Abstract
The safety factors for different variants of operation development were obtained, on the basis of which the technical and economic indicators were established and the most expedient way of restoration of dump operations in conditions of the formed landslide was chosen. The solutions were proposed for the external dump No 2 of the Central Ore Mining and Processing Enterprise (COMPE), that allow to continue its future operation. When working in the conditions of the formed landslide, three variants of the further dump operation are modeled: the first one - with landslide removal and unloading of the upper dump horizons, the second one - without landslide removal and involvement of disturbed lands in land allotment, the third one - with the landslide loading. Based on the built sections of the dump and defined physical and mechanical properties, the stability factors were obtained for different options of the operation development, which made it possible to determine the appropriate option to eliminate the effects of the dump slide deformations. As a result of the calculations, the cost flows for each of the proposed options of the formation of the end contour of the dump No 2 are determined.
Highlights
Practice and scientific research show that the overburden rocks during the development of deep open mines are stored in external dumps, which occupy large areas
From the point of view of technological decisions the third option is most effective, which allows to place in addition volumes of overburden rocks both in a loading embankment (385.14 thousand m3), and to form a dump with a height within design contours providing the stability of the dump
As a result of the research of the dump No 2 of the Petrovsky open mine of the PJSC “Central Ore Mining and Processing Enterprise (COMPE)” the following was established: the north-eastern side of the dump is currently stable, so the further description applies to the south-western side; cracking in the rock mass of the dump at the time of the study mainly occurs in the northern part; water migration is superficial
Summary
Practice and scientific research show that the overburden rocks during the development of deep open mines are stored in external dumps, which occupy large areas Their systematic expansion and considerable distance from the open mines lead to a significant increase in the cost of field development as a whole. When storing overburden rocks in such conditions, it should be accounted that the weight of the dump placed in the hollows effect the base and can lead to deformation of the sides Such processes can be facilitated by the presence of ground and surface water, which moisten the rocks of the dump base. The formation of such deformations, as a rule, occurs outside the land allotment of the enterprise. There are unforeseen costs to eliminate the effects of deformation, which in difficult economic conditions and reducing demand for iron ore concentrate is unacceptable
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