Investigation into crown stability at underground leaching of uranium ores

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Authors:

M.I.Stupnik, Dr. Sc. (Tech.), Prof., State Institution of Higher Education “Kryvyi Rih National University”, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V.O.Kalinichenko, Dr. Sc. (Tech.), Prof., orcid.org/0000-0002-1938-2286, State Institution of Higher Education “Kryvyi Rih National University”, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

M.B.Fedko, Cand. Sc. (Tech.), Assoc. Prof., orcid.org/0000-0003-4169-7425, State Institution of Higher Education “Kryvyi Rih National University”, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

О.V.Kalinichenko, Cand. Sc. (Econ.), Assoc. Prof., orcid.org/0000-0002-9138-9271, State Institution of Higher Education “Kryvyi Rih National University”, Kryvyi Rih, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. Determination of influence of various factors on crown stability at underground block leaching of uranium ores.

Methodology. Mathematical modeling applying the finite element and analytical methods is used to investigate into the impact of the ore body dip angle and crown workings on changes in the crown stress-strain state and stability. On this basis, dependencies of the above factors’ influence on the crown stability are determined enabling their adequate consideration when specifying the appropriate crown thickness. Laboratory studies allow estimating influence of the reagent used at block leaching of uranium ores on their hardness for the purposes of determining safe crown parameters.

Findings. The dependencies of the ore body dip angle impact and the degree of crown disturbances caused by workings on crown stability as well as uranium ore hardness decrease resulted from application of the acid solution enable adjusting the appropriate crown thickness in determining safe parameters of the technology at the stage of the design work execution.

Originality. Scientific novelty consists in determining dependencies that consider the impact of the ore body dip angle and the degree of crown disturbances caused by workings on crown stability. For the first time, influence of the sulfuric acid solution used in underground block leaching of uranium ores on changes in their hardness has been studied. Comprehensive consideration of the effect of these factors and the determined dependencies enables specifying safe thickness of crowns and ensures their integrity.

Practical value. Possibility of adjusting crown thickness considering the ore body dip angle, the degree of disturbance caused by workings, and the acid solution impact will allow specifying the appropriate crown thickness at the stage of designing. This will allow avoiding possible failure of crowns caused by negative impacts of the above factors and ensuring safety of works.

References.

1. GP “UkrNIPIIpromtekhnologii, 2014. Instructions for substantiating safe and stable parameters of stopes at underground mines of SE “VostGOK”. Zheltye Vody.

2. Babets, Ye. K., Sakovych, V., Syrotik, S. and Tsary­kovskyi, V., 2010. Determination and control of permissible dimensions of structural units of iron ore mining systems. Instructions for use. Kryvyy Rih: DP “NIGRI”.

3. Khomenko, O. E. and Tsenzhav, L., 2013. Technology of development of uranium deposits in Mongolia by the method of borehole underground leaching. National Mining University. Zbirnik naukovyh prat., 42, pp. 74‒80.

4. Ahrens, V. Zh., ed., 2010. Physico-chemical geotechnology: Monograph. Moscow: MSU Publishing House.

5. Stupnik, N. I., Kalinichenko, V. A., Fedko, M. B. and Mirchenko, E. G., 2013. Influence of the stress-strain state of the rock massif on the technology of breaking uranium ores. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2, pp. 11‒16.

6. NIGRI GUVZ KNU, 2012. Instructions for determining rock stability in mining at uranium deposits. Krivoy Rog: “NIGRI GUVZ KNU”.

7. Kuz’menko, A., Lozynskyi, V., Saik, P., Petlo­va­nyi, M., Sai, K. and Malanchuk, Ye., 2018. Analytical Research of the Stress-Deformed State in the Rock Massif around Faulting. International Journal of Engineering Research in Africa, 35, pp. 77‒88.

8. Khomenko, О., Sudakov, А., Malanchuk, Z. and Malanchuk, Ye., 2017. Principles of rock pressure energy usage during underground mining of deposits. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2, рр. 35–43.

9. Kaplenko, Yu. P. and Tsarikovskiy, V. V., 2005. Impact of the rock strain state and mining and geological conditions on exposure parameters and stope shapes. Ore mining, 88, pp. 21‒24.

10. Stupnik, N. I., Kalinichenko, V. A. and Kalinichenko Ye. V., 2018. The study of the stress-strain state of the massif in mining uranium at Vostgokdeposits. Innovative development of resource-saving technologies for mining. Multi-authored monograph. Sofia: Publishing House “St. Ivan Rilski”.

11. Stupnik, M. I., Kalinichenko, V. O., Fedko, M. B., Malinovskyi, Yu. O., Kalinichenko, O. V., Pukhalskyi, B. M. and Kryvokhin, B. I., 2018. Defining the crown thickness at underground leaching of uranium ores in mining by vertical double blocks. Bulletin of Kryvyi Rih National University,46, pp. 3–9.

12. Bondarenko, V. I., Kovalevskaia, I. A. and Vivcharenko, A. V., 2014. Increasing stability of workings in schistous soft rock massif. Ugol Ukrainy, 2, pp. 8‒11.

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ISSN (print) 2071-2227,
ISSN (online) 2223-2362.
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