Abstract
The seepage velocity and temperature externally manifest the changing structure, gas desorption and energy release that occurs in coal containing gas failure under loading. By using the system of coal containing gas failure under loading, this paper studies the law of seepage velocity and temperature under different loading rates and at 1.0 MPa confining pressure and 0.5 MPa gas pressure, and combined the on-site results of gas pressure and temperature. The results show that the stress directly affects the seepage velocity and temperature of coal containing gas, and the pressure and content of gas have the most sensitivity to mining stress. Although the temperature is not sensitive to mining stress, it has great correlation with mining stress. Seepage velocity has the characteristic of critically slowing down under loading. This is demonstrated by the variance increasing before the main failure of the samples. Therefore, the variance of seepage velocity with time and temperature can provide an early warning for coal containing gas failing and gas disasters in a coal mine.
Highlights
With the depth of coal mining increasing, the geostress, gas pressure and gas content increase, and the mechanism of a coal and gas outburst caused by stress and gas becomes complicated
Energies 2017, 10, 1246 outburst and gas outburst that occurred in Hullera Vasco Leonesa coal mine in Spanish which caused injuries and fatalities, Toraño et al [12] established a system that monitors the law of gas pressure, desorption velocity and other parameters
Using a self-developed testing system for gas containing coal samples, this paper examines the seepage velocity and temperature of samples under different loading rates, and uses the results of on-site gas pressure and temperature measurements to explain the experimental results
Summary
With the depth of coal mining increasing, the geostress, gas pressure and gas content increase, and the mechanism of a coal and gas outburst caused by stress and gas becomes complicated. Energies 2017, 10, 1246 outburst and gas outburst that occurred in Hullera Vasco Leonesa coal mine in Spanish which caused injuries and fatalities, Toraño et al [12] established a system that monitors the law of gas pressure, desorption velocity and other parameters. Based on these monitoring results, they ensured the desorption velocity as the optimal index to predict outburst. Gas pressure and coal properties are different in different coal seams, the sensitivity of forecasting indicators is different This causes inaccuracy in some predictions, especially when the index uses only few parameters. The study offers a basic reference for further study of coal and gas outburst prediction using the coupled method of gas and temperature
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