Abstract
Under the conditions of a combined mining system overburden is developed using a transport and non-transport technologies, specific costs for non-transport technology are lower than transport costs. The change in the non-transport bench height led to the redistribution of the volumes of transport and non-transport overburden. With an increase in the volume of non-transport overburden, the share of more expensive transport overburden is decreases, while the technical and economic indicators of the non-transport zone deteriorate due to an increase in re-excavation volumes. The change in the non-transport bench height affects the recasting ratio and the annual advance coal face line, which determine the cost of developing the overburden. This article presents the results of a study of the laws of change in the recasting ratio and the annual advance coal face line, depending on the non-transport bench height within a combined mining system of flat seam. The obtained patterns were established as a result of solving problems of substantiating typical excavation schemes of the direct dumping method and developing a mathematical model for identifying excavation schemes with the subsequent calculation of their technological indicators.
Highlights
The use of walking dragline excavators in open cast mining horizontal and gentle seams of mineral in certain mining conditions allows to reduce development costs [1-4] by compared with other types of single-bucket excavators, and give the possibility of using the developed space for internal dumps [5-8], which increases the environmental friendliness of production.With a mixed system of mining flat seams, which provides for a combination of transport method and direct dumping method the work requires the establishment of a rational ratio of relevant volumes of stripping work that would ensure cost minimization
To study the patterns of changes in the main technological indicators of the nontransport zone depending on the non-transport bench height under combined mining system, it is necessary to justify the structure of the excavation schemes allow you to calculate the performance of direct dumping method in a wide range of values non-transport bench height [12-15]
The mathematical model of the parameters and indicators of excavation schemes is based on a logical mechanism for identifying the structure of the scheme depending on the given non-transport bench height
Summary
The use of walking dragline excavators in open cast mining horizontal and gentle seams of mineral in certain mining conditions allows to reduce development costs [1-4] by compared with other types of single-bucket excavators, and give the possibility of using the developed space for internal dumps [5-8], which increases the environmental friendliness of production. With a mixed system of mining flat seams, which provides for a combination of transport method and direct dumping method the work requires the establishment of a rational ratio of relevant volumes of stripping work that would ensure cost minimization. Decision this task is relevant, in particular, when mining flat seams of the Leninsky and Yerunakovsky geological economic regions of the central Kuzbass [9-11]. To study the patterns of changes in the main technological indicators of the nontransport zone depending on the non-transport bench height under combined mining system, it is necessary to justify the structure of the excavation schemes allow you to calculate the performance of direct dumping method in a wide range of values non-transport bench height [12-15]
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