Impact of static loading from mining equipment on the bench stability in hard rocks

DOI: https://doi.org/10.30686/1609-9192-2023-3-116-121
Читать на русскоя языкеA.S. Kalyuzhny
Mining Institute Kola Science Centre of the Russian Academy of Sciences, Apatity, Russian Federation
Russian Mining Industry №3 / 2023 р. 116-121

Abstract: Most of the enterprises applying open-pit mining method at deposits face challenges of pit wall steepening when approaching the pit wall to the final position or reducing productivity. The main task when increasing the angle of pit slope is to determine its stability. One of the ways to steepen the open-pit wall is to increase the slope angle of benches composing the open-pit wall. The bench stability is primarily determined by its physical properties and structural uncertainty. The higher the strength properties of rocks, the steeper the slope angle formed in these rocks can be. The "Rules of stability..." provide for the possible accounting the loads from mining equipment when assessing the stability, but this possibility is provided for the calculation of bench stability of open-pits and cuts, formed by semi-hard and dispersed rocks, dumps formed from clay or semi-hard rocks and (or) from a mixture of clay and hard rocks. At the same time, it is of interest to assess the impact of static loading from the located mining transport equipment in a stationary state on the stability of the benches located in hard rocks. It is shown that the load from the track dozer scraping the berms has an impact of no more than 6-7% for a distance of about 15 m from the top crest of a 30-meter long bench with a slope angle of 80° to the edge of the track, which is generally insignificant for maintaining bench stability. The minimum value of the safety factor of the bench with the load from the BELAZ-75306 mining dump truck is at a distance of 8 to 10 m from the top crest to the edge of the wheel. That is, at this distance the mining dump truck has the maximum impact. At 30 m distance from the bench’s top crest, mining dump truck has no impact on the bench stability. The maximum impact of the dump truck on the stability is 22 to 25%.

Keywords: open pit, open pit wall, slope, bench, stability assessment, safety factor, weakening surface, Morgenstern-Price, SVSlope

For citation: Kalyuzhny A.S. Impact of static loading from mining equipment on the bench stability in hard rocks. Russian Mining Industry. 2023;(3):116–121. https://doi.org/10.30686/1609-9192-2023-3-116-121

Article info

Received: 11.04.2023

Revised: 05.05.2023

Accepted: 14.05.2023

Information about the authors

Anton S. Kalyuzhny – Research Associate, Department of Geomechanics, Mining Institute of the Kola Science Centre of the Russian Academy of Science; Apatity, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

References

1. Spirin V.I., Livinskiy I.S., Hormazabal E. Risk-based optimization of open pit slopes. Izvestiya Tulskogo gosudarstvennogo universiteta. Nauki o zemle. 2019;(3):317–331. (In Russ.)

2. Rybin V.V., Konstantinov K.N., Kagan M.M., Panasenko I.G. Methodology of integrated stability monitoring in mines. Gornyi Zhurnal. 2020;(1):53–57. (In Russ.) https://doi.org/10.17580/gzh.2020.01.10

3. Pavlovich A.A. Features of geomechanical substantiation of stability of sides of quarries and slopes of dumps taking into account FNP No. 439. Mine Surveying Bulletin. 2022;(2):7–14. (In Russ.)

4. Ushakov D.K. Analysis of the factors influencing the sustainability of rock sciences in the sides of the career. Transbaikal State University Journal. 2019;25(1):29–36. (In Russ.) https://doi.org/10.21209/2227-9245-2019-25-1-29-36

5. Morgenstern N.R., Price V.E. The analysis of the stability of general slip surfaces. Géotechnique. 1965;15(1):79–93. https://doi.org/10.1680/geot.1965.15.1.79

6. Morgenstern N.R., Price V.E. A numerical method for solving the equations of stability of general slip surfaces. Computer Journal. 1967;9(4):388–393. https://doi.org/10.1093/comjnl/9.4.388

7. Yang S., Su L., Zhang C., Li C., Hu B. Analysis of seepage characteristics and stability of Xigeda Formation slope under heavy rainfall. Tumu yu Huanjing Gongcheng Xuebao / Journal of Civil and Environmental Engineering. 2020;42(4):19–27. (In Chinese).

8. Kumar V., Himanshu N., Burman A. Rock Slope Analysis with Nonlinear Hoek–Brown Criterion Incorporating Equivalent Mohr–Coulomb Parameters. Geotechnical and Geological Engineering. 2019;37(6):4741–4757. https://doi.org/10.1007/s10706-019-00935-9

9. Mhaske S., Kapoor I., Pathak K., Kayet N. Slope Stability Analysis of the Overburden Dump of Meghahatuburu Iron Ore Mines in Singhbhum Region of India. In: Lin J. (eds) Proceedings of the International Field Exploration and Development Conference 2019. IFEDC 2019. Singapore: Springer Series in Geomechanics and Geoengineering; 2020, pp. 3591–3605. https://doi.org/10.1007/978-981-15-2485-1_328

10. Read J., Stacey P. (eds) Guidelines for Open Pit Slope Design. Australia; 2009. https://doi.org/10.1071/9780643101104

11. Bushira K.M., Gebregiorgis Y.B., Verma R.K., Sheng Z. Cut soil slope stability analysis along National Highway at Wozeka–Gidole Road. Ethiopia Modeling Earth Systems and Environment. 2018;4(2):591–600. https://doi.org/10.1007/s40808-018-0465-6

12. Yarg L.A., Fomenko I.K., Zhitinskaya O.M. Evaluation of slope optimization factors for long-term operating open pit mines (in terms of the Stoilensky iron ore deposit of the Kursk Magnetic Anomaly). Gornyi Zhurnal. 2018;(11):76–81. (In Russ.) https://doi.org/10.17580/gzh.2018.11.14

13. Fomenko I.K., Gorobtsov D.N., Novgorodova M.A., Sirotkina O.N. State of the art tools for assessing the stability of open pit walls and dump slopes. In: Zyryanov I.V., Bondarenko I.F. (eds) Mining Industry in the 20th Century: Challenges and reality: collection of abstracts of the International Scientific and Practical Conference, Mirnyi, September 15–16, 2021 г. Mirnyi: ALROSA; 2021, pp. 29–32. (In Russ.)

14. Makarov A.B., Livinskiy I.S., Spirin V.Ig., Pavlovich A.A. PIT slope stability management as a basis for responding global challenges. Izvestiya Tulskogo gosudarstvennogo universiteta. Nauki o zemle. 2021;(3):188–202. (In Russ.) https://doi.org/10.46689/2218-5194-2021-3-1-182-196