HYDRO- AND GEOMECHANICAL CONDITIONS OF INTERNAL DUMPING IN A FLOODED OPEN PIT MINE

Feasibility of internal dumping in a mined-out flooded open pit under conditions of a recovering cone of depression of ground water is analyzed. During flooding and one-layer dumping, the working areas of loading points on the dump surface are subjected to deformation and landsliding, which makes it impossible to use the available excavation machinery: power shovel (EKG-4US) and walker (ESH-6/45). The engineering methods of estimating influence of flooding on slope stability are based on the theory of limit equilibrium applied to the specific ground conditions, including in situ observation data and modeling results. Based on the theoretical and empirical research findings, conditions of a slope slip wedge during internal dumping in a deep flooded open pit mine are determined. Using the results of the hydro- and geomechanical modeling of an impound dump on a special test bench, the researchers draw the conclusion of selecting a walker with a dumping radius not less than 100 m, capacities of which can come to an end prior to work completion. In view of expensiveness of powerful excavators, it is necessary to evaluate the technology of dumping in a deep flooded open pit mine in the controlled landslide mode. The lines of the further research and focus of the described scientific and technical problem are specified.

Keywords

Internal dump, flooded open pit mine, dumping, slope stability, hydrostatic weighing, hydrostatic pressure, slip wedge, ground water, depression surface.

Issue number: 6
Year: 2018
ISBN:
UDK: 622.271.3
DOI: 10.25018/0236-1493-2018-6-0-38-44
Authors: Nikolashin S. Yu., Nikolashin Yu. M., Kebal Ya. V.

About authors: Nikolashin S.Yu., Candidate of Technical Sciences, Assistant Professor, Saint-Petersburg University of State Fire Service of Emergency of Russia, 196105, Saint-Petersburg, Russia, e-mail: nicolashins_65@mail.ru, Nikolashin Yu.M., Doctor of Technical Sciences, Professor, Academic AMSU, Academy of Mining Sciences of Ukraine, Krivoy Rog, Ukraine, Kebal Ya.V., Graduate Student, Kryvyi Rih National University, 90865, Krivoy Rog, Ukraine.

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