Solov'ev V. A., Aptukov V. N. – Ural Research and Design Institute for Mineral Salt Production JSC, Perm, the Russian
Federation. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Kotliar E. K. – Uralkali PJSC, Berezniki, the Russian Federation. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
At Verkhnekamskoye deposit of potassium salts 16 shafts are exploited and 9 shafts are on the level of design and
construction. In the salt part of a vertical section exploited shafts are strengthened with cast iron liners or site concrete.
Not a single type of support can provide guaranteed safety of a mine working; if challenging conditions arise the support
crashes and a need arises to carry out complex repair works. Pliant layers, situated between rock mass and support have
come into operation as prevention measures under the construction of shafts at potassium deposits. According to
the results of testing five types of polystyrene foam, “Penopleks-krovlia” (“Penopleks-35”) polystyrene foam has come to
be used as a protective layer. At calculation with the use of the licensed software complex ANSYS 17.0 the fields of
horizontal displacement and circular stress have been detected. Time dependencies of pressure on concrete support
have been detected, together with circular stresses within concrete support, and degrees of shrinkage of pliable layer 0.3
and 0.4 m deep. Validity check has been performed of calculation model and the results of full-scale experiment on
straining in the course of time for the shaft no. 3 of a mine of the Third Solikamsk Potassium Mine Group.

Key words: salt rocks; carnallite rocks; shafts; concrete support with pliable layer; polystyrene foam; model validity.

REFERENCES
1. Soloviev V. A., Aptukov V. N. [Assessment of the effect of compression properties of deformation layers and
parameters of combined support on the stability of shafts in salt rocks]. Izvestiya vysshikh uchebnykh zavedenii. Gornyi
zhurnal – News of the Higher Institutions. Mining Journal, 2014, no. 7, pp. 43–47. (In Russ.)
2. Solov'ev V. A., Aptukov V. N., Kotliar E. K. [Geomechanical and technological aspects of developing shaft
constructions in salt rocks]. Gornyi zhurnal – Mining Journal, 2015, no. 11, pp. 24–28. (In Russ.)