Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
V. N. Karpov, Senior Researcher, Candidate of Engineering Sciences
V. N. Koltyshev, Researcher, Witalq@mail.ru

Alzamir Science and Production Association, Kemerovo, Russia
A. V. Aikin, Deputy CEO—Technical CEO

Optical systems to study structure, lithology and mineralogy are widely used in borehole investigations in mining and are being persistently improved. One of the critical areas of optical inspection is the determination of jointing parameters in rock quality assessment for rock bolting, in geological engineering and zoning of mineral deposits, in examination of enclosing rocks surrounding blasting blocks, in evaluation of drilling efficiency, in the stress–strain analysis of rocks and in their stability estimation. Preparatory and production blasts in different areas of a mine field induces stress re-distribution in rocks, with after-effects in the form of damages or total failure, which show up in destressing boreholes. Visual observations were carried out in the destressing boreholes in the Tashtagol Mine. Damages were recorded in the form of longitudinal and transverse cracks, faults and rock falls at different depths and at different measurement points on the Level of –270 m. The jointing zones from low jointing to extreme jointing were revealed in the test rock mass. Based on the nature of damages in boreholes and from the analysis of geomechanical situation during mining, it is found that destressing of rock mass took place in the zones of heavily to extremely jointed areas. In the identified zones, contraction of boreholes with formation of an ellipse-shaped cross-section, rock falls, exfoliation, fracturing and failure with total loss of boreholes were observed.
The study was carried out within Project No. 121051900145-1.

