Журналы →  Gornyi Zhurnal →  2022 →  №4 →  Назад

Название Adjacent rock mass damage in influence zones of stopes with rock bolt support and shotcrete lining
DOI 10.17580/gzh.2022.04.10
Автор Sinegubov V. Yu.
Информация об авторе

Geotechnical Bureau LLC, Saint-Petersburg, Russia:

V. Yu. Sinegubov, Associate Professor, Candidate of Engineering Sciences, vs.geotechburo@gmail.com


Heading and stoping in mines change the stress–strain behavior of adjacent rock mass, which can lead to adverse consequences, including the limiting state of rocks and formation of damaged zones. The damaged zones appear not instantly but are associated with mining operations. The parameters of the damaged rock zones depend on geotechnical conditions of stoping, on mechanical properties of rocks and on the stoping impact. Natural structural discontinuities in rock mass even more complicate calculations. Traditionally, the size of the damaged zones is controlled via mine support installation. However, in hard rocks, efficiency of mine support systems is not so high. This article presents an analytical solution on the support design and conditions to ensure that no damaged zones arise in adjacent rock mass. The analysis of the physical, mechanical and structural properties of rock mass, typical of mines of Apatit’s Kirovsk Branch of allowed reliable numerical modeling and comparison of sizes of damaged rock zones in various stopes without support and with rock bolting and shotcrete lining. The damaged zone pattern in adjacent rock mass around an arched stope is analyzed as a case-study of mines of Apatit’s Kirovsk Branch, and the effect of the rock bolt support and shotcrete lining on the size of this zone is determined. The calculations show that in the discussed geological conditions, the use of mine support reduces the size of the damaged zone by 7–20 %, which helps optimize the support design and expands its application field but fails to totally eliminate damaged zone formation. The mechanical properties and structural discontinuities in rock mass have a serious effect and should be in spotlight of the analysis.

Ключевые слова Rock bolt support, shotcrete lining, stoping, damaged rock zone, stope, numerical modeling, discontinuous rock mass
Библиографический список

1. Verbilo P. E. Model of the stre ss-strain state prediction of a building during the construction of a tunnel under it. Geomechanics and Geodynamics of Rock Masses : Proceedings of the 2018 European Rock Mechanics Symposium. London : CRC Press, 2018. Vol. 2. pp. 1959–1965.
2. Shabarov A. N., Tsirel S. V. Geodynamic safety in underground mining. Gornyi Zhurnal. 2017. No. 9. pp. 65–70. DOI: 10.17580/gzh.2017.09.12
3. Shabarov A., Kuranov A., Popov A., Tsirel S. Geodynamic risks of mining in highly stressed rock mass. Problems in Geomechanics of Highly Compressed Rock and Rock : Proceedings of the 1st International Scientific Conference. 2019. E3S Web of Conferences. 2019. Vol. 129. 01011. DOI: 10.1051/e3sconf/201912901011
4. Petrov D. N., Kuranov A. D. Formation of inelastic deformation around entries covered metal ores Yakovlevski mine. Izvestiya Tulskogo gosudarstvennogo universiteta. Nauki o Zemle. 2011. No. 1. pp. 352–356.
5. Sine gubov V. Yu., Popov M. G., Vilner M. A., Sotnikov R. O. Influence of stoping on formation of damaged rock zones at boundaries of large cross-section excavations in apatite–nepheline mining. Gornyi Zhurnal. 2021. No. 8. pp. 26–30. DOI: 10.17580/gzh.2021.08.04
6. Stavrogin A. N., Protosenya A. G. Mechanics of deformation and failur e of rocks. Moscow : Nedra, 1992. 224 p.
7. Nguyen Tai Tien, Karasev M. A., Vilner M. A. Study of the stress-strain state in the sub-rectangular tunnel. Geotechnics for Sustainable Infrastructure Development : Conference proceedings. Series: Lect ure Notes in Civil Engineering. Singapore : Springer, 2020. Vol. 62. pp. 383–388.
8. Protosenya A. G., Iovlev G. A. Prediction of spatial stress-strain behavior of physically nonlinear soil mass in tunnel face area. GIAB. 2020. No. 5. pp. 128–139.
9. Guidelines on mine support and ground control in mines of Apatit JSC. Kirovsk – Saint-Petersburg, 2016.
10. Protoseniya A. G., Bagautdinov I. I. The forecast of the stress-strained state of the jointed rock ore around mine working. Izvestiya vuzov. Gornyi zhurnal. 2015 . No. 4. pp. 45–51.
11. Kuzmin E. V., Uzbekova A. R. Rock mass rating classifications and applications. GIAB. 2005. No. 5. pp. 181–185.
12. 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
13. Procedural rules for design planning o f mi ning operations at Apatite Circus deposit and extraction of ore reserves under open pit mine bottom at Rasvumchorr Plateau deposit by Rasvumchorr Mine down to level +310 m. Saint-Petersburg, 2010. 200 p.
14. Kozyrev A. A., Semenova I. E., Rybin V. V., Panin V. I., Fedotova Yu. V., Konstantinov K. N. Guidelines for safe mining under conditions of rockburst hazard (Khibiny apatite–nepheline deposits). Apatity, 2016. 112 p.
15. Hoek E., Carranza-Torres C., Corkum B. Hoek -Brown failure criterion – 2002 Edition. Proceedings of the Fifth North American Rock Mechanics Symposium. Toronto, 2002. Vol. 1. pp. 267–273.
16. Hoek E., Diederichs M. S. Empirical estimation of rock mass modulus. International Journal of Rock Mechanics and Mining Sciences. 2006. Vol. 43, Iss. 2. pp. 203–215.
17. Sajjad Hussian, Noor Mohammad, Zahid Ur Rehman, Naseer Muhamm ad Khan, Khan Shahzada et al. Review of the Geological Strength Index (GSI) as an Empirical Classification and Rock Mass Property Estimation Tool: Origination, Modifications, Applications, and Limitations. Advances in Civil Engineering. 2020. Vol. 2020. 6471837. DOI: 10.1155/2020/6471837
18. Labass A. Overburden pressure in coal mines. Th eory of overburden pressure : Digest. Moscow : Gosgortekhizdat, 1961. pp. 59–164.
19. Louchnikov V. N., Eremenko V. A., Sandy M. P., Kosyreva M. A. Support Design for Mines Exposed to Rockburst Hazard. Journal of Mining Science. 2017. Vol. 53, Iss. 3. pp. 504–512.
20. Smirnova O. M. Technology of increase of nanoscale pores volume in protective cement matrix. International Journal of Civil Engineering and Technology. 2018. Vol. 9, Iss. 10. pp. 1991–2000.
21. I 4121-004–2017. Guidelines on mine support and ground control in min es of Apatit JSC. Kirovsk : AO Apatit, 2017.

Language of full-text русский
Полный текст статьи Получить