonation wave and coal roadway, which is applied in the field of using pulse detonation wave to cause fracturing and penetration enhancement to shield coal roadway excavation, can solve the problem of restricting the on-site application of coal seam fracturing and penetration enhancement measures, affecting the efficiency of coal seam and coal roadway excavation, and the difficulty of hydraulic fracturing direction. control and other issues, to achieve the effect of shortening the gas pre-extraction time, wide practicability, and strong destructive power
Active Publication Date: 2015-08-26
CHINA UNIV OF MINING & TECH
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Problems solved by technology
At present, commonly used coal seam fracturing and permeability enhancement measures include hydraulic cutting, hydraulic fracturing, deep hole loosening blasting, etc. Although some achievements have been achieved, there are still some limitations. It is difficult to cont...
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[0015] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0016] Such as figure 1 Shown, utilize the pulse detonation wave of the present invention to cause fracturing to shield the tunneling method of coal roadway, and tool step is as follows:
[0017] a. In the bottom pumping roadway 3, use the drilling rig to construct the detonation drainage borehole 4 to the coal seam 1 until the detonation drainage borehole 4 passes through the roof of the coal seam 2 at 0.5m and withdraw the drill;
[0018] b. Send the PVC casing 5 with the high-voltage electric pulse generator 6 on the top into the bottom of the detonation drainage borehole 4; the high-voltage electric pulse generator 6 is placed in the bottom pumping lane 3 through the cable 7 The explosion-proof switch 9 is connected to the explosion-proof console 8, and the cable 7 is built into the PVC casing 5;
[0019] c. Turn on the explosion-proof switch 9, charg...
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The invention discloses a method for fracturing and permeability improvement to shield coal road excavation by utilizing pulse detonation waves, and is suitable for quick excavation of a coal bed and a coal road with high gas and low permeability. The method comprises the following steps: firstly constructing a detonation extraction drill hole from a bed plate tunnel to the coal bed by utilizing a drilling machine, then sending a high-voltage electric pulse generator into the detonation extraction drill hole, controlling the high-voltage electric pulse generator to release the high-energy pulse detonation waves to the detonation extraction drill hole repeatedly through an anti-explosion control table, after a large number of fractures are formed in the coal body around the detonation extraction drill hole, connecting the detonation extraction drill hole into a gas extraction pipeline, and after the gas extraction reaches the standard, conducting the coal road excavation. According to the method, the coal body is subjected to high-energy fracturing by utilizing the pulse detonation waves, a fracture network is formed in the coal bed to provide passages for gas flow, the efficiency of penetrating a layer to drill a hole for coal bed gas pre-drainage is improved, the gas pre-drainage time is shortened, and quick coal road excavation is realized.
Description
technical field [0001] The invention relates to a method for using pulse detonation waves to create cracks and increase penetration to protect coal roadway excavation, and is especially suitable for underground coal mine high-gassy and low-permeability coal seam bottom pumping roads to penetrate layers and drill holes to protect coal roadway excavation. Background technique [0002] Most coal seams in my country generally have the characteristics of high gas and low gas permeability, and the gas extraction is difficult and efficient. Therefore, artificially increasing the permeability of the coal seam, increasing the permeability of the coal seam, and then improving the concentration and efficiency of gas extraction in the coal seam are the main measures to solve the problem of gas gushing and gas exceeding the limit in the process of coal roadway excavation. At present, commonly used coal seam fracturing and permeability enhancement measures include hydraulic cutting, hydra...
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Login to view more IPC IPC(8): E21F7/00E21B43/26E21D9/00
Inventor 林柏泉郭畅朱传杰闫发志邹全乐刘厅洪溢都姚昊
Owner CHINA UNIV OF MINING & TECH
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