VNII Galurgii JSC, Perm, Russia

M. V. Skopinov, Director of Geological Science
V. V. Tarasov, Head of Laboratory, Candidate of Engineering Sciences, Vladislav.Tarasov@uralkali.com
P. V. Nikolaev, Leading Engineer

VNII Galurgii JSC, Perm, Russia¹ ; Perm State National Research University, Perm, Russia²

V. N. Aptukov^1,2, Head of Department, Doctor of Engineering Sciences, Professor

Potassium mines strengthen shafts with concrete and mixed-type concrete cast iron lining with exclusively low-grade concrete (grades M200 and M300). Operation of mine shafts induces various discontinuities in lining, which necessitates routine or basic repair to be carried out. The authors examine prospects of concrete shaft lining in salt rock mining. The scope of the analysis embraces the usage pattern of concrete lining in salt rocks which possess pronounced rheological properties, and demonstrates its advantages and shortcomings. Efficiency of this material in shaft lining in salt rock masses is evaluated. It is shown that low-grade concrete lining in long-operated mine shafts in salt rock mass provides insufficient load-bearing capacity. The tolerance time of shaft lining (stability categories II–III) is correlated with the lining thickness, concrete grade and the rock pressure value from mathematical modeling. The article describes some variants of using high-strength bulk concrete for vertical shaft lining in salt rock mass. The research findings exhibit capacities of high-strength concrete lining in salt rocks and set ideas for the future investigations in this field of science. The results allow a conclusion on the prospects of concrete lining in mine shafts in salt rocks. The proposed designs of high-strength concrete lining offer an efficient replacement for expensive cast iron concrete lining.

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18. Solovev V. A., Aptukov V. N., Vaulina I. B. Support of Mining Workings in Saliferous Rocks. Novosibirsk : Nauka, 2017. 264 p.
19. Konstantinova S. A., Kramskov N. P., Solovev V. A. Some Problems of Rocks Mechanics as Applied to Processing of Yakutian Diamond Deposits. Novosibirsk : Nauka, 2011. 223 p.
20. Zhao X., Deng L., Zhou X., Zhao Y., Guo Z. A primary support design for deep shaft construction based on the mechanism of advanced sequential geopressure release. Processes. 2022. Vol. 10, Iss. 7. ID 1376.
21. Öge İ. F. Field evaluation of flexible support system with radial gap (FSRG) under a squeezing rock condition in a coalmine development. Geomechanics and Geophysics for Geo-Energy and Geo-Resources. 2020. Vol. 6, No. 3. DOI: 10.1007/s40948-020-00175-9