Galurgiya, Perm, Russia:

D. N. Alymenko, Director of Science, Candidate of Engineering Sciences, mail@gallurgy.ru
V. A. Soloviev, Chief Researcher, Professor, Doctor of Engineering Sciences
V. N. Aptukov, Chief Researcher, Professor, Doctor of Engineering Sciences

Uralkali, Berezniki, Russia:
E. K. Kotlyar, Technical Director

Conventional support type for mine openings near mine shafts in salt rocks is concrete lining. Long-term instrumental monitoring of lining in underground excavations and adjacent rock mass in mines of the Upper Kama potash salt deposit and in the diamond mines of Mirny Mining and Processing Plant show that concrtete fails in 10–20 years of operation. Support damage at intersections in mines leads to halt of mine shafts for basic repair, with removal of concrete lining. Adjacent salt rock mass keeps stability after removal of damaged concrete lining, and mine openings repaired and reinforced by lightweight yielding support operate successfully for a long time (30–40 years). At the same time, there is a contradiction. According to the Construction Norms and Regulations, the intersections of mine shafts with horizontal openings and stopes should be reinforced with rigid support for a length of 30–50 m, and later on, after 10–20 years of operation, the concrete lining can be removed and replaced by the yielding support. The authors have evaluated expediency of lightweigth support types—rock bolting and/or yielding frames—at junctures in mines. The conclusions are based on the results of long-term instrumental monitoring of adjacent rock mass and mathematical modeling of rock mass stress state in ANSYS.

1. Öge İ. F. Determination of deform ation modulus in a weak rock mass by using Menard pressuremeter. International Journal o f Rock Mechanics and Mining Sciences. 2018. Vol. 112. pp. 238–252.
2. Solovyev V. A., Aptukov V. N., Konstantinova S. A., Sekuntsov A. I. Stability of junctions of shafts and mine roadways in saliniferous rock masses. Gornyi Zhurnal. 2013. No. 7. pp. 53–56.
3. Elnabolsy K. Shaft Construction Methods Comparison. 2015. Available at: https://ru.scribd.com/document/321024640/Shaft-Construction-Methods-Comparison (accessed: 26.02.2019).
4. Kamnev E. N., Morozov V. N., Tatarinov V. N., Kaftan V. I. Geodynamic aspects of investigations in underground research laboratory (Nizhnekansk Massif). Eurasian Mining. 2018. No. 2. pp. 11–14. DOI: 10.17580/em.2018.02.03
5. Polyakov A. L., Misnikov V. A., Lutovich E. A., Erokhin K. A. Maintaining of Starobin potash deposit workings using special types of the support. Part 1. Requirements for maintaining of the workings using increased bearing capacity anchors. Gornaya mekhanika i mashinostroenie. 2017. No. 3. pp. 37–45.
6. Judeel G., Keyter G. J., Harte N. D. Shaft Lining Design for a Potash Shaft in Rock Salts at Depth. Proceedings of the 3rd International Conference on Shaft Design and Construction. London, 2012. pp. 51–54.
7. Renani H. R., Martin C. D., Hudson R. Back Analysis of Rock Mass Displacements Around a Deep Shaft Using Two- and Three-Dimensional Continuum Modeling. Rock Mechanics and Rock Engineering. 2016. Vol. 49, Iss. 4. pp. 1313–1327.
8. Soloviev V. A., Aptukov V. N., Kotlyar E. K. Geomechanical and technological aspects of shaft design improvement in salt rocks. Gornyi Zhurnal. 2015. No. 11. pp. 24–28. DOI: 10.17580/gzh.2015.11.05
9. Bulychev N. S., Abramson Kh. I. Vertical mine shaft support. Moscow : Nedra, 1978. 301 p.
10. SP 91.13330.2012. Underground mine workings. Moscow : Minregion Rossii. 2012. 58 p.
11. Wang L., Bérest P., Brouard B. Mechanical Behavior of Salt Caverns: Closed-Form Solutions vs Numerical Computations. Rock Mechanics and Rock Engineering. 2015. Vol. 48, Iss. 6. pp. 2369–2382.
12. Protosenia A. G., Nguen N. B. The forecast of stress state of massif at the area of mine shaft and gallery junction. Izvestiya vuzov. Gornyi zhurnal. 2015. No. 7. pp. 50–55.
13. Tarasov V. V., Chaginov A. V. Ensuring the sustainability of support in pairing of a vertical shaft with horizontal mine workings in complex geological conditions of the Upper Kama deposit. GIAB. 2014. No. 4. pp. 81–85.
14. Aptukov V. N. Deformation criterion of salt rock failure. Journal of Mining Science. 2016. Vol. 52, Iss 3. pp. 448–453.
15. GOST R 52042–2003. Anchor supports. General specifications. Moscow : IPK Izdatelstvo standartov, 2003. 15 p.