Device for testing fatigue damage permeability improvement of coal body by cyclic adsorption expansion deformation
A technology of fatigue damage and adsorption expansion, which is applied in the direction of measuring devices, using repeated force/pulsation force to test the strength of materials, instruments, etc., can solve the problem that the pressure and frequency of the inlet end cannot be quantitatively controlled, and achieve simple structure and avoid leakage , the effect of high precision pressure control
Inactive Publication Date: 2019-12-31
CHINA UNIV OF MINING & TECH
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Problems solved by technology
[0003] At present, similar test equipment directly uses gas cylinder pressure to pulse crack the coal body, which cannot quantitatively control the pressure and frequency of the inlet end, and requires manual complex operations
Method used
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Embodiment 1
[0042] A test device for improving the permeability of coal body fatigue damage by cyclic adsorption expansion deformation, the test method includes the following steps:
[0043] ①Sample loading: first dry the coal core, put the coal core in an oven at 45°C for 24 hours; determine the complete area on the surface of the coal core, smooth it with sandpaper, and stick the strain gauge 14 on the A total of 4 groups are pasted on the surface of the coal core, and the strain gauge lead 15 and the strain gauge 14 lead are welded together; the coal core is wrapped by a rubber sleeve 13 and placed in the pressure chamber 12, and the rubber sleeve 13 isolates the pressure chamber High pressure liquid within 12;
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Abstract
The invention discloses a device for testing the fatigue damage permeability improvement of a coal body by cyclic adsorption expansion deformation. According to the device, pressure is applied to a coal rock core through an axial pressure plunger loading pump and an annular pressure plunger loading pump; an air pressure control system generates circulating air inlet end pressure with a specific frequency, waveform and pressure at the front end of the coal rock core; and a monitoring system collects gas pressure at the front end and rear end of the sample, sample matrix strain and axial displacement data. The sealing performance of the test device is good, so that the leakage of liquid and gas in a long-term test process can be avoided; a computer program is adopted to control front-end gasinlet end pressure, and therefore, gas inlet end pressure of a complex type and a specific duration can be achieved, pressure control precision is high, manual operation is not needed, automatic measurement and recording of a long-term test are achieved, and the permeability improvement rule of the coal body by cyclic adsorption expansion deformation under different schemes is effectively measured; and by means of the real-time measurement of sample matrix strain and axial displacement, the quantitative calculation of the degree of the damage of the sample caused by the cyclic adsorption expansion deformation is realized.
Description
technical field [0001] The invention relates to a device for coal body fatigue damage, in particular to a test device for increasing the penetration of coal body fatigue damage by cyclic adsorption expansion deformation, and belongs to the technical field of coal rock mechanics testing. Background technique [0002] As the gas drainage efficiency of most coal seams in my country is low, increasing the gas permeability of coal seams by adopting various technical means is the most effective way to improve the gas drainage efficiency. At present, active measures to enhance the air permeability of coal seams are usually: loose blasting, hydraulic fracturing, hydraulic cavitation, hydraulic slotting, hydraulic punching, etc. The impact stress wave used in loose blasting will cause damage to the coal body, but the strength of the soft coal body is low, and the propagation resistance of the shock stress wave is large, so the penetration enhancement range is small; hydraulic fractur...
Claims
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IPC IPC(8): G01N3/36
CPCG01N3/36G01N2203/0005G01N2203/0019G01N2203/0044G01N2203/0046G01N2203/0073G01N2203/0682
Inventor 魏明尧刘应科康建宏刘春
Owner CHINA UNIV OF MINING & TECH
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