Krukovska V., Krukovskyi O., Yanzhula O., Kostrytsia A., Kocherga V. The influence of the features of outburst-prone rocks position in the floor of the stope on stress fields and degasation process

Details

Parent Category: Geo-Technical Mechanics, 2024

Category: Geo-Technical Mechanics, 2024, Issue 168

Geoteh. meh. 2024, 168, 139-151

https://doi.org/10.15407/geotm2024.168.139

 

THE INFLUENCE OF THE FEATURES OF OUTBURST-PRONE ROCKS POSITION IN THE FLOOR OF THE STOPE ON STRESS FIELDS AND DEGASATION PROCESS

¹Krukovska V., ¹Krukovskyi O., ²Yanzhula O., ¹Kostrytsia A., ¹Kocherga  V.

¹M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine

²Coal Directorate METINVEST HOLDING LLC

UDC 622.267.5

Language: English

Abstract. Rock-gas outbursts happen when mine workings are driven near low-permeability sandstones, which contain gas under high pressure, and most of such outbursts are triggered by shot firing. In particular, when sections of the powered support are clamped in the stope, it is necessary to explode the rock under them, which is dangerous if the outburst-prone sandstone is located in the floor of the stope. One of the factors causing the rock-gas outburst is a certain combination of the stress-dependent permeability of the sandstone and the near-floor rock and gas pressure. Therefore, the purpose of the work is to study the change in the stress state of the host rocks and gas filtration process in the outburst-prone sandstone located in the floor of the stope, with different composition of the near-floor rocks. To achieve the goal, methods of numerical simulation of time-dependent processes of elastic-plastic deformation and gas filtration were used. A stope with sections of the powered support was considered, in the floor of which siltstone and outburst-prone sandstone are located. The computations were performed with variations in the thickness and strength of the siltstone bed above the sandstone.

It is shown that the values of the maximum and minimum components of the principal stress tensor gradually decrease in the floor of the stope, the sandstone is unloaded from the rock pressure. This leads to an increase in its permeability, the start of the methane filtration and degasation process. The composition of near-contour rocks greatly affects the distribution of geomechanical and filtration parameters. In the presence of the siltstone bed with a certain strength, a not unloaded bridge with lower permeability appears above the sandstone, and its degasation slows down significantly. If the thickness of the siltstone bed increases, the width of this bridge also increases, and methane filtration in the floor of the stope stops. In this case it is an obstacle that delays or completely prevents the degassing of gas-bearing rocks that lie below.

The results of the above analyses should aid evaluation of potential measures to prevent the rock-gas outburst during blasting operations for the movement of sections of powered support in the stope. A better understanding of this problem could save considerable time and expense for future technological operations in similar mining conditions.

Keywords: rock-gas outburst, rock deformation, coupled processes, stope, gas filtration, numerical simulation.

REFERENCES

1. Butt, S.D., Frempong, P.K., Mukherjee, C. and Upshall, J. (2006), “Characterization of the permeability and acoustic properties of an outburst-prone sandstone”, Journal of Applied Geophysics, no. 58, pp. 1–12. https://doi.org/10.1016/j.jappgeo.2005.04.002

2. Aston, T., Kullmann, D. and Barron, K. (1990), “Modelling of outbursts at # 26 Colliery, Glace Bay, Nova Scotia. Part 1. Outburst history and field data”, Mining Science and Technology, no. 11, pp. 253–260. https://doi.org/10.1016/0167-9031(90)90945-O

3. Li, X.Z. and Hua, A.Z. (2006), “Prediction and prevention of sandstone-gas outbursts in coal mines”, International Journal of Rock Mechanics and Mining Sciences, no. 43(1), pp. 2–18. https://doi.org/10.1016/j.ijrmms.2005.03.021

4. Mineev, S.P. (2018), “Some issues on blast-free mining of prone-to-outburst rocks”, Geо-Technical Mechanics, no. 138, pp. 37–92. https://doi.org/10.15407/geotm2018.01.037

5. Butt, S.D. (1999), “Development of an apparatus to study the gas permeability and acoustic emission characteristics of an outburst-prone sandstone as a function of stress”, International Journal of Rock Mechanics and Mining Sciences, no. 36, pp. 1079–1085. https://doi.org/10.1016/S1365-1609(99)00067-2

