Determination of cut-off wall cost efficiency at Motronivskyi pit mining

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Authors:

B.Yu.Sobko, Dr. Sc. (Tech.), Prof., orcid.org/0000-0002-6872-8458, National Mining University, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.V.Lozhnikov, Cand. Sc. (Tech.), Assoc. Prof., orcid.org/0000-0003-1231-0295, National Mining University, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract:

Purpose. The economic efficiency definition of cut-off walls in rocks at the flooded Motronivskyi mining site of Malyshevskyi deposit taking into account the environmental aspects of the problem.

Methodology. For determination of possible technological solutions to reduce the inflow of groundwater into the pit used, methods of analysis and systematization were used. While selecting the indexes of evaluation to establish the effectiveness of cut-off walls in rocks analytical method was used. Determination of the mining and preparatory work volume for construction of tranches for placing waterproof materials was performed by graphic method. Substantiation of rational application of cut-off walls in rocks at Motronivskyi mining site of Malyshevskyi deposit was made using techno-economic analysis.

Findings. Analysis of modern technological solutions aimed at reducing the volume of inflow of groundwater into the pit was conducted. Method for determining an application field for cut-off walls at a flooded mining pit which takes into account the cost of draining the pit and decrease in the environmental damage to the environment is developed. Technical and economic performance of buildings cut-off wall at Motronivskyi pit mining that allows evaluating the technology effectiveness was set.

Originality. Dependence of the required economic effect at the construction of cut-off walls in rocks on the inflow of groundwater into the pit for the geological and hydrogeological conditions at mining Motronivskyi pit is determined.

Practical value. Methods for determining an application area of cut-off walls at mining flooded pits allows estimating the cost efficiency of using cut-off walls in rocks at mining flooded fields, taking into account mining-geological and hydrogeological conditions of occurrence.

References.

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2. Bätz, K. D. Efficient drainage at Vattenfall Europe’s opencast lignite mines in Lusatia. Vattenfall Europe [pdf], рр. 15‒17. Available at: <http://www.kaeser.sk/sub/kaeser.sk/images/Perfect%20Partnership%20-%20Mining%20&%20Conservation.pdf> [Accessed 28 March 2017].

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5. Bruce, D. A., Dreese, T. L., Harris, M. C. and Heenan, D. M., 2012. Composite Cut-Off Walls for Existing Dams: Theory and Practice. In: Proceedings of the Fourth International Conference on Grouting and Deep Mixing. DOI: 10.1061/9780784412350.0102.

6. Du, Y. J., Fan, R. D., Liu, S. Y., Reddy, K. R. and Jin, F., 2015. Workability, compressibility and hydraulic conductivity of zeolite-amended clayey soil/calcium-bentonite backfills for slurry-trench cutoff walls. Engineering Geology, 195, рр. 258‒268.

7. Schwank, S., 2016. Cut-off Wall Technologies in Mining. In: C., Drebenstedt, M., Paul, eds. Mining Meets Water – Conflicts and Solutions. Freiberg: Medienzentrum of TU Bergakademie Freiberg [pdf], рр. 468‒477. Available at: <https://www.imwa.info/docs/imwa_2016/IMWA2016_Schwank_162.pdf> [Accessed 25 April 2017].

8. Lu, W., Zhao, D. and Wang, Y., 2015. The Effect of Excavation Dewatering and Supporting Structure Deformation on Soil Settlement. Electronic Journal of Geotechnical Engineering, 20(9), рр. 3955‒3964.

9. Jasperse, B., Siepi, M. and Bruce, D. A. Excavated and backfilled cut-offs. Available at: <http://www.crcnetbase.com/doi/pdfplus/10.1201/b12974-5> [Acce­ssed 15 March 2017].

10. Pavlichenko, А. V. and Kroik, А. А., 2013. Geochemical assessment of the role of aeration zone rocks in pollution of ground waters by heavy metals. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 5, pp. 93–99.

11. Prokopenko, V. I. and Litvinov, Yu. I., 2017. Environmental oriented imperative of developing the opening technology and excavation of horizontal fields. Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, 2, pр. 51‒57.

12. Haidin, A.M., Sobko, Yu. and Laznikov, A.M., 2016. Mining flooded deposits of titanium ores:Monograph. Dnipro: Lithographer.

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ISSN (print) 2071-2227,
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