Authors: V.A. Portola, A.A. Bobrovnikova, S.V. Kovalev, E.A. Kirenberg

Title of the article: Application of temperature and gas surveys for detection and location of points of endogenous fires at seam outcrops of the abandoned mine

Year: 2023, Issue: 3, Pages: 79-90

Branch of knowledge: 2.8.6. Geomechanics, destruction of rocks by explosion, mine aerogasdynamics and mining thermophysics

Index UDK: 622.822

DOI: 10.26730/1999-4125-2023-3-79-90

Abstract: The article presents the results of a study of spontaneous combustion seats that arose at the outcrops of coal seams of an abandoned mine. The development of endogenous fires was facilitated by the caves on the surface formed during the excavation of coal, as well as the coal-bearing rock used to fill the caves. To detect and locate seats of endogenous fires, temperature survey of rocks to a depth of 1.0-1.5 m was used, as well as measurement of radon fluxes from the surface with sensors filled with activated carbon, and the concentration of carbon monoxide in rocks. Conducted temperature and gas surveys made it possible to identify spontaneous combustion seats with a temperature of more than 500 °C. The concentration of carbon monoxide in the anomaly reached 1.0%, which is a danger to human life. The radon fluxes from the earth's surface above the spontaneous combustion seats reached 1418 mBq/(m2∙s), which significantly exceeds the background values equal to 20-50 mBq/(m2∙s). On the heated earth's surface, radon fluxes decrease, which can be explained by a decrease in gas sorption by activated carbon. Gas anomalies were also found above non-burning seams, which can be explained by the displacement of gases upon reaching the surface. It has been established that the combination of temperature and gas surveys makes it possible to increase the efficiency of locating the seats of underground fires.

Key words: spontaneous combustion of coal endogenous fire outcrops of coal seams temperature survey gas survey carbon monoxide radon

Receiving date: 06.04.2023

Approval date: 15.06.2023

Publication date: 30.06.2023

CITE DOWNLOAD