Yakutniproalmaz Institute, ALROSA, Mirny, Russia:

I. B. Bokiy, Head of Laboratory, Candidate of Physico-Mathematical Sciences, bokiyb@alrosa.ru

V. V. Pul, Advanced Manufacturing Engineer

Institute of Mining, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia:

O. V. Zoteev, Chief Researcher, Professor, Doctor of Engineering Sciences

ALROSA, Mirny, Russia:
A. S. Fedyanin, Chief Geomechanic, Candidate of Engineering Sciences

The geological structure of the Aikhal kimberlite pipe developed by ALROSA is characterized. The Aikhal deposit was discovered in 1960. Mining with open pit method was started in 1961 and finished by the end of 1997. The mined-out pit had the actual elevation of +235 m in the south west and +194.5 m in the north east (the surface elevation was +500 m). The mined-out Aikhal pit has the west-eastward extension in plan view, with the actual elevations of the bottom at +235 m in the south west, +230 – +205 m in the center and +195 m in the north east. The most of the strain–strain modeling data are interpreted in terms of composite stresses and strains, which allow judging on failure conditions. As a rule, these data poorly agree with classical calculation and in-situ observation results. This article proposes the solution to this problem and hypothesizes that prediction of displacements requires interpretation of additional strains (strains at unloading) governed by mineral mining processes and represented by opening of existing fractures, which results in weakening and failure of rock mass. The boundaries of hazardous deformation zones can be estimated based on the isolines of additional strains. The composite strains characterize alterations in enclosing rock mass, i.e. the change in the rock mass shape and volume, as well as the capability of new fractures to form.

1. Temporal guidance on conservation of constructions and natural objects from harmful impact of underground mining of non-ferrous metals deposits with unstudied process of rock movement. Leningrad : VNIMI, 1986. 76 p.
2. Guidance on conservation of constructions and natural objects from harmful impact of underground mining during copper-ore deposits mining in the Urals. Moscow : Ministerstvo tsvetnoy metallurgii SSSR, 1978. 42 p.
3. Kotenkov A. V. Experience of kimberlite mining by diamondshaped stopes in the Aikhal mine. Gornyi Zhurnal. 2019. No. 9. pp. 9–14. DOI: 10.17580/gzh.2019.09.02
4. Kolganov V. F., Akimov A. N., Drozdov A. V. Mining and Geological Features of Primary Diamond Deposits in Yakutia. Mirny : Mirninskaya tipografiya, 2013. 568 p.

5. Nikolaev A. S. Statistical analysis comparing the results of the geomechanical calculations and geological data. Gornyi Zhurnal. 2016. No. 4. pp. 15–20. DOI: 10.17580/gzh.2016.04.03
6. Zienkiewicz O. C., Taylor R. L., Zhu J. Z. The Finite Element Method: Its Basis and Fundamentals. 7th еd. Kidlington : Butterworth-Heinemann, 2013. 756 p.
7. Sergeev S. V., Zaitsev D. A. Control procedure for backfill stresses and strains as a geomechanical assessment tool in loose ore mining with slicing method. Gornyi Zhurnal. 2015. No. 8. pp. 33–36. DOI: 10.17580/gzh.2015.08.08
8. Manojit Samanta, Riya Bhowmik. 3D numerical analysis of piled raft foundation in stone column improved soft soil. International Journal of Geotechnical Engineering. 2019. Vol. 13, Iss. 5. pp. 474–483.
9. Shadrin A. G. Theory and Calculation of Rock Mass and Ground Surface Movements. Krasnoyarks : Izdatelstvo KGU, 1990. 200 p.
10. Instructional Guidelines on Determination of Hazardous one Parameters in Mines of ALROSA. Moscow, 2006.
11. Prochukhan D. P. Residual stresses in hard rock mass and the related strains at unloading. Formation and Variation of Physical and Mechanical Properties of Rocks under Natural and Induced Impacts (Geology, Engineering Construction and Rocks) : Head-Notes of Papers at II Regional Conference on Engineering Geology. Leningrad, 1966. pp. 41–59.
12. Lykoshin A. G. Fractures in lateral pressure loading. Byulleten Moskovskogo obshchestva ispytateley prirody. Otdel geologicheskiy. 1953. Vol. 28, No. 4. pp. 53–60.
13. Tokmantsev M. S. Methods of ore quality conservation during cut-and-fill mining. Problems of Subsurface Development in the 21^st Century in the Eyes of the Young : Proceedings of the 10^th International School of Young Scientists and Specialists. Moscow, 2013. pp. 115–118.
14. Xiao Y. X., Feng X. T., Li S. J., Feng G. L., Yu Y. Rock mass fail ure mechanisms during the evolution process of rockbursts in tunnels. International Journal of Rock Mechanics and Mining Sciences. 2016. Vol. 83. pp. 174–181.
15. Poulsen B. A., Adhikary D. P., Elmouttie M. K., Wilkins A. Convergence of synthetic rock mass modelling and the Hoek–Brown strength criterion. International Journal of Rock Mechanics and Mining Sciences. 2015. Vol. 80. pp. 171–180.
16. Villaescusa Е. Geotechnical Design for Sublevel Open Stoping. Boca Raton : CRC Press, 2014. 542 p.
17. Makarov A. B., Rasskazov I. Yu., Saksin B. G., Livinsky I. S., Potapchuk M. I. Geomechanical evaluation of roof-and-pillar parameters in transition to underground mining. Journal of Mining Science. 2016. Vol. 52, Iss. 3. pp. 438–447.
18. Ruchkin V. I., Zheltysheva O. D. The effect of technogenic load on the dynamics of stress-strain state of rock mass. Problemy nedropolzovaniya. 2015. No. 1. pp. 26–31.
19. Sashurin A. D., Panzhin A. A. The Mechanism of the Formation of the Emergency Situations with the Various Scales due to the Modern Geodynamic Movements. Chernaya metallurgiya. 2017. No. 1. pp. 21–24.
20. Shupletsov Yu. P. Durability and deformability of rock massifs. Ekaterinburg : Izdatelstvo UrO RAN, 2003. 194 p.
21. Rafet Zeqiri, Jahir Gashi, Festim Kutllovci. Stability analysis of security pillars with dimension 10×10 m fromed by ore of mineral body during the exploitation of the Trepça mine in Stantërg. Mining Science. 2019. Vol. 26. pp. 37–44.
22. Chęciński S., Witt A. Modeling and simulation analysis of mine production in 3D environment. Mining Science. 2015. Vol. 22. pp. 183–191.