Experimental device for gas permeation under complex conditions

Abstract

The invention discloses an experimental device for gas permeation under complex conditions. The experimental device is characterized by comprising a sealing loading box, a permeation test piece, a loading device, an oil pressure sealing system, a gas supplying system and a gas balancing system, wherein the loading device is used for loading the permeation test piece to enable the permeation test piece to be in a predetermined stress state; under the assistance of the oil pressure sealing system, a first pressure chamber comprises a rectangular frame, force transmission columns, side baffle plates and the outer side surface of the permeation test piece, and a second pressure chamber comprises the side baffle plates and the inner side surface of the permeation test piece; under the effect of gas pressure difference, gas in the first pressure chamber gradually permeates into the second pressure chamber, so that the permeation law of the gas around holes can be researched. The experimental device can be used for enabling coal and rock masses to be in a stress state similar to field conditions, and the influence of the breaking situations of the coal and rock masses around the holes in the permeation law can be considered, so that the experimental device has great significance on the research on the permeation, absorption and resolution law of the gas in the coal and rock masses around roadways under the complex conditions.

Description

Technical field [0001] The invention relates to the study of the gas permeation law in the coal seam during coal mining, in particular to a gas permeation experiment device under complicated conditions. Background technique [0002] The stress and strain state of coal and rock mass and the development law of cracks have a very significant influence on its permeability. For example, after the excavation of the coal seam roadway, the original stress and strain state is broken, and obvious stress concentration occurs around the excavation space. The stress concentration of the surrounding rock will not only close part of the original fissures, but also induce more new fissures. The continuous expansion of the new fissures will make the coal more fragmented and form a loose circle around the roadway. Under the influence of the loose circle, a large amount of gas in the coal body around the roadway overflows, which can easily cause the roadway gas to exceed the standard and cause a g...

AI Technical Summary

Problems solved by technology

[0004] At present, there is no experimental device specially used to study the law of coal gas permeability around the roadway, and the conventional gas permeability test device, whether it is triaxial or uniaxial, is to process the test piece into a cylindrical or cubic shape. Putting it in a uniform stress state, and then testing its permeability, can only simulate a uniform stress field, and fails to consider the influence of complex factors such as stress concentration caused by roadway excavation and surrounding rock fragmentation on the permeability law

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