SpetsStroyEkspert, Moscow, Russia:

T. N. Dymbrenov, CEO, Candidate of Engineering Sciences

NUST MISIS College of Mining, Moscow, Russia:

V. A. Eremenko, Director of the Research Center for Applied Geomechanics and Convergent Technologies in Mining, Professor of the Russian Academy of Sciences, Doctor of Engineering Sciences

SpetsStroyEkspert, Moscow, Russia¹ ; NUST MISIS College of Mining, Moscow, Russia²:

V. I. Leizer^1,2, Chief Engineer, Post-Graduate Student, lvi@sste.ru
R. R. Nasibullin^1,2, Engineer, Post-Graduate Student

The Iletsk rock salt field development for 200 years has been carried out is a disordered manner. Alongside open pits, a few underground mines were operated (Elizavetinskaya, Mariinskaya) but not for long and were flooded soon. The flooding of those mines and Mine No. 1 later on was explained by their occurrence inside the top jointed and karstic salt core. Mining safety and efficiency under conditions of flooded Mine 1, as well as actual mining operations on the second and third levels of Mine 2 is ensured by means of handling some geomechanical problems. In the course of the stress–strain assessment in a rib pillar of large cross-section and extension, it was recorded that the load on the rock bolting system in the pillar grew but the deformation studies in the pillar edges showed no straining. The obtained results make it possible to draw a conclusion that the existing rock bolting system performs the duty: it distributes load between rock bolts and holds small pieces of rock salt between the rock bolts in case of inrush. The former function is especially critical for the reliable operation of the whole support system in the conditions of plasticity. The average increment in the load applied to the rock bolting system is estimated as 120 kg per month, or 1.5 ton per year. The integrated geotechnical monitoring system allows recording and display of deformation and incremental loading of support in pillars. The linear patterns of the obtained data make it possible to predict the load increase and to adjust the mining process flows if necessary.

1. Guidelines for safe development of the Iletsk rock salt field. Perm : JSC Galurgiya, 2013. 119 p.
2. The Iletsk rock salt field development stage I : Detailed design. Orenburg : Russol LLC, 2013.
3. Detailed design of the Iletsk rock salt field development. Saint-Petersburg : SPb-Giproshakht, 2018.
4. Cheskidov V. V., Lipina A. V., Melnichenko I. A. Integrated monitoring of engineering structures in mining. Eurasian Mining. 2018. No. 2. pp. 18–21. DOI: 10.17580/em.2018.02.05
5. Contreras L.-F., Brown E. T. Slope reliability and back analysis of failure with geotechnical parameters estimated using Bayesian inference. Journal of Rock Mechanics and Geotechnical Engineering. 2019. Vol. 11, Iss. 3. pp. 628–643.
6. Masoud S. S., Parviz M., Ebrahim Y. Optimizing and slope determination of final wall for Maiduk Mine with consideration of destabilizer factors. International Journal of Mining Science and Technology. 2016. Vol. 26, Iss. 3. pp. 501–509.
7. Batali L., Andreea C. Slope Stability Analysis Using the Unsaturated Stress Analysis. Case Study. Procedia Engineering. 2016. Vol. 143. pp. 284–291.
8. Zakharov V. N., Eremenko V. A., Fedorov E. V., Lagutin D. V. Geomechanical support of mine planning and design in the Iletsk rock salt field. Gornyi Zhurnal. 2018. No. 2. pp. 41–47. DOI: 10.17580/gzh.2018.02.06
9. Mine flooding protection and countermeasures to detrimental influence of mining on ground surface. Perm, 2007.
10. Eremenko V. A., Esina E. N. Design procedure for stopes and pillars using rock mass quality criteria. Integrated Subsoil Preservation and Management : Problems and Prospects. Academician Trubetskoy School II Conference Proceedings. Moscow : IPKON RAN, 2016. pp. 177–181.
11. Kurlenya M. V., Seryakov V. M., Eremenko A. A. Mining-induced stress fields. Novosibirsk : Nauka, 2005. 264 p.
12. Borshch-Komponiets V. I., Makarov A. B. Rock pressure during thick flat ore deposit stoping. Moscow : Nedra, 1986. 271 p.
13. Makarov A. B. Practical geomechanics. Moscow : Gornaya kniga, 2006. 391 p.
14. Barton N., Lien R., Lunde J. Engineering classification of rock masses for the design of tunnel support. Rock Mechanics. 1974. Vol. 6(4). pp. 183–236.
15. Barton N. Application of Q-system and index tests to estimate shear strength and deformability of rock masses. Workshop on Norwegian Method of Tunneling. New Delhi, 1993. pp. 66–84.
16. Lushnikov V. N., Sandy M. P., Eremenko V. A., Kovalenko A. A., Ivanov I. A. Method of definition of the zone of rock massif failure range around mine workings and chambers by numerical modeling. Gornyi Zhurnal. 2013. No. 12. pp. 11–16.
17. Overview. Map3D, 2021. Available at: https://www.map3d.com/overview (accessed: 15.06.2021).
18. Dymbrenov T. N., Nasibullin R. R., Bushtak N. V., Leizer V. I. Automated geotechnical monitoring in construction of running tunnels in subways under operating railroads. Gornyi Zhurnal. 2021. No. 5. pp. 53–57. DOI: 10.17580/gzh.2021.05.04