Mining Institute of the Ural Branch of the Russian Academy of Sciences, Perm, Russia

I. A. Morozov, Researcher, Candidate of Engineering Sciences, imorozov.work@yandex.ru
V. N. Toksarov, Senior Researcher, Candidate of Engineering Sciences
I. L. Pankov, Head of laboratory, Associate Professor, Candidate of Engineering Sciences

EuroChem-VolgaKali, Kotelnikovo, Russia

I. V. Polyakov, Chief Engineer at Technical Directorate, Candidate of Engineering Sciences

The paper presents the investigation results on the rock pressure-induced events in a deep potash mine. The field observations in salt rocks over the period from 2018 to 2023 are summarized. The mathematical modeling results are described. The presence of salt rocks leads to intensive deformation of rock mass which encloses underground openings. This shows up as floor heaving, sidewall rock failure and roof stratification in roadways. The analysis of the field observations shows that the lowest displacement rates are characteristic of roadway roofs. This is explained by the peculiarities of the geological structure of enclosing rock mass. From the video sounding data, it is found that the roof stratification occurs in salt rocks or at the salt–anhydrite–dolomite interface contact, as a rule, during the 1st year of operation, and is localized within the effective length of rock bolts. According to the mathematical modeling data, stratification can occur already at the time of heading within a distance of 0.5 m from the interface with rocks. In such conditions, given the absence of rock bolting, it is expectable that salt strata will collapse with time. The post-limit deformation zones in the sidewall rock mass are not less than 1.5 m in size and substantially grow with time. The results obtained are intended to substantiate the methods of roadway support in the conditions of a deep potash mine and lithology typical of the Gremyachinsk deposit.
The study was supported by the Ministry of Science and Higher Education of the Russian Federation, Registration No. 122012000403-1, and by the Russian Foundation for Basic Research, Grant No. 20-45-596011.

1. World Population Prospects 2022: Summary of Results : Report. New York : United Nations, 2022. 52 p.
2. Svidzinskiy S. A., Muzalevskiy M. M., Kovalskiy F. I. Gremyachinsk deposit of sylvinite. New Data on Geology of Salt-Bearing Basins in the Soviet Union : Composite Book. Moscow : Nauka, 1986. pp. 204–219.
3. Andreev G. N., Ivankin A. V. Structural peculiarities of the Kungur sedimentary from highresolution seismic exploration data. Tekhnologii seismorazvedki. 2008. No. 3. pp. 89–93.
4. Akhlestina E. F., Moskovsky G. A. Mesozoic–Cenozoic oversalt deposits from the gremyachkinskoye sylvinite field. Izvestiya Saratovskogo universiteta. Ser.: Nauki o Zemle. 2008. Vol. 8, No. 2. pp. 50–55.

5. Morozov I. A., Udartsev A. A., Pankov I. L. Laboratory deformation testing of salt rocks from the Gremyachinsk and Upper Kama deposits. GIAB. 2020. No. 10. pp. 16–28.
6. Pashkevich M. A., Danilov A. S. Ecological security and sustainability. Journal of Mining Institute. 2023. Vol. 260. pp. 153–154.
7. Litvinenko V. S., Petrov E. I., Vasilevskaya D. V., Yakovenko A. V., Naumov I. A. et al. Assessment of the role of the state in the management of mineral resources. Journal of Mining Institute. 2023. Vol. 259. pp. 95–111.
8. Hongpu Kang, Jinghe Yang, Xianzhi Meng. Tests and analysis of mechanical behaviours of rock bolt components for China’s coal mine roadways. Journal of Rock Mechanics and Geotechnical Engineering. 2015. Vol. 7, Iss. 1. pp. 14–26.
9. Manchao He, Guolong Zhu, Zhibiao Guo. Longwall mining “cutting cantilever beam theory” and 110 mining method in China—The third mining science innovation. Journal of Rock Mechanics and Geotechnical Engineering. 2015. Vol. 7, Iss. 5. pp. 483–492.
10. Asanov V., Evseev A., Toksarov V., Beltiukov N. The assessment methodology of chamber mining system elements sustainability. Problems of Complex Development of Georesources : Proceedings of VII International Scientific Conference. 2018. Vol. 56. 02006. DOI: 10.1051/e3sconf/20185602006
11. Baryakh A. A., Evseev A. V., Lomakin I. S., Tsayukov A. A. Operational control of rib pillar stability. Eurasian Mining. 2020. No. 2. pp. 7–10.
12. Toksarov V. N., Morozov I. A., Beltyukov N. L., Udartsev A. A. Deformation of underground excavations under conditions of the Gremyachinsk potassium salt deposit. GIAB. 2020. No. 7. pp. 113–124.
13. Beltyukov N. L. In-situ measurements of rock mass stresses based on the Kaiser effect : Dissertation of Candidate of Engineering Sciences. Perm, 2018. 159 p.
14. Sinha S., Chugh Y. P. Validation of critical strain technique for assessing stability of coal mine intersections and its potential for development of roof control plans. Journal of Rock Mechanics and Geotechnical Engineering. 2018. Vol. 10, No. 2. pp. 380–389.
15. Baryakh A. A., Samodelkina N. A. Rheological analysis of geomechanical processes. Journal of Mining Science. 2005. Vol. 41, Iss. 6. pp. 522–530.
16. Hadiseh Mansouri, Rassoul Ajalloeian. Mechanical behavior of salt rock under uniaxial compression and creep tests. International Journal of Rock Mechanics and Mining Sciences. 2018. Vol. 110. pp. 19–27.
17. Hao Tang, Dongpo Wang, Zhao Duan. New Maxwell Creep Model Based on Fractional and Elastic-Plastic Elements. Advances in Civil Engineering. 2020. Vol. 2020. DOI: 10.1155/2020/9170706
18. Titov B. V. Development and analysis of long-term strength determination method for salt rocks in compression : Dissertation ... of Candidate of Engineering Sciences. Berezniki, 1983. 248 p.
19. Baryakh A. A., Konstantinova S. A., Asanov V. A. Rock salt deformation. Yekaterinburg : UrO RAN, 1996. 204 p.
20. Amusin B. Z., Linkov A. M. Applying variable modules in solving a class of problems of linearly hereditary creep. Izvestiya Akademii Nauk SSSR. Mekhanika tverdogo tela. 1974. No. 6. pp. 162–166.
21. Junbao Wang, Qiang Zhang, Zhanping Song, Yuwei Zhang. Creep properties and damage constitutive model of salt rock under uniaxial compression. International Journal of Damage Mechanics. 2019. Vol. 29, Iss. 6. pp. 902–922.