VNII Galurgii JSC, Perm, Russia

V. V. Tarasov, Head of Laboratory, Candidate of Engineering Sciences, Vladislav.Tarasov@uralkali.com
O. V. Ivanov, Leading Engineer
P. V. Nikolaev, Leading Engineer

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

V. N. Aptukov^1,2, Chief Researcher, Doctor of Engineering Sciences, Professor

During vertical shaft sinking and construction of concrete lining, technological deviations of the lining from the design are often observed in the form of changes in the thickness of concrete, deviations of the shaft axis from the design position, and weakening of the physical and mechanical characteristics of rock mass. These factors are partially taken into account during lining design by introducing various correction factors, including safety factors, into the calculation. The calculations of the lining are usually carried out at its nominal (design) dimensions and at the preset (standard) physical and mechanical characteristics of rock mass. From the authors’ experience and literature sources, it is known that the identified deviations from the design solutions are due to the imperfections of the lining construction technology, lack of a proper control over sinking, and weakening of the mechanical properties of shaft-enclosing rock mass by drilling and blasting, which negatively affects the load-bearing capacity of lining. In this article, the main types of technological deviations are presented and analyzed, and the numerical modeling is performed to assess the time of non-repairable condition of shaft lining, taking into account the weakening factors (deviations). The modeling is performed in three dimensions, considering the elastoplastic deformations of the concrete lining and rock mass, as well as the creep deformations that develop in rock mass over time. It is shown that the presence of a number of weakening factors leads to a decrease in the service life of the concrete support and to the accelerated growth of fractured zones from the inner surface of the support to its outer (contact) surface.

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