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Test research method for gas-containing coal infiltration law under conditions of vibration and unloading

A gas-fired coal-conditioning technology, which is applied in the field of experimental research on gas-containing coal-rock penetration law under vibration unloading conditions, can solve the problems of complex test process and failure to consider the influence of vibration, and achieve the effect of convenient test operation process

Inactive Publication Date: 2017-07-28
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above studies have considered the influence of different mining methods on the permeability characteristics of gas-containing coal rocks, the influence of vibration has not been considered, and the test process is complicated.

Method used

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  • Test research method for gas-containing coal infiltration law under conditions of vibration and unloading
  • Test research method for gas-containing coal infiltration law under conditions of vibration and unloading
  • Test research method for gas-containing coal infiltration law under conditions of vibration and unloading

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Embodiment 1

[0031] The present invention provides a method for testing the permeability of gas-containing coal and rock under vibration unloading conditions. figure 1 It is implemented on the test device shown, the test device includes a triaxial pressure chamber 1, a loading device, a data measurement acquisition device, and a gas injection device, the test device also includes a disturbance device, and the disturbance device includes a disturbance rod 5, so The disturbance rod 5 is located in the middle of the upper head of the loading device, and the disturbance rod 5 is connected to the vibration exciter 6. The axial load and radial load are implemented by the loading device, the axial disturbance is implemented by the disturbance device, the gas is provided by the gas cylinder, and different gas supply pressures can be manually set, and the gas flow is set by the gas outlet pipeline. Digital electronic gas flow meter collection. The function of the data measurement collection device i...

Embodiment 2

[0037] The invention also provides a research method for vibration unloading test of gas-containing coal and rock, which also adopts such figure 1 As shown in the test device, the research method includes the following steps:

[0038] Step 1: Step 1: Process the coal and rock specimens, crush the original coal from the coal mine site of a mining company in Shanxi with a crusher, screen out 40-100 mesh coal powder, mix it with pure water and place it in 200t On the material testing machine, apply a forming pressure of 100MPa to form a standard briquette specimen of Φ50mm×100mm, and bake the prepared briquette specimen at 80°C for 24 hours to prepare three groups of 15 coal and rock specimens, each of 5 One, the groups are [1], [2], [3], corresponding to the three mining methods of protective layer, top coal caving and no coal pillar;

[0039] Step 2: Stick the stress strain sensor on the surface of the coal and rock specimen and put it into the triaxial pressure chamber after puttin...

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Abstract

The invention provides a test research method for a gas-containing coal infiltration law under conditions of vibration and unloading. The method is implemented by test devices such as a triaxial pressure chamber, a loading device, a data measurement and acquisition device and a gas injection device. The test devices also comprise a disturbance device. The disturbance device comprises a disturbance rod. The disturbance rod is connected to a vibration exciter. The research method comprises processing a coal rock specimen so that a height-diameter ratio is 2: 1, pasting a stress-strain sensor to the surface of the coal rock specimen, sleeving the coal rock specimen with a heat shrinkable tube, putting the coal rock specimen into the triaxial pressure chamber, starting the gas injection device, filling the triaxial pressure chamber with gas until the coal rock specimen forms adsorption balance so that real on-site occurrence cases of the coal rock specimen is simulated, applying axial load, radial load and axial disturbance to the coal rock specimen according to preset parameters until the specimen is damaged, monitoring stress and strain values and a gas flow in the process to acquire a gas-containing coal infiltration law under different vibration and unloading conditions.

Description

Technical field [0001] The invention relates to the technical field of coal mining, in particular to an experimental research method of gas coal and rock permeability under vibration unloading conditions. Background technique [0002] The geological environment of deep coal resources is complex, the permeability of coal seams is low, the ground stress and gas pressure are huge, and it is easy to cause gas power accidents when mining coal resources. The unmined original coal and rock is in a state of stress balance under the action of in-situ stress and tectonic stress. Engineering disturbances such as mining cause the load on the coal and rock mass to change in time and space, and the internal stress of the coal and rock mass is redistributed. Unrecoverable new cracks continue to expand, eventually forming through cracks, which make the entirety lose integrity, which are manifested as deformation, destruction, and instability in the macroscopic view; mining disturbances also chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N1/28
CPCG01N15/0826G01N1/28
Inventor 宋洋祝白茹王华庆吴贝宁董泽李征
Owner LIAONING TECHNICAL UNIVERSITY
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