NorNickel’s Polar Division, Norilsk, Russia:

V. P. Marysyuk, Chief Geotechnical Engineer—Director of Geodynamic Safety Center, Candidate of Engineering Sciences, marysyukvp@nornik.ru

NorNickel, Moscow, Russia:
G. V. Sabyanin, Head of Mining and Processing Management at Production Technology Department, Candidate of Engineering Sciences

Center for Geomechanics and Mining Problems, Saint-Petersburg State Mining University, Saint-Petersburg, Russia:
A. A. Andreev, Leading Engineer
M. A. Vilner, Engineer, Post-Graduate

A bed of rock salt in Komsomolsky Mine occurs in sedimentary strata enclosing cage and skip shafts. When water enters rock salt via underground excavations, boreholes and fractures, rock salt can dissolve and wash out, and voids appear in rock mass. Voids at the lining and rock interface should be eliminated so that never re-appear or grow during shaft operation. Materials used to eliminate voids should ensure stable mechanical linkage both with enclosing rocks and lining. Assessment and analysis of geomechanical processes induced by leaching need monitoring of deformations in a shaft. To this effect, one of the simplest and most informative methods is arrangement of an observation station directly in the shaft lining to measure varying distances between check points. The article briefly describes activities aimed to eliminate voids using different composition grouts. From the analysis of monitoring data, the deformation mechanism is described, and the interaction between different deformation stages and grouting steps is determined.
The authors appreciate participations of experts M. P. Sergunin, I. A. Shishkina, A. K. Ustinov, V. V. Tsatskin, V. S. Orlov.

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