Rock mass stability estimation in phased mining of Zhdanov lentil reserves by stress–strain modeling data

Extraction of mineral reserves from lentils and lodes of complex geometry by the open stoping method requires optimization of room and pillar parameters and stoping sequence. Safe and complete extraction of lentils can only be ensured given stability of roof rocks in rooms and maintenance of pillar parameters. SW 2 lentil occurs at the South-West ore body of Zhdanov deposit and features a complex geometry. Dimensions of the lentil enable using the open stoping method. Determination of stability conditions for pillar and open stope in this area of Zhdanov deposit is of the current concern. To this effect, we used the 2D elastic stress–strain modeling based on the finite element method. Two models were constructed to describe the vertical cross-sections along and across the strike of the ore body. The stress–strain modeling produced distribution of maximal and minimal stresses and the stable parameters of pillar and open stope.

Kulkova M. S., Zemtsovskii A. V. Rock mass stability estimation in phased mining of Zhdanov lentil reserves by stress–strain modeling data. MIAB. Mining Inf. Anal. Bull. 2021;(5— 2):103—110. [In Russ]. DOI: 10.25018/0236_1493_2021_52_0_103.

Kulkova M. S.¹, PhD student, Junior researcher, m.kulkova@ksc.ru;
Zemtsovskii A. V.¹, Cand. Sci. (Eng.), Head of the laboratory;
¹ Mining Institute KSC RAS, Apatity, Russia.

1. Nesterov K. V., Kuzenkov M. V. Expanding Kola MMC’S resource base. Cvetnye metally. 2019. no. 11 (923). pp. 16—22. DOI 10.17580/tsm.2019.11.01. [In Russ]

2. Gorbunov G. I., Astaf’ev Yu. A., Goncharov Yu. V. i dr. Medno-nikelevye mestorozhdeniya Pechengi [Copper-nickel deposits of Pechenga]. Moscow: GEOS. 1999. 236 p. [In Russ]

3. Volkov V. N., Makeev V. I. History and prospects of development of mineral resource complex of Kola Mining and Metallurgical Company. Cvetnye metally. 2013. no. 10. pp. 27—32. [In Russ]

4. Tokarev O. V., Kuzenkov M. V., Udalov A. E. Underground mining technology for the transition from open-pit to underground operation at the Zhdanov copper–nickel ore deposit. Gornyj zhurnal. 2015. no. 6. pp. 60—64. DOI 10.17580/gzh.2015.06.12. [In Russ]

5. Eremenko V. A., Eremenko A. A., Potapov E. V., Pavlov D. A., Atanov V. V., Vremenkov S. V. The estimation of the rock mass state of the Zhdanovskoe deposit during underground mining. MIAB. Mining Inf. Anal. Bull. 2010. no. 11. pp. 271—282. [In Russ]

6. Mallı, T. Yetkin, M. Özfırat, M. Kahraman, B. Numerical analysis of underground space and pillar design in metalliferous mine. Journal of African Earth Sciences, 2017, No. 134, pp. 365—372. DOI: 10.1016/j.jafrearsci.2017.07.018.

7. Heidarzadeh, Sh. Saeidi, A., Rouleau, A. Evaluation of the effect of geometrical parameters on stope probability of failure in the open stoping method using numerical modeling. International Journal of Mining Science and Technology, 2019. No.29, pp. 399— 408. DOI: 10.1016/j.ijmst.2018.05.011.

8. Lovchikov A. V., Udalov A. E., Belyavskij Yu. G. The rock mass stress state at the high layers of the Earth’s crust according to in-situ measurements at the underground mines near the ultra-deep bore hole SG-3. Vestnik MGTU. 2007. T.10, no. 2. pp. 267—272. [In Russ]

9. Mel’nikov D. N. Stress Measurements in rock mass of the Zhdanovskoe deposit by the doorstoppermethod. Vestnik Kol’skogo nauchnogo centra RAN. 2019. no. 1 (11). pp. 57—61. [In Russ]

10. Kozyrev A. A., Semenova I. E., Zemcovskij A. V. Ob ocenke udaroopasnosti massiva gornyh porod Zhdanovskogo mestorozhdeniya [The rock burst estimation of the Zhdanovskoe deposit rock mass]. Trudy Fersmanovskoj nauchnoj sessii GI KNC RAN. 2017. no. 14. pp. 300—303. [In Russ]

11. Heidarzadeh, Sh. Assessing the effect of open stope geometry on rock mass brittle damage using a response surface methodology. International Journal of Rock Mechanics and Mining Sciences, 2018, no.106, pp. 60—73. DOI: 10.1016/j.ijrmms.2018.03.015.

12. Wael R. Abdellah, Haitham M. Ahmed & Mohammed A. Hefni. Numerical modelling of staged stope extraction in a tabular steeply dipping deposit. Geomechanics and Geoengineering, 2019, no. 14, pp. 41—51. DOI: 10.1080/17486025.2018.1508856.