Fixedly coupled three-shaft servo seepage pressure chamber containing gas coal thermal flow

Abstract

The invention discloses a fixedly coupled three-shaft servo seepage pressure chamber containing gas coal with thermal flows. In the invention, a test cavity with a downward opening is arranged in an upper seat, a through hole is arranged in axial direction on the upper seat above the test cavity, a lower seat is provided with a step through hole in axial direction, the upper seat is installed on the lower seat, the lower seat and the upper seat are respectively provided with an oil inlet and discharge opening and an evacuation hole, a pressurization piston rod is movably sleeved in the axial through hole of the upper seat, and the axial lead of the pressurization piston rod is provided with an air inlet through hole of which the lower end part is provided with an air inlet bee hole; a support shaft which is right opposite to the pressurization piston rod is arranged in the axial through hole of the lower seat, and the axial lead of the support shaft is provided with an exhaust through hole of which the end part is provided with an exhaust bee hole; and a guiding device which can guide a shaft of the pressurization piston rod and the upper seat is arranged in the test cavity, and a sensor wiring head which is connected with the outside is arranged on the lower seat in the test cavity. The invention has simple structure and high measuring accuracy in the test process.

Description

Technical field: [0001] The invention belongs to the field of test devices, and in particular relates to a gas-containing gas-containing coal seepage test research and deformation and failure characteristics research of gas-containing coal in the seepage process under different ground stresses, different gas pressures, and different temperatures. Coal heat-fluid-solid coupled three-axis servo seepage pressure chamber. technical background: [0002] During the production process of the mine, the excavation engineering destroys the balance of the stress field of the original rock and the balance of the original gas pressure, forming the stress redistribution and gas flow of the surrounding rock mass. Coal seam gas (coal bed methane) permeability is a physical parameter that reflects the difficulty of gas seepage in coal seams, and is also an important parameter in gas seepage mechanics and engineering. The shrinkage of coal matrix, coal seam burial depth, coal body structure ...

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Problems solved by technology

[0007] Although the seepage experimental devices designed and developed by the above units have advanced the study of seepage mechanics to a certain extent and deepened the understanding of coal seam gas migration mechanism, there are still some shortcomings: 1. The above experimental devices The factors affecting the permeability considered are relatively single, and there is no device that comprehensively considers the stress, gas pressure, temperature influence and deformation monitoring. Therefore, the tests carried out cannot completely simulate the environment in which the actual coal seam gas seepage is located; 2. Most of the inflation system is point inflation, that is, the gas is not uniformly inflated at the place where the pressure head is in contact with the test piece, so that the gas cannot flow through the test piece uniformly. 3. Most coal and rock deformation monitoring uses strain gauges, and the coal and rock deformation data are not accurate enough, especially the radial deformation; 4. Gas flow is mostly measured by the drainage method, and it is inevitable that there will be gas leakage and inaccurate readings , and the measurement process is cumbersome

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