Mining Institute, Perm Federal Research Center, Ural Branch, Russian Academy of Sciences, Perm, Russia:

S. S. Andreiko, Head of Laboratory, Professor, Doctor of Engineering Sciences, ssa@mi-perm.ru
O. V. Ivanov, Researcher, Candidate of Engineering Sciences
E. A. Nesterov, Researcher, Candidate of Engineering Sciences

The case studies of sudden squeezing in face salt rock mass shows that the single method available currently to prevent damage effect produced by these gas-dynamic events on mine personnel is equipment of shearers with shields that are sometimes break and fail to protect personnel. The article considered different methods to prevent gas-dynamic events in potash mines under shearing. It is shown that gas-dynamic process control in face areas can be performed by means of active degassing of salt rock mass ahead of the face (gas drainage hole drilling, making degassing–stress relieving grooves) and by passive technique of making a rational form face. These solutions to be applied require scientific evaluation of heading equipment, advanced drilling parameters and mining technology. The most inexpensive but efficient way to solve the problem of sudden squeezing of face salt rocks is development of organizational and technical measures aimed to prevent damage effect of rock blocks ejected during squeezing of mine personnel in the face area. The minimal parameters of rock blocks capable to break shearer shields are determined. Safe distance for a shearer operator to implement remote control with the eliminated damage due to rock ejection from face slat rock mass during squeezing is found. To solve the problem of squeezing at the Starobinskoe deposit special organizational and technological measures are applied. In the west and east of Mine 2 field and in the north of Mine-3 field, extraction panels are prepared for mining only using shearer Ural-61 and heading machines that make concave planar face. Under face rock mass squeezing, such form of the faces allows directing the gas-and-salt flow to the center of the excavation, to the shearing device, which enables prevention of broken rock ejection beyond the shearer shield and into the face area. After the introduction of the shearers making concave–planar faces, injuries of miners under squeezing of face salt rock mass ceased.

1. Quanlong L., Xinchun L. Effective stability control research of evolutionary game in China’s coal mine safety supervision. Journal of Beijing University of Technology. 2015. Vol. 17(4). pp. 49–56.
2. Warren J. K. Evaporites: A Geological Compendium. 2^nd ed. Cham : Springer, 2016. 1812 p.
3. Li Z., Wang E., Ou J., Liu Z. Hazard evaluation of coal and gas outbursts in a coal-mine roadway based on logistic regression model. International Journal of Rock Mechanics and Mining Sciences. 2015. Vol. 80. pp. 185–195.
4. Wang S., Elsworth D., Liu J. Rapid decompression and desorption induced energetic failure in coal. Journal of Rock Mechanics and Geotechnical Engineering. 2015. Vol. 7, Iss. 3. pp. 345–350.
5. Proskuryakov N. M., Kovalev O. V., Meshcheryakov V. V. Gas-Dynamic Control in Potassium Strata. Moscow : Nedra. 1988. 239 p.
6. Andreyko S. S., Ivanov O. V., Nesterov E. A., Golovatiy I. I., Beresnev S. P. Research of salt rocks gas content of potash layer in the Krasnoslobodsky mine field. Eurasian Mining. 2013. No. 2. pp. 38–41.
7. Zakharov N. I., Polyanina G. D. Prediction of sudden salt and gas outbursts at the Inder deposit by geological signs. Salt Rock Mining : Collection of Scientific Papers. Perm. 1977. pp. 142–146.
8. Zhikharev S. Ya., Polyanina G. D., Paderin Yu. N. Method to prevent dynamic events in Berezniki Mines 2 and 3. Potash Mining Technology and Safety: Collection of Scientific Papers. Perm. 1985. pp. 104–108.
9. Asanov V. A., Anikin V. V., Beltyukov N. K., Evseev A. V., Toksarov V. N. Tool control method of strain-stress state of marginal salt rocks. Eurasian Mining. 2013. No. 2. pp. 20–24.
10. Kovalev O. V., Livensky V. S., Bylino L. V. Features of Safe Potash Rock Mass Development. Minsk : Polymya. 1982. 96 p.
11. Polyaninovana G. D., Vinogradov Yu. A. Rockburst control in carnallite seam using stress-relief and gas drainage holes. Physical Processes in Mining : Collection of Scientific Papers. Moscow : MGI. 1994. pp. 51–53.
12. Bachurin B. A., Borisov A. A. Up-to-date gas-geochemical technologies for control of technogenesis processes during exploration of resources at Verkhnekamsky region. Eurasian Mining. 2013. No. 2. pp. 42–45.
13. Petrosyan A. E., Ivanov B. M., Krupenya V. G. Theory of Outbursts. Moscow : Nauka. 1983. 152 p.
14. Shadrin A. V., Geophysical criterion of pre-outburst crack propagation in coal beds. Journal of Mining Science. 2016. Vol. 52, No. 4. pp. 670–682.
15. Andreiko S. S., Kirienko V. M. Outburst control in zones of geological faulting in mines at the Starobinskoe potash deposit. Gornaya mekhanika. 2000. No. 3–4. pp. 38–41.
16. Andreiko S. S. Methods of advanced prevention of outbursts in potash seams. Gornaya mekhanika. 2004. No. 3–4. pp. 91–97.
17. Shcherba V. Ya. Prevention of gas-dynamic events in potash mine in the CIS countries. Dynamic and Gas-Dynamic Events in Potash Mines. Moscow : Gornaya Kniga. 2004. pp. 3–8.
18. Petukhov I. M., Linkov A. M., Sidorov V. S., Feldman I. A. Theory of Protective Seams. Moscow : Nedra. 1976. 223 p.
19. Dyagilev R. A., Shulakov D. Y., Verkholantsev A. V., Glebov S. V. Seismic monitoring in potash mines: observation results and development aspects. Eurasian Mining. 2013. No. 2. pp. 24–28.