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

N. A. Litvinovskaya, Researcher, Candidate of Engineering Sciences, nlitvinovskaya@mail.ru
A. S. Papulov, Engineer

Belaruskali JSC, Soligorsk, Belarus:
A. B. Petrovsky, Deputy Chief Engineer of Mining
I. A. Podlesny, Chief Engineer

The article comprehensively describes a research technique for the potential risk of gas dynamic phenomena in roof rocks in entries. At the present time, Belaruskali’s Mine 3 is arranging mining operations in the fourth sylvinite layer in potassium stratum III, undercut by stoping in the lower lying sylvinite layers. In this connection, at the level of 620 m in Starobin potash field, the risk of rock bursts with gas emission in roof rocks during entry heading in the mined-out stoping void is assessed. The gas content and gas dynamics assessment in roof rocks included in-mine research in different geotechnical conditions of entry heading. The research findings show that in the layer of rocks at the depth more than 4 m, undermining operations promote accumulations of free gases at interfaces. These free gas nests are the potential sources of gas dynamic phenomena in the form of rock bursts and gas emission in roof rocks. For the safe heading of entries in the mined-out stoping void, it is recommended to perform preventive drilling in roof rocks. It is expedient to make provisions for the preventive gas drainage in roof rocks: at junctions of entries and T stopes; at junctions of entries and process connections at intersections with T stopes; at junctions of entries and process connections between drifts in rib pillars; in vehicle maneuver rooms.

1. Galkin V. I., Andreyko S. S., Litvinovskaya N. A., Galkin S. V., Lyalina T. A. Studies of halopelite content in the B-V rock salt layer of the Verkhnekamsk potassium-magnesium salt deposit. Gornaya promyshlennost. 2022. No. 4. pp. 103–108.
2. Zakharov V. N., Malinnikova O. N. Outbursting risk in face areas of gas-bearing coal seams under mining. Gornyi Zhurnal. 2018. No. 12. pp. 81–85.
3. Odintsev V. N., Makarov V. V. Dynamic Fracture of Gas-Bearing Coal Seam during Zonal Disintegration. Journal of Mining Science. 2020. Vol. 56, Iss. 6. pp. 932–946.
4. Kubrin S. S. Multifunction system to predict hazardous gas-dynamic phenomena in coal mines. Gornyi Zhurnal. 2017. No. 11. pp. 97–100.
5. Kai Wang, Feng Du. The classification and mechanisms of coal-gas compound dynamic disasters: a preliminary discussion. International Journal of Mining and Mineral Engineering. 2019. Vol. 10, No. 1. pp. 68–84.
6. Black D. J. Review of coal and gas outburst in Australian underground coal mines. International Journal of Mining Science and Technology. 2019. Vol. 29, Iss. 6. pp. 815–824.
7. Liang Chen, Enyuan Wang, Jianchun Ou, Jiangwei Fu. Coal and gas outburst hazards and factors of the No. B-1 Coalbed, Henan, China. Geosciences Journal. 2017. Vol. 22, No. 1. pp. 171–182.
8. Zhou Peiling, Zhang Yinghua, Huang Zhian, Gao Yukun, Wang Hui et al. Coal and gas outburst prevention using new high water content cement slurry for injection into the coal seam. International Journal of Mining Science and Technology. 2017. Vol. 27, Iss. 4. pp. 669–673.
9. Shadrin A. V. Geophysical Criterion of Pre-Outburst Crack Propagation in Coal Beds. Journal of Mining Science. 2016. Vol. 52, Iss. 4. pp. 670–682.
10. Andreyko S. S., Ivanov O. V., Litvinovskaya N. A. Predication and prevention of gas dynamic events out of preparatory workings soul in underworked salt rock mass. Perm : Izdatelstvo PNIPU, 2015. 159 p.
11. Litvinovskaya N. A. Risk of gas dynamic phenomena in floor rocks in stopes in potassium stratum IV. Gornoe ekho. 2022. No. 1(86). pp. 139–145.
12. Andreyko S. S. Prevention of gas dynamic phenomena in ramp drivage to potassium stratum II in Starobin potash slat field. Strategy and Processes in Development of Geo resources : Collection of Scientific Papers. Perm, 2014. Vol. 12. pp. 227–229.
13. Beresnev S. P., Senyuk V. V., Gonchar V. I., Andreiko S. S., Litvinovskaya N. A. Research of the mechanism forming the zones that are dangerous on gas and dynamic phenomena in the First potash level rocks. Gornyi Zhurnal. 2010. No. 8. pp. 31–33.
14. Yuqi Shang, Lin Zhang, Dezhong Kong, Yang Wang, Zhanbo Cheng. Overlying strata failure mechanism and gas migration law in close distance outburst coal seams: A case study. Engineering Failure Analysis. 2023. Vol. 148. 107214. DOI 10.1016/j.engfailanal.2023.107214
15. Kolesnichenko I. E., Kolesnichenko E. A., Lyubomishchenko E. I., Kolesnichenko E. I. Mechanism of methane outbursting in coal seams. GIAB. 2020. No. 1. pp. 108–120.
16. Xiangjun Chen, Liyang Li, Lin Wang, Lingling Qi. The current situation and prevention and control countermeasures for typical dynamic disasters in kilometer-deep mines in China. Safety Science. 2019. Vol. 115, Iss. 16. pp. 229–236.
17. Kozieł K., Skoczylas N., Soroko K., Gola S. Gas and Dolomite Outbursts in Ore Mines – Analysis of the Phenomenon and the Energy Balance. Energies. 2020. Vol. 13, Iss. 11. 2999. DOI: 10.3390/en13112999
18. Sheng Xue, Qingyi Tu, Yuanwei Hao, Yang Yang, Zuheng Zhao et al. Occurrence and development criteria of coal and gas outbursts based on energy conversion. Fuel. 2023. Vol. 341. 127781. DOI: 10.1016/j.fuel.2023.127781
19. Proskuryakov N. M. Ground Control : Textbook. Moscow : Nedra, 1991. 368 p.
20. Andreiko S. S., Lyalina T. A. Capability assessment of gasdynamic effects development as sudden destruction of mine workings rocks of soil, accompanied by gas evolution, in conditions of the southern part of Verkhnekamskoe field. Vestnik PNIPU. Geologiya. Neftegazovoe i gornoe delo. 2013. Vol. 12, No. 7. pp. 107–115.