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Approbation of the technology of efficient application of excavator-automobile com-plexes in the deep open mines

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Category: Contens №4 2020

Last Updated on 05 September 2020

Published on 30 August 2020

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Authors:

S. K. Moldabayev, orcid.org/0000-0001-8913-9014, Satbayev University, Almaty, the Republic of Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A. A. Adamchuk, orcid.org/0000-0002-8143-3697, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A. A. Toktarov, orcid.org/0000-0003-2578-8642, Satbayev University, Almaty, the Republic of Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Ye. Aben, orcid.org/0000-0003-3909-3200, Satbayev University, Almaty, the Republic of Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O. O. Shustov, orcid.org/0000-0002-2738-9891, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (4): 030-038

https://doi.org/10.33271/nvngu/2020-4/030

повний текст / full article

Abstract:

Purpose. To establish the feasibility of implementing the technology for working out the overburden rock ledges and ore mining by transverse panels in steeply sloped layers within a single open mine until the end of its operation.

Methodology. In substantiating the spatial position of the staged contours of steeply sloped layers in round-shaped open mine fields and their optimization, the following methods were used: Bellman’s analytical and optimal control methods in dynamic programming in combination with an integrated mining and geological information complex basing on a digital model of an iron ore field. To study the reserves of increasing the productivity of excavator-car complexes, when switching to the technology of working out pit banks with transverse panels in steeply inclined layers from top to bottom with a shift of the open pit spacing, methods of correlation and regression analysis were used.

Findings. Based on the distinction between the concepts of the near-contour and deep zones of deep open mines and the introduction of two new parameters for the relationship between the contours of the ore field and the dynamics of the open mine formation, a method of justification of the spatial position of the staged contours of steeply sloped layers in round-shaped open mine fields has been developed. Compared to the dead-end turn of automotive dumping trucks according to the used technology for working out ledges with longitudinal panels, the transition to working them out with transverse panels with a width of 60–80 m, with a loop turn of the automotive dumping trucks for loading will increase the productivity of excavators at least by 25–30 %, which, along with a decrease in the spacing of the open mine sides, compensates the intensity of the ore field overburden from top to bottom within the boundaries of steeply sloped layers even with a significant lag of overburden operations.

Originality. The transition to the technology of working out ledges with transverse panels in steeply sloped layers is the only solution if the overburden lag exceeds the current design overburden volumes when mining approaches the limit contour of the open mine surface. In the studied extremely deep iron ore open mine, even when the design volume of the current (annual) overburden operations increases by more than 3 times, this technology allowed reducing the overburden lag by 25 % and shortening the period for the development of the ore production capacity from 8 to 5 years. A mathematical model has been created to optimize the contours of working out stages for steeply sloped fields when working out ledges with transverse panels in steeply sloped layers, in which the functional contains the fourth-order non-linearity in relation to the required value – the width of the panels. Automation of calculations for optimizing the parameters of the design of the working open mine sides in the dynamics of the development of mining operations with such a formulation of the task by non-linear programming method is provided by splitting it into two successively solved optimization tasks by the dynamic programming method on the basis of Bellman’s optimality principle.

Practical value. The staged contours of steeply sloped layers, constructed using the method of substantiating the spatial position, for an existing iron ore open mine, after optimization of steep sides using Bellman’s optimal control method, will enable one to obtain a real mining operation schedule when implementing the technology for working out ledges for rock overburden and ore mining with transverse panels in steeply sloped layers within a single open mine. It is established that despite the increase in the volume of rock mass in the worked out panel from top to bottom, it is possible to level significantly the volumes of lag of the overburden operations and to shorten the period of the development of production capacity for a strategic iron ore mining facility. Analysis of the mining operation schedule shows that the greatest difficulties arise in the first three years – 2020–2022. The current overburden ratio at mining of 15 million tons of ore will vary from 8.9 to 8.7 tons/ton. However, taking into account the existing overburden lag place, it can be reduced by almost 25 %. A two-fold decrease in rock overburden volumes in 2023 will increase the ore mining by 30 % to 19.5 million tons, and in 2024, by 60 %, respectively, and develop a design capacity of 24 million tons.

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