Assessment of the state of the rock mass around the crosscuts under additional deformation disturbances

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Authors:


S.M.Hapieiev, orcid.org/0000-0003-0203-7424, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.V.Skobenko, orcid.org/0000-0003-4606-4889, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

N.V.Khoziaikina*, orcid.org/0000-0002-4747-3919, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S.V.Podkopaiev, orcid.org/0000-0002-3258-9601, Donetsk National Technical University, Lutsk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

D.A.Chepiga, orcid.org/0000-0002-3331-9128, Donetsk National Technical University, Lutsk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


повний текст / full article



Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2024, (2): 032 - 037

https://doi.org/10.33271/nvngu/2024-2/032



Abstract:



Purpose.
Assessment of the level of disturbance of the stress state of the rock mass around the crosscut of the depth of 545 m when additional deformations occur during the mining of lower-lying coal pillars by southern longwalls of the k5 layer and assessment of this impact on operational production in the mining-geological and mining-technical conditions of Krasnolymanska mine.


Methodology.
Theoretical studies are based on the use of regulatory documents on the design of mining operations in coal mines and geomechanical models developed in accordance with the basic principles of solid mechanics, implemented in proven software products.


Findings.
As a result of the research, it has been proven that the mining-geological and mining-technical conditions of the stressed-strained state of the rock mass around capital workings at a depth of 545 are not critical for their stability. The ability to mine coal pillars at lower depths has been substantiated, and a minimum distance limit between research objects has been established, below which the fastening must be strengthened to ensure the stability of the crosscuts.


Originality.
For the first time, the stress-strain field in the rock mass around the basis workings has been studied as a result of the imbalance caused by previous mining during the excavation of underlying coal pillars under geological and technical conditions of Krasnolymanska mine based on geomechanical models. The regularity of the equivalent stress growth according to the Mohr-Coulomb criterion with a decrease in the distance between the research objects has been developed. Rational parameters of the technology for working out pillars are substantiated, under which the stress-strain state of the geomechanical system can be safely controlled.


Practical value.
The possibility of increasing the productive coal reserves within the field of the mine Krasnolymanska due to the safe mining of pillars around the basis inclines on the underlying levels is justified.



Keywords:
capital crosscuts, coal pillars, capital slopes, stress-strain state, regulatory framework, geomechanical models

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ISSN (print) 2071-2227,
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