Coal rock gas adsorption-expansion deformation optical meter

Abstract

The invention discloses an adsorption-expansion deformation optical measuring instrument of a coal rock gas. A heater and a base are arranged inside an experimental cylinder; a lateral support body is fixed at the rear end of the base; a loading plate is arranged at the front end of the base and is fixed with the rear end of a pressure rod; the front end of the pressure rod is connected with a lever device outside the experimental cylinder; an exhaust sub-system is connected with a bleeder hole in the wall of the experiment cylinder externally; an aeration sub-system is connected with an aeration hole externally; an opening at the upper end of the experiment cylinder is sealed by a seal cover; a transparent lens is embedded in the middle part of the seal cover; an observation device is arranged just above the transparent lens. According to the adsorption-expansion deformation optical measuring instrument of the coal rock gas, the expansion and shrinkage effect and the gas seepage characteristics of a coal body adsorbing and desorbing the gas are quantitatively observed by simulating a real multi-field (a force field, a confining pressure field and a temperature field) environment of an experiment body and using a prepared high-magnification microscope system in the working process, and the expansion stress under the deformation limit condition is calculated.

Description

technical field [0001] The invention belongs to the technical field of gas seepage, and in particular relates to an indoor observation device for the simulation of coal-rock gas adsorption-expansion deformation process under multi-field conditions. Mesomechanical tests were carried out on the whole process of deformation of coal and rock under different temperature and force conditions. Background technique [0002] 92% of my country's coal production is underground mining, and the average depth of underground mining is nearly 500m. The occurrence and mining conditions of underground coal seams are becoming more and more complicated. Accounting for 44% of the total number of mines in the country. With the increase of coal mining depth, a large number of shallow low-gas mines will gradually transform into high-gas mines, and the number of high-gas mines is increasing year by year. At the same time, gas is also a greenhouse gas. Methane is 7 times more destructive to the ozon...

AI Technical Summary

Problems solved by technology

Due to the high requirements on the observation surface of the optical microscope, the device uses a cylindrical specimen with a small observation surface range, and the microscope can only perform left and right swing observations, resulting in a small observation range, and it is impossible to track the destruction process of a specific crack and perform a certain range of inspection. Secondly, the gas pressure of the device is low, which is quite different from the actual mine; moreover, from the existing research results, the reliability of its observation needs to be further improved

Another example is a gas-containing coal rock mesomechanics test system disclosed in Chinese invention patent CN 101354355 B, which uses dynamic microscopic observation and acoustic emission monitoring to obtain the change image of the surface crack of the test piece and the image reflecting the internal structure of the test piece. Acoustic emission characteristics of the damage evolution process, but the system is complex, and the cost of experiment and maintenance is high

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