Modeling of the stress-state longwall face during coal mining with the technology of roof management complete drop and stowing

Underground mining of coal deposits has a negative impact on all components of the environment. When developing a coal deposit, it is coal mining technology that determines the scale and consequences of the negative impact. Changes in the stress-strain state of the geo-environment can lead to a violation of the hydrological regime, increased gas emission from the host rocks, the initiation of gas-dynamic processes. Choice of roofing management technology — as a geotechnological method of natural and technical system management determines the environmental friendliness of coal mining and creates safety conditions. The article deals with the technology of roofing control during coal production. For this purpose mathematical modeling and analysis of stress-strain state of the bottomhole part of the coal bed for the conditions of S.M. Kirov is performed. As a result of modeling, two technologies of roof control were analyzed — complete caving and stowing. For the worked out clearing leaves filled with either caving rocks or stowing material, there are characteristic unloading zones in the massif to be worked and overworked, as well as pressure reference zones, which fall on the parts of the pillars associated with the lava. It was found out that the application of the stowing technology creates conditions for minimization of gravitational stresses in the geoenvironment, as well as significantly reduces the potential energy of form change.

Keywords: mathematical modeling, stress-strain state, SSS, coal seam, longwall face, full caving technology, technology with backfilling, backfilling.
For citation:

Mazina I.E., Stel’makhov A.A., Mullagalieva L.F. Modeling of the stress-state longwall face during coal mining with the technology of roof management complete drop and stowing. MIAB. Mining Inf. Anal. Bull. 2020;(6-1):99-106. [In Russ]. DOI: 10.25018/02361493-2020-61-0-99-106.

Acknowledgements:
Issue number: 6
Year: 2020
Page number: 99-106
ISBN: 0236-1493
UDK: 622.504
DOI: 10.25018/0236-1493-2020-61-0-99-106
Article receipt date: 11.03.2020
Date of review receipt: 14.04.2020
Date of the editorial board′s decision on the article′s publishing: 20.05.2020
About authors:

Mazina I.E.1, chief engineer, e-mail: edik-mazin@yandex.ru;
Stelmakhov A.A.1, Cand. Sci. (Eng.), Associate Professor of the Department «Safety and Ecology of Mining Production»;
1 National university of science and technology «MISIS», Russia;
Mullagalieva L.F., associate professor, Karaganda State Technical University, Kazakhstan.

 

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