Abstract
Abstract In order to detect coal and gas outburst disasters by means of electric exploration technology, the characteristics of gas adsorption/desorption electrical response were studied. The law of resistivity variation of different coal samples was investigated under different gas pressures with the aid of a self-built real-time test system of coal resistivity during gas adsorption/desorption. In addition, the mechanism of coal resistivity variation was studied. The research results indicate that coal resistivity decreases during gas adsorption and increases during gas desorption, but generally it cannot return to the initial value. Gas influences coal resistivity through a variety of mechanisms. In the gas adsorption process, coal resistivity decreases under the combined effect of surface energy decline, skeleton expansion, free gas pressure and adsorption swelling stress. In addition, as the gas pressure rises, the resistivity varies in a wider range. The coal resistivity shares the relation of y = a + b ln(x + c) with gas pressure and the relation of y = ax + b with the content of adsorbed gas. This study lays a foundation for the application of electrical prospecting technology to gas hazard prediction and provides technical support for safe production in coal mines.
Highlights
In order to detect coal and gas outburst disasters by means of electric exploration technology, the characteristics of gas adsorption/desorption electrical response were studied
In the gas adsorption process, coal resistivity decreases under the combined effect of surface energy decline, skeleton expansion, free gas pressure and adsorption swelling stress
The coal resistivity shares the relation of y = a + b ln(x + c) with gas pressure and the relation of y = ax + b with the content of adsorbed gas
Summary
Abstract: In order to detect coal and gas outburst disasters by means of electric exploration technology, the characteristics of gas adsorption/desorption electrical response were studied. Yang et al [18] conducted gas adsorption experiments on briquette coal and raw coal from different mining areas, and tested the law of resistivity variation in the gas adsorption process under 0.8 MPa of gas pressure. Chen et al [19] carried out a gas-containing coal extrusion test, which is a coal gas desorption process, including coal body loading, gas filling, and sudden pressure relief In this way, the law of resistivity change is obtained. The real-time test system of coal resistivity during gas adsorption/desorption was established to test and analyze the variation law and mechanism of different coal samples under different gas pressures. The study lays a foundation for the prediction of gas disasters by means of an electric exploration technology and improves application and development of coalfield geophysical exploration technology
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