1. Anufriev V. E., Deniskin N. F., Fedorinin V. N., Pozolotin A. S., Kharitonov V. G. Endoscopic survey of disintegration in adjacent rock mass of underground roadways. MIAB. 2003. No. 2. pp. 183–186.
2. Kazanin O. I., Ilinets A. A. Roadways stability monitoring in mines of JSC SUEK-Kuzbass using video endoscopes. Vestnik Kuzbasskogo gosudarstvennogo tekhnicheskogo universiteta. 2020. No. 2(138). pp. 12–17.
3. QL40 OBI-2G Optical borehole imager. Mount Sopris Instruments, 2023. 2 p.
4. Eremenko V. A., Vinnikov V. A., Kosyreva M. A., Lagutin D. V. Identification of rock jointing parameters by borehole imaging and interval geotechnical documentation of non-oriented drill cores. Gornyi Zhurnal. 2022. No. 1. pp. 21–26.
5. Eremenko V. A., Ainbinder I. I., Marysyuk V. P., Nagovitsyn Yu. N. Guidelines for selecting ground support system for the Talnakh operations based on the rock mass quality assessment. Gornyi Zhurnal. 2018. No. 10. pp. 101–106.
6. Zayatdinov D. F., Pozolotin A. S., Mefodiev S. N. Substantiation of technology and support design for roadways sustained for recycling in thin seams in bottom-up longwall mining. Gornyi Zhurnal. 2021. No. 1. pp. 44–53.
7. Nemova N. A., Reznik A. V., Karpov V. N. Modeling of geomechanical processes in the fields in the conditions of digital transformation of mining enterprises. Interekspo Geo-Sibir. 2021. Vol. 2, No. 3. pp. 332–341.
8. Oparin V. N., Karpov V. N., Timonin V. V., Konurin A. I. Evaluation of the energy efficiency of rotary percussive drilling using dimensionless energy index. Journal of Rock Mechanics and Geotechnical Engineering. 2022. Vol. 14, Iss. 5. pp. 1486–1500.
9. Eremenko V. A., Aynbinder I. I., Patskevich P. G., Babkin E. A. Assessment of the state of rocks in underground mines at the Polar Division of Norilsk Nickel. MIAB. 2017. No. 1. pp. 5–17.
10. Eremenko A. A., Koltyshev V. N., Uzun E. E., Khristolyubov E. A. Rock mass structure assessment on the destress borehole surface in rock pillar in Sheregesh Mine. MIAB. 2023. No. 11. pp. 91–101.
11. Trofimov A. V., Rumyantsev A. E., Gospodarikov A. P., Kirkin A. P. Non-destructive ultrasonic method of testing the strength of backfill concrete at deep Talnakh mines. Tsvetnye Metally. 2020. No. 12. pp. 28–33.
12. Nesterov K. V., Kuzenkov M. V. Expanding Kola MMC’S resource base. Tsvetnye Metally. 2019. No. 11. pp. 16–21.
13. Trofimov A. V., Kirkin A. P., Rumyantsev A. E., Yavarov A. V. Use of numerical modelling to determine optimum overcoring parameters in rock stress-strain state analysis. Tsvetnye Metally. 2020. No. 12. pp. 22–27.
14. Obryadin A. A. Influence of destressing boreholes on the stress–strain behavior of rock mass. Science and the Youth : Problems, Search and Solutions. Procedings of All-Russian Conference of Students, Post-Graduates and Young Scientists. Novosibirsk : Izdatelskiy tsentr SibGIU, 2017. Vol. 21, Iss. II. pp. 87–90.
15. Sleptsov S. N., Eremenko A. A., Leftor V. V., Prib V. V. Development of the methods for discharging a rock mass during second working at a rockburst hazardous iron ore deposit. Bezopasnost Truda v Promyshlennosti. 2021. No. 12. pp. 7–12.
16. Sergunin M. P., Darbinyan T. P., Mushtekenov T. S., Balandin V. V. Assessment of destressing drilling efficiency using numerical methods: A case-study of Oktyabrsky deposit. Gornyi Zhurnal. 2021. No. 2. pp. 26–31.
17. Ivanov V. I., Belov N. I. Prevention of rock bursts hazard with relief holes. Predicition and Prevention of Rock Bursts in Ore Bodies : Collected Papers. Apatity, 1993. pp. 83–87.
18. Gorpinchenko V. A., Saznov V. V., Andreev A. A., Vilchinskiy V. B. Procedure for determining efficient parameters of relief holes for safe destressing of rockbursthazardous rock masses in the Norilsk Industrial Area. Gornyi Zhurnal. 2015. No. 6. pp. 68–73.
19. Kan J., Dou L., Li J., Li X., Bai J. et al. Characteristics of microseismic waveforms induced by underground destress blasting: comparison with those induced by ground blasting and coal mining. Frontiers in Earth Science. 2022. Vol. 10. ID 797358.
20. Cheng P., Li Y., Lu C., Jiang S., Xu H. Study on blasting effect optimization to promote sustainable mining under frozen conditions. Sustainability. 2022. Vol. 14, Iss. 24. ID 16479.
21. Daou I. E., Harouna S., Hassan A. M., Boukari H., Oauba H. C. Monitoring of blasting operations techniques and assessment of their impacts on groundwater in the context of underground mining: Case of ROXGOLD SANU, Burkina Faso. International Journal of Environment and Climate Change. 2022. Vol. 12, Iss. 12. pp. 491–505.
22. Zhao J.-S., Chen B.-R., Jiang Q., Lu Frank J.-F., Hao X.-J. et al. Microseismic monitoring of rock mass fracture response to blasting excavation of large underground caverns under high geostress. Rock Mechanics and Rock Engineering. 2022. Vol. 55, Iss. 2. pp. 733–750.
23. Watson D. Nngridr: An Implementation of Natural Neighbor Interpolation. Claremont, 1994. 170 p.
24. Galchenko Yu. P., Eremenko V. A., Vysotin N. G., Kosyreva M. A. Justification of functional organization and contents of modeling cluster concept for geomechanical research of convergent mining technologies. Eurasian Mining. 2021. No. 2. pp. 11–17.
25. Eremenko A. A., Koltyshev V. N., Uzun E. E., Khristolyubov E. A. Rock mass structure assessment on the destress borehole surface in rock pillar in Sheregesh Mine. MIAB. 2023. No. 11. pp. 91–101.
26. Tyupin V. N. Estimation of critical depth of deposits by rock bump hazard condition. Journal of Mining Institute. 2019. Vol. 236. pp. 167–171.
27. Neverov S. A., Shaposhnik Yu. N., Neverov A. A., Konurin A. I. Integration of Russian and foreign rock mass stability classifications for validation of mine support systems. Gornyi Zhurnal. 2022. No. 1. pp. 56–61.