Journals →  Gornyi Zhurnal →  2021 →  #8 →  Back

PHYSICS OF ROCKS AND PROCESSES
ArticleName Influence of stoping on formation of damaged rock zones at boundaries of large cross-section excavations in apatite–nepheline mining
DOI 10.17580/gzh.2021.08.04
ArticleAuthor Sinegubov V. Yu., Popov M. G., Vilner M. A., Sotnikov R. O.
ArticleAuthorData

Saint-Petersburg Mining University, Saint-Petersburg, Russia:

V. Yu. Sinegubov, Associate Professor, Candidate of Engineering Sciences
M. G. Popov, Associate Professor, Candidate of Engineering Sciences
M. A. Vilner, Post-Graduate Student, mary.vilner@gmail.com
R. O. Sotnikov, Post-Graduate Student

Abstract

Introduction of new equipment in the production cycle in mines can greatly accelerate the pace of construction and can increase production output. And yet considerable time is spent on preparatory works, transport operations and shunting. To reduce the time consumption, engineers make nonroutine decisions on the arrangement of process equipment in underground excavations, which imposes certain requirements on their geometry and support design. For example, the design size of grinding chambers can exceed 14 m in height and 8 m in width. These dimensions are almost 2 times higher than the size stated in the regulatory documents. The mine support design guidelines are unadapted to the dimensions of such underground openings, and disregard the construction sequence, complicated geological and mining conditions, and the influence of stoping. As a result, geomechanical processes in the vicinity of large cross-section excavations in fractured rock masses can only be estimated approximately. This paper proposes a mathematical modeling algorithm including rock mass fracture intensity, the length/width ratio of a large cross-section excavation and the presence of junctions with other excavations. Such stress–strain analysis of tock mass provides the pattern of geomechanical behavior in the vicinity of the underground excavation, namely, it allows determining the change patterns of damaged zones in rock mass. It is shown that stoping can lead to an increase in the size of the limit state zones up to 3 times, which exceeds the safety factor as per the regulatory documents. The obtained results can widen the field of application of regulatory documents in mining.

keywords Geomechanics, large cross-section excavations, mine support, numerical modeling, structural discontinuities, limit state zone, stress–strain behavior, stability
References

1. Gospodarikov A. P., Zatsepin M. A. Mathematical modelling of applied problems of rock mechanics and rock massifs. Journal of Mining Institute. 2014. Vol. 207. pp. 217–221.
2. Kozyrev A. A., Savchenko S. N., Panin V. I., Semenova I. E., Rybin V. V. et al. Geomechanical processes in the geological environment of geotechnical systems and geodynamic risk management. Apatity : KNTs RAN, 2019. 431 p.
3. Kononenko M., Khomenko O., Sudakov A., Drobot S., Lkhagva Ts. Nume rical modelling of massif zonal structuring around underground working. Mining of Mineral Deposits. 2016. Vol. 10, Iss. 3. pp. 101–106.
4. Sinegubov V. Predicting the Stress-Strain State of a Massif at The Stage of Creating A Protective Cover in The Conditions of Developing Iron Ore Deposits Under Water-Bearing Strata. International Journal of Recent Technology and Engineering. 2019. Vol. 8, Iss. 1. pp. 133–138.
5. Korsakov O. P., Kolka V. V., Savchenko S. N. Block structures of the Kola Peninsula, their resistance under the conditions of natural and technical systems (by the example of the Khibiny and Lovozero mountains). Vestnik MGTU. Trudy Murmanskogo gosudarstvennogo tekhnicheskogo universiteta. 2009. Vol. 12, No. 3. pp. 478–491.
6. Kuvaeva N. M., Barun E. S., Bogadayko O. P. et al. Additional exploration of the Rasvumchorr Plateau between cross-sections 0–12V down to Level +100 m (with reserves appraisal as of 1 January 2012 : Geological report. Apatity, 2011.
7. Protosenya A. G., Karasev M. A., Belyakov N. A. Elastoplastic problem for noncircular openings under Coulomb’s criterion. Journal of Mining Science. 2016. Vol. 52, Iss. 1. pp. 53–61.
8. Balandin V. V., Leonov V. L., Kuranov A. D., Bagautdinov I. I. Application of generalized Hoek–Brown criterion to selection and design of mine support systems for the Oktyabrsky copper–nickel deposit: Case study. Gornyi Zhurnal. 2019. No. 11. pp. 14–18. DOI: 10.17580/gzh.2019.11.01
9. Palmstrom A. Measurements of and correlations betwe en block size androck qu ali ty designation (RQD). Tunnelling and Underground Space Technology. 2005. Vol. 20, Iss. 4. pp. 362–377.
10. Hoek E., Carter T. G., Diederichs M. S. Quantification of the Geological Strength Index Chart. 47th U.S. Rock Mechanics/Geomechanics Symposium. San Francisco, 2013.
11. Priest S. D., Hudson J. A. Discontinuity Spacings in Rock. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts. 1976. Vol. 13, Iss. 5. pp. 135–148.
12. Bieniawski Z. T. Engineering Rock Mass Classifications: A Complete Manual for En gineers and Geologists in Mining Civil and Petroleum Engineering. New York : John Wiley and Sons, Inc., 1989. 251 p.
13. Bieniawski Z. T. Rock mass classification in rock engineering. Proceedings of the Symposium on Exploration for Rock Engineering. Cape Town : Balkema, 1976. pp. 97–106.
14. Gospodarikov A. P., Zatsepin M. A. Mathematical modeling of boundary problems in geomechanics. Gornyi Zhurnal. 2019. No. 12. pp. 16–20. DOI: 10.17580/gzh.2019.12.03
15. Protosenya A. G., Karasev M. A. Models of strength and fracture of rocks. Geomechanics and Geodynamics of Rock Masses : Proceedings of the 2018 European Rock Mechanics Symposium. London : Taylor & Francis Group, 2018. Vol. 2. pp. 733–739.
16. Bo Yan, Xinwu Zeng, Yuan Li. Subsection Forward Modeling Method of Blasting Stress Wave Underground. Mathematical Problems in Engineering. 2015. Vol. 2015. ID 678468. DOI: 10.1155/2015/678468
17. Ömer Aydan. Rock Dynamics. ISRM Book Series. Leiden : CRC Press/Balkema, 2017. 474 p.
18. Sotnikov R. O., Vilner M. A. Forecast of the influence of dynamic rock pressure manifestations on the stability of openings. GIAB. 2020. No. 6, Special issue 21. pp. 3–12.
19. Menéndez J., Schmidt F., Konietzky H.,Fernández-Oro J. M., Galdo M. et al. Stability analysis of the underground infrastructure for pumped storage hydropower plants in closed coal mines. Tunneling and Underground Space Technology. 2019. Vol. 94. 103117. DOI: 10.1016/j.tust.2019.103117
20. Cai M., Kaiser P. K. Rockburst Support : Reference Book. Sudbury : Laurentian University, 2018. Vol. 1. Rockburst Phenomenon and Support Characteristics. 284 p.
21. Lushnikov V. N., Eremenko V. A., Sendi M. P., Kosyreva M. A. Support design for mines exposed to rockburst hazard. Journal of Mining Science. 2017. Vol. 53, No. 3. pp. 504–512.

Language of full-text russian
Full content Buy
Back