Fluid-solid-heat coupling triaxial servo percolation device for gas-contained coal

Abstract

The invention discloses a fluid-solid-heat coupling triaxial servo percolation device for gas-contained coal, comprising a lifting stand, a hydraulic servo control system, an axial loading device mounted at the top of the lifting stand and a triaxial pressure chamber connected with the lower end of the axial loading device. A thermostatic water tank is arranged below the triaxial pressure chamber; a movable worktable is arranged above the thermostatic water tank; the lower end of the triaxial pressure chamber is arranged on the movable worktable; heating tubes are arranged in the thermostatic water tank; and a water inlet valve, a water drain valve and a water-bath circulating water pump are arranged outside the thermostatic water tank and are communicated with the thermostatic water tank. In the hydraulic servo control system, an axial compression loading oil pump is communicated with an oil inlet and an oil outlet by a pipeline, and a peripheral compression loading oil pump is communicated with an oil intake / drain hole by a pipeline. The fluid-solid-heat coupling triaxial servo percolation device for gas-contained coal can carry out the research of gas-contained coal percolation tests in states, such as different terrestrial stresses, different gas pressures, different temperatures, and the like and the distortion and failure characteristics of the gas-contained coal in a percolation process.

Description

Technical field: [0001] The invention belongs to the field of test devices, and in particular relates to a device capable of studying gas-containing coal seepage tests under different ground stresses, different gas pressures, and different temperatures, as well as the deformation and failure characteristics of gas-containing coal in the seepage process. Heat-fluid-solid coupling three-axis servo percolation device for gas-containing coal. 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,...

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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 applied stress loading systems are manual. Therefore, the stress loading process cannot maintain a uniform speed, and its accuracy cannot be guaranteed. In addition, loading forms such as cyclic loading cannot be realized; 3. The inflation system is mostly point inflation, that is, between the pressure head and The place where the test piece contacts is inflated unevenly, so that the gas cannot flow through the test piece evenly. Therefore, there must be some errors in the measurement of the gas flow rate, which leads to inaccurate calculation of the permeability; 4. Most of the coal and rock deformation monitoring Using strain gauges, the deformation data of coal and rock is not accurate enough, especially the radial deformation; 5. The gas flow is mostly measured by the drainage method, which inevitably has gas leakage and inaccurate readings, and the measurement process is cumbersome; 6. The installation process of each device Basically rely on manual handling, inconvenient to operate

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