Determining conditions of using draglines in single-tier internal dump formation
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- Category: Content №6 2020
- Last Updated on 22 December 2020
- Published on 22 December 2020
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Authors:
Ye.K.Babets, orcid.org/0000-0002-5613-9779, Scientific-research Mining Institute of the Kryvyi Rih National University, Kryvyi Rih, Ukraine, 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, email: 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, email: shustov.o.o@nmu
O.O.Anisimov, orcid.org/0000-0001-
O.O.Dmytruk, orcid.org/0000-0001-6311-6252, Dnipro University of Technology, Dnipro, Ukraine, email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (6): 005 - 014
https://doi.org/10.33271/nvngu/2020-6/005
Abstract:
Purpose. The scientific and practical task of the study is to establish the dependences of the safe distance of dragline excavators on the height of a single-tier internal dump of the overburden rocks and the level of its flooding, taking into account the physical and mechanical properties of rocks.
Methodology. To achieve these goals, the following research methods were used: computer modelling using Slide software to build the most stressful sliding surfaces of the dumped rock mass. The calculations were performed in manual and automatic search modes for the most stressed (weak) sliding surface on several calculated sliding surfaces. The obtained data of calculations of the width of the prism of a possible landslide were analyzed and their dependence on the height of the single-tier dump and the water level in the open pit space was established by the method of least squares. The formula for calculating the value of the distance from the safety embankment to the axis of movement of the excavator is obtained using the cosine theorem and a number of trigonometric identities.
Findings. Using the Slide software complex the parameters of the width of the prism of a possible landslide at safety factors 1.2 and 1.0 were calculated and their dependences on the height of the dump and the level of its flooding with water were established, which allowed establishing effective models of dragline excavators for different conditions. The formula for calculating the distance from the axis of movement of the excavator to the safety embankment taking into account the parameters of the dragline excavator and the width of the pit for unloading haul trucks is proposed.
Originality. It is established that when the slope of the dumped rock mass is flooded with water, the physical and mechanical properties of the tier sole change, and the stability of the slope begins to decrease, and the width of the prism of a possible landslide increases. After water flooding of the slope reaches the critical value at the level of 1/5.2 from the total height of the tier slope, there is an increase in stability and a decrease in the width of the prism of a possible landslide due to increasing the influence of water retaining forces in the open pit space. The slope acquires the greatest stability at its maximum flooding by water.
Practical value. The established dependences allowed determining the safe distance for installation of mining equipment, and also allowed making a choice of an appropriate model of the excavator for carrying out works on formation of a single-tier dump. The recommended height of the tier of the overburden rock when forming it with a dragline excavator is not more than 100-150 m, or higher only in case of flooding of the slope with water. It was found that dragline excavators EK 6.5-45, EK 14-50 and EK 10-50 are effective for a tier height of 100 m regardless of the level of flooding. For the formation of a dump tier with a height of 150 m, the effective use of excavators EK 11-70 and EK 20/90 is possible when at least 70 and 50 m of a slope, respectively, is flooded with water. For slopes of single-tier dumps of the overburden rocks with the height of more than 150200 m dragline excavators EK 6.5-45, EK 14-50 and EK 10-50 are effective when the thickness of non-flooded part of a slope is 7075 m, the dragline excavator EK 11-70 9095 m, dragline excavator EC 20/90 100110 m.
Keywords: internal dump, single-tier dump, deep flooded open pit, stability of the open pit sides, physical and mechanical properties of rocks, dragline excavator, safety factor
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