Multi-coal-seam goaf group overlying strata fluid migration simulation experiment device and method

Abstract

The invention provides a multi-seam goaf group overlying strata fluid migration simulation experiment device and method, the experiment device simulates strata with different properties in a sealed glass frame by adjusting the mixture ratio of yellow sand, calcium carbonate, gypsum and water, and mica sheets are laid between the strata to realize layering of overlying strata; the gas-filled row columns are adopted to simulate the coal seam, and coal seam mining is simulated by drawing out the limiting baffle to excite the firing pin to pierce the gas-filled row columns. Extra formation pressure is simulated in a cylinder loading mode; fluid release points are arranged at different layers, and fluids with different properties are injected into the simulated goaf; the mining ventilation state of the lower coal seam and the fluid seepage field of the goaf are monitored through various sensors. According to the simulation device and method, similar material simulation can be carried out according to different mining depths, mining heights, key layer structures, coal seam inclination angles and other conditions, the multi-coal-seam goaf group overlying strata fluid migration law is obtained, and wide applicability is achieved.

Description

technical field [0001] The invention relates to the field of simulation experiment of mining overburden fluid migration, in particular to an overlying rock fluid migration simulation experiment device and method capable of simulating multi-coal seam goaf groups. Background technique [0002] Most of the mining areas in my country are coal seam group occurrence mining areas. At present, the mining of the shallow coal seam in the upper part has been completed, and the mining of the lower coal seam is gradually being transferred. The mining of the thick coal seam in the lower part has a large disturbance space and a wide range of cracks. Once it communicates with the goaf of the upper coal seam, it is very easy to cause the overlying fluids such as old empty water and CO to seep across the layer to the lower coal seam working face, causing damage to the mining of the lower coal seam working face. serious threat. The 8106 working face of Tongxin Coal Mine in Datong mining area ...

AI Technical Summary

Problems solved by technology

At present, the goaf fluid migration physical simulator is mainly used to simulate the mining of a single goaf. The shortcomings of this method or the areas that need to be improved are: (1) The simulation of coal seam mining by steel plate sinking can only realize Single working face mining cannot realize the simulation of overlying rock fluid migration under the condition of multi-coal seam goaf group; (2) it can only simulate horizontal coal seam mining, but cannot simulate the goaf fluid migration under inclined coal seam mining

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