GEOMECHANICAL SUBSTANTIATION OF DEEP-LEVEL MINING AT KUKISVUMCHORR DEPOSIT

The geomechanical substantiation results of Kukisvumchorr deposit’s deep levels mining in conditions of high tectonic stresses acting are represented in the paper. In the result of look-back analysis the technological factors, which negatively affect on stability of workings and rock mass at all, were determined. The basic principles, mining method and technological parameters of +90 m level mining are determined. The regional and local measures which provide the relief of significant part of rock mass are suggested.
The multivariate numerical modeling of rock mass stress-strain state with simulation of the level reserves consequent stoping is carried out by finite element method in three-dimensional statement with using the Sigma GT software, which was developed in Mining Institute of the Kola Science Centre of the Russian Academy of Sciences. The main geological, geomechanical and mining factors are taken into account in model of the deposit. The zones of compressive stress concentration and stress relief in rock mass are defined. Minimization of geodynamical risks is provided by cutting in vicinity of existing fault and by advanced mining in hanging wall of ore body using sublevel caving method. The optimal direction of shrink drifts is subparallel to ore body contact, that allows to localizing the stress concentration zone on underlying sublevel. The advantage of preparation work on the level using cross-cuts is shown and the parameters of advances which guaranty the reducing of rockburst hazard level during drifting and mining in protected zones are determined. The presented statements were included in «Mining regulations of Kirovskiy mine Kukisvumchorr deposit’s +90 m level».

Finite element model developed in the framework of the grant on the priority area of activities of the RSF «Conduct fundamental research and exploratory research by individual research groups» no 17-17-01302.
The studies have been supported by Apatit Company, the results have been included in the Procedural Rules for Mining at Level +90 m in Kirov Mine at Kukisvumchorr Deposit.

Keywords

Rock mechanics, stress-strain state, rockburst hazard, tectonic stresses, underground mining, numerical modeling.

Issue number: 4
Year: 2017
ISBN:
UDK: 622.831
DOI:
Authors: Kozyrev A.A., Semenova I.E., Avetisyan I.M.

About authors: Kozyrev A.A., Doctor of Technical Sciences, Professor, Deputy Director, e-mail: kozar@goi.kolasc.net.ru, Semenova I.E., Candidate of Technical Sciences, Leading Researcher, e-mail: innas@goi.kolasc.net.ru, Avetisyan I.M., Candidate of Technical Sciences, Researcher, e-mail: ivanavetisyan@yandex.ru, Mining Institute of Kola Scientific Centre of Russian Academy of Sciences, 184209, Apatity, Russia.

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