Experiment device for gas permeation around round hole

Abstract

The device discloses an experiment device for gas permeation around a round hole. The experiment device is characterized by comprising a sealing load box, a permeation specimen, an oil pressure sealing system, a gas supply system and a gas balance system. On the basis that a permeation rule of coal and rock mass around the round hole can be considered to be axisymmetric, the device takes one part for an experiment so as to reflect the overall permeation property of surrounding rocks. Relative to a whole-section experiment device, the device can carry out a large-scale experimental study. The device enables the specimen to be in a stress state similar to that under site conditions through simple loading and can consider the influence of breaking conditions of the coal and rock mass around the round hole to the permeation rule. The device has the characteristics of simple structure and low experiment cost. The device has important meaning for studying gas permeation, adsorption and analysis rules in the coal and rock mass under the particular stress condition around the round hole.

Description

technical field [0001] The invention relates to the research on the gas permeation law in the coal seam during the coal mining process, in particular to an experimental device for gas permeation around a circular hole. Background technique [0002] For high-gas coal mines, gas drainage must be carried out before the coal seam is mined. The gas drainage method currently used is generally to drill drainage holes into the coal seam. According to the permeability characteristics of the coal seam, it is of great significance to select the appropriate drilling diameter, drilling depth and row spacing. In addition, coal mining roadways are generally excavated in coal seams, and a large amount of gas in the coal body around the roadway overflows, which can easily cause gas to exceed the standard. Therefore, it is necessary to conduct in-depth research on the law of gas penetration around the roadway. The gas drainage hole is a standard circular structure, while the roadway can be c...

AI Technical Summary

Problems solved by technology

The conventional gas permeation test device, whether it is a triaxial test or a uniaxial test, is to process the test piece into a cylindrical or cubic shape, and put it under a uniform triaxial or uniaxial stress state by loading it, and then test its permeability. rate, it can only simulate the uniform stress field, and does not take into account the stress concentration caused by the excavation of the hole and the influence of the surrounding rock fragmentation

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