Analog simulation experiment device and method for solid gas coupling of upper protective layer mining

Abstract

The invention discloses an analog simulation experiment device and method for solid gas coupling of upper protective layer mining. The device comprises an experiment box and a permeability testing system. The experiment box is arranged in a sealed mode, an organic glass plate and a steel plate on the experiment box are provided with a gas inlet hole and a testing hole corresponding to the gas inlet hole respectively, and a stress sensor of the experiment box is sequentially connected with a data collecting instrument and a computer. The permeability testing system is composed of an air compressor, a gas storage tank, a high-pressure rubber pipe, a branching unit, a check valve, a pressure gauge and an electronic flow meter. An inflation system is connected to an inflation hole in the experiment box, and the permeability testing system is connected to the testing hole of the experiment box. The experiment method includes the steps that firstly, a model is laid; secondly, an air impermeability test is conducted; thirdly, an experiment is conducted, and data are recorded. According to the analog simulation experiment device and method for solid gas coupling of upper protective layer mining, the change rule and the distribution characteristics of stress, deformation and permeability in mining underlying coal and rock masses can be measured, the operation process is simple, effects are clear and visual, the testing period is short, and convenience is provided for studying protective layer mining.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a solid-gas coupling similar simulation experiment device and an experiment method for upper protective layer mining. Background technique [0002] Coal is the main energy source in my country, accounting for about 70% of the primary energy for a long time. According to the forecast of the International Energy Agency (IEA), by 2030, coal will still account for 60% of my country's total energy consumption. With the extension of coal seam mining to the deep part, the outburst risk of coal seam in the mine is further enhanced, and some shallow coal seams that are not outburst gradually turn into outburst coal seams after entering the deep part. China has become the most serious coal and gas outburst disaster in the world. The frequency and intensity of gas outburst disasters in China are the highest in the world. At present, the characteristics of coal seams in most mining are...

AI Technical Summary

Problems solved by technology

Due to the needs of engineering practice, the pressure relief mining technology of the protective layer has been applied in the coal seam group mining area, but the basic research on the relevant pressure relief theory still lags behind the engineering application, especially the evolution characteristics of the coal permeability and the crack expansion and penetration after the pressure relief mining The mechanism is still unclear, which has seriously affected the application effect of pressure relief mining technology in protective layers

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