Method and device for determining radon gas separation in load coal fracture process

A method of determination and coal-loaded technology, which is applied in fuel oil testing, material inspection products, etc., can solve problems in the preliminary test stage, and achieve the effects of improving test sensitivity, adjustable and controllable carrier gas, and rapid and accurate determination

Inactive Publication Date: 2014-12-03
HENAN POLYTECHNIC UNIV
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Problems solved by technology

Previous studies on the change of radon concentration in the process of coal-rock fracture provide a new way to predict coal-rock dyna

Method used

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  • Method and device for determining radon gas separation in load coal fracture process

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Embodiment Construction

[0027] Measuring device for radon gas release during the fracture process of loaded coal, such as figure 1 As shown, it includes a three-axis compression instrument. The three-axis compression instrument includes a pressure chamber 1 and a hydraulic cylinder 17 arranged above the pressure chamber 1. Side plate 19 forms. The pressure chamber 1 is provided with an upper pressure head 8, a lower pressure head 9 and a heat-shrinkable tube 7 vertically arranged between the upper pressure head 8 and the lower pressure head 9, and the upper pressure head 8, the lower pressure head 9 and the heat-shrinkable tube 7 together form a sample chamber; the lower part of the upper pressing head 8 is provided with a porous plate 4, and the upper part of the lower pressing head 9 is provided with a porous plate 5. The upper pressing head 8 protrudes upwards outside the top plate 2, and the hydraulic rod of the hydraulic cylinder 17 extends downwards and connects the top of the upper pressing h...

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Abstract

The invention relates to a method and device for determining radon gas separation in the load coal fracture process. The method comprises the following steps: (1) preparing a coal sample into a test piece, installing the test piece between an upper pressure head and a lower pressure head of a three-axis compressor, and arranging a heat shrink tube outside the test piece in a sleeving manner; (2) vacuumizing a sample chamber formed by the upper pressure head, the lower pressure head and the heat shrink tube in an enclosing manner, then continuously introducing carrier gas into the sample chamber; (3) after the coal sample test piece absorbs the carrier gas in a balanced manner, applying a confining pressure and an axial pressure to the test piece, starting the recording of an acoustic emission signal in the determining process; (4) opening an air outlet duct of the sample chamber, collecting gas released from the sample chamber, determining the content of radon in the gas; (5) closing the gas outlet duct of the sample chamber to ensure that the coal sample test piece absorbs the carrier gas again in the balanced manner, increasing the axial pressure; and (6) repeating the steps (4) and (5) until the test piece is damaged, and stopping the recording of the acoustic emission signal.

Description

technical field [0001] The invention relates to a test method and a device for studying the law of radon precipitation in coal bodies during the mining process of coal mines. Background technique [0002] The geological conditions of coal seams in my country are complex, and coal and rock outbursts, rock bursts, roof falls and other coal-rock dynamic disasters are serious, which have caused great harm to the safety of life and property of the country and people. As the mine goes deep, the ground stress and gas pressure increase, and the threat of coal and rock dynamic disasters such as coal and gas outburst and rock burst will become more serious. These disasters are closely related to the instability and failure of coal and rock mass. The process of coal rock mass rupture is accompanied by the dissipation of energy and the precipitation of radioactive elements, and radon (Rn) is an important manifestation. Relevant studies at home and abroad have shown that the change of ...

Claims

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Application Information

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IPC IPC(8): G01N33/22
Inventor 魏建平姚邦华徐向宇温志辉王登科李波李恩福
Owner HENAN POLYTECHNIC UNIV
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