Assessment of the influence of returned mines on aerological risks at coal mines

The results of assessing the impact of reused workings on aerological risks in coal mines are presented. With aimless development systems, in some cases access to longwalls becomes difficult, aerological risks increase, including the risk of gas contamination of the mining area. Aerodynamic aging of workings leads to an increase in specific aerodynamic resistance. With the reuse of workings, the processes of aerodynamic aging in them will intensify. It has been established that when re-using workings, the risk of gas contamination of the excavation area will be: for a U-shaped ventilation scheme — 0.2403 (1.27 times more than the initial value of the gas risk); for a Z-shaped ventilation scheme — 0.155 (1.6 times the initial value of the risk of gas pollution); for the Y-shaped ventilation scheme — 0.1244 (1.9 times the initial value of the risk of gas pollution). When designing works with reuse of mine workings, in addition to calculating the predicted values of aerological risk, taking into account the joint operation of ventilation, degassing and gas suction, it is necessary to take into account the risk of gas contamination of the excavation area. The article presents the results of the assessment of the aerological risk in the designed excavation areas. The greatest damage is caused by the reuse of workings for direct-flow ventilation schemes with dilution of hazards according to the sources of their entry into the air stream and with freshening of the outgoing stream.

Keywords: aerological risk, aerodynamic aging, reliability of mine ventilation systems, failure rate, aerodynamic resistance of workings, indicator of the predicted value of aerological risk, risk of gas pollution, reused workings.
For citation:

Balovtsev S.V., Skopintseva O.V. Assessment of the influence of returned mines on aerological risks at coal mines. MIAB. Mining Inf. Anal. Bull. 2021;(2—1):40-53. [In Russ]. DOI: 10.25018/0236-1493-2021-21-0-40-53.

Acknowledgements:
Issue number: 2
Year: 2021
Page number: 40-53
ISBN: 0236-1493
UDK: 622.831
DOI: 10.25018/0236-1493-2021-21-0-40-53
Article receipt date: 05.12.2020
Date of review receipt: 20.12.2020
Date of the editorial board′s decision on the article′s publishing: 01.02.2021
About authors:

Balovtsev S.V., Cand. Sci. (Eng.), Assistant Professor, Assistant Professor, NUST «MISiS», Moscow, Russia, е-mail: Balovcev@yandex.ru;
Skopintseva O.V., Dr. Sci. (Eng.), Professor, Professor, NUST «MISiS», Moscow, Russia, е-mail: skopintseva54@mail.ru.

For contacts:
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