Optimization of parameters of overworked mining gallery support while carrying out long-wall face workings

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Authors:

V.O. Sotskov, Candidate of Technical Science, National Mining University, Associate Professor of the Department of Underground Mining, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.

Yu.I. Demchenko, Candidate of Technical Science, Associate Professor, National Mining University, Associate Professor of the Department of Underground Mining, Associate Professor, Dnipro, Ukraine

S.V. Salli, Candidate of Technical Science, National Mining University, Associate Professor of the Department of Underground Mining, Dnipro, Ukraine

N.I. Dereviahina, Candidate of Technical Science, National Mining University, Assistant of the Department of Hydrogeology and Engineering Geology, Dnipro, Ukraine

Abstract:

Purpose. The goal is to reach optimization of the supporting system of the Eastern intermediate drift of “Stepna” mine of DTEK Mine Office “Pervomaiske” to ensure reliable and effective maintenance of working over the entire life.

Methodology. Investigation and consideration of the geological conditions of mining and mining and technical features of overworking a single mine working when developing the overlying seam; conducting of computational experiments to determine the stress-strain state of the rock mass and support systems construction; rationale for the recommended support system parameters considering the use of “deep” strengthening of rocks.

Findings. The stress-strain state of rock, rock pressure manifestation and condition of maintaining workings depending on mining and processing parameters are investigated. Studies have established the rate of their impact on the effectiveness of applying support system at overworked workings. Eventually we have developed and justified recommendations for changing the supporting system, considering the use of “deep” strengthening of rocks. With respect to the estimated steel yield strength, the main length if racks is loaded on the level of 85‒94 % and is in a pre-limit state.

Originality. It is to establish the characteristics of changes in the stress state of the rock mass and the degree of influence of the bearing pressure zone in front of the long-wall face onto the underlying area.

Practical value. We have developed recommendations for efficient and reliable supporting of the Eastern intermediate drift of “Stepna” mine of DTEK Mine Office “Pervomaiske” allowing the features of supporting of overworked workings.

References

1. Kovalevska, I., Vivcharenko, V. and Snigur, V., 2013. Specifics of percarbonic rock mass displacement in longwalls end areas and extraction workings. Annual Scientific-Technical Collection ‒ Mining of Mineral Deposits, pp. 29–34.

2. Sotskov, V. and Saleev, I., 2013. Investigation of the rock massif stress strain state in conditions of the drainage drift overworking. Annual Scientific-Technical Collection ‒ Mining of Mineral Deposits, pp. 197–202.

3. Fomichov, V., Sotskov, V. and Malykhin, A., 2014. Determination and analysis of the acceptable benchmark changes of the stress strain state of frame and bolt fastening elements of dismantling drift when approaching a working face. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 1, pp. 22–26.

4. Majcherczyk, T., Niedbalski, Z., Malkowski, P. and Bednarek, L., 2014. Analysis of yielding steel arch support with rock bolts. Journal of Mining Science, 59(3), pp. 641–654.

5. Li, Xuwei, Nemcik, J., Aziz, N., Mirza, A. and Rasekh, H., 2015. Modelling of Rebar and Cable Bolt Behaviour in Tension/Shear. In: 15th Coal Operators' Conference, pp. 175–181 [pdf]. Available at: http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2223&context=coal [Accessed 02 February 2017].

6. Lapko, V., Fomychov, V. and Pochepov, V., 2013. Bolt support application peculiarities during support of development workings in weakly metamorphosed rocks. Mining of Mineral Deposits. pp. 211–215.

7. Saik, P. B., Dychkovskyi, R. O., Lozynskyi, V. G., Malanchuk, Z. R. and Malanchuk, Ye. Z., 2016. Revisiting the Underground Gasification of Coal Reserves from Contiguous Seams. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 6, pp. 60–66.

8. Malkowski, P., Niedbalski, Z. and Majcherczyk, T., 2016. Roadway design efficiency indices for hard coal mines. Acta Geodynamica et Geomaterialia, 13(2), pp.  201‒211.

9. Sidorenko, A. A. and Ivanov, V. V., 2016. Underground mining of multiple seam of coal. ARPN Journal of Engineering and Applied Sciences, 11(7), pp. 4448‒4454. 

 

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ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
Journal was registered by Ministry of Justice of Ukraine.
Registration number КВ No.17742-6592PR dated April 27, 2011.

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