JUSTIFICATION OF SAFE PARAMETERS FOR RIB PILLAR IN PIT WALL ABOVE THE DVOINOI MINE

The authors estimate the stress state of rock mass beyond the boundary of an open pit, in its northern part, above the Dvoinoi mine. The local veins of quartz with gold and silver mineralization contain large mineral reserves while mining is only possible with the underground method. The mathematical modeling of the stress state change in rock mass is carried out in the variant of the bottom-up cut-and-fill stoping toward the open pit mine with formation of a protective rib pillar in the pit wall. The estimate by the Mohr–Coulomb criterion shows that, given the discussed parameters of mining, the pit benches and the rib pillar will not fail, even in case of possible damage of the pit wall rock mass under dynamic effect of blasting or influence of natural weathering in the conditions of severe climate. The rib pillar is stable, and the minimum safety factor of the pit wall exceeds the rated value of 1.4. For this reаson, extraction of mineral reserves from the pit wall rock mass can be implemented at the reduced height of the rib pillar in the pit wall. The possible boundaries of the rib pillar are plotted in the mining layout.


For citation: Ovcharenko O. V., Aynbinder I. I. Justification of safe parameters for rib pillar in pit wall above the Dvoinoi mine. MIAB. Mining Inf. Anal. Bull. 2019;(7):5-12. [In Russ]. DOI: 10.25018/02361493-2019-07-0-5-12.

Keywords

Hybrid surface/underground mining technology, cut-and-fill stoping, pitwall rib pillar, stability, safe parameters, rock mass stress state, physical and mechanical properties of rocks, mathematical modeling.

Issue number: 7
Year: 2019
ISBN: 0236-1493
UDK: 622.272:622.274
DOI: 10.25018/0236-1493-2019-07-0-5-12
Authors: Ovcharenko O. V., Aynbinder I. I.

About authors: I. I. Aynbinder, Dr. Sci. (Eng.), Professor, Head of Department, e mail: geoexpert@yandex.ru, O. V. Ovcharenko, Cand. Sci. (Eng.), Senior Researcher, e mail: geoexpert@yandex.ru, Institute of Problems of Comprehensive Exploitation of Mineral Resources of Russian Academy of Sciences, 111020, Moscow, Russia. Corresponding author: O. V. Ovcharenko, e mail: geoexpert@yandex.ru.

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