6. Kullmann, D. and Barron, K. (1990), “Modelling of outbursts at 26 Colliery, Glace Bay, Nova Scotia. Part 3: Comparison of model results and field data”, Mining Science and Technology, no. 11, pp. 269–280. https://doi.org/10.1016/0167-9031(90)90969-Y

7. Krukovska, V.V., Krukovskyi, O.P., Kocherga, V.M. and Kostrytsia, A.O. (2022), “Solving coupled problems of geomechanics and gas filtration for mining safety ensuring”, Geо-Technical Mechanics, no. 160, pp. 106–122. https://doi.org/10.15407/geotm2022.160.106

8. Krukovskyi, O.P., Krukovska, V.V. and Kostrytsia, A.O. (2024), “Numerical study of time-dependent stresses in the floor of the stope with powered support”, IOP Conference Series: Earth and Environmental Science, no. 1348 (1), 012030. https://doi.org/10.1088/1755-1315/1348/1/012030

9. Cheng, G. (2015), “Discussion of sandstone outburst mechanism by rock drivage in deep mine coal-bearing strata”, Advanced Materials Research,no. 1092–1093, pp. 1388–1393. https://doi.org/10.4028/www.scientific.net/AMR.1092-1093.1388

10. Guo, C., Xian, X., Li, X., Yao, W. and Jiang, Y. (2009), “Outburst orientation of sandstone under gravitational field”, Journal of University of Science and Technology Beijing, no. 31(12), pp. 1487–1492.

11. Baranov, V.A. (2000), Structural transformations of Donbass sandstones and forecast of their outburst hazard, D. Sc. Thesis, Geology of solid fossil fuels, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, Dnipropetrovsk, Ukraine.

12. Bezruchko, K.A. (2016), “Determination of parameters of the reservoir-screen boundary for low-porosity sandstones of the coal-bearing strata”, Coal of Ukraine, no. 11–12, pp. 58–63.

13. Bezruchko, K.A. (2023), “The impact of moisture content on outburst hazard of sandstones in coal-bearing strata international journal of earth sciences knowledge and applications”, International Journal of Earth Sciences Knowledge and Applications, no. 5(3), pp. 343–350. https://www.ijeska.com/index.php/ijeska/article/view/348/326

14. He, M.C., Nie, W., Zhao, Z.Y. and Guo, W. (2012), “Experimental investigation of bedding plane orientation on the rockburst behavior of sandstone”, Rock Mechanics and Rock Engineering, no. 45, pp. 311–326. https://doi.org/10.1007/s00603-011-0213-y

15. Barron, K. and Kullmann, D. (1990), “Modelling of outbursts at # 26 Colliery, Glace Bay, Nova Scotia. Part 2: Proposed outburst mechanism and model”, Mining Science and Technology, no. 11, pp. 261–268. https://doi.org/10.1016/0167-9031(90)90957-T

16. Shevelev, G.A. (1993), “Mechanism of development and attenuation of coal, rock and gas outbursts”, Geo-Technical Mechanics, no. 1, pp. 46–49.

17. Bulat, A.F. and Bezruchko, K.A. (2015), Sistema voda-gaz v massive gornyih porod Donbassa [Water-gas system in the Donbass rock massif], Naukova dumka, Kyiv, Ukraine.

18. Li, X.Z., Zhang, D. and Hua, A.Z. (2002), “Influence of fluid pressure change on the deformation and stress state of surrounding rockmass of boreholes and caverns”, Geological Journal of China Universities, no. 8, pp.106–112.

19. Bulat, A.F., Krukovskyi, O.P. and Krukovska, V.V. (2024), “Deformation of gas-bearing rocks and gas filtration during excavation of mine workings”, International Applied Mechanics, no. 60(1), pp. 10–19. https://doi.org/10.1007/s10778-024-01259-9

20. Krukovska, V.V., Krukovskyi, O.P. and Demchenko, S.V. (2023), “Numerical analysis of the possibility of noxious gases infiltration into a shelter located in a gas-bearing coal-rock mass”, Geо-Technical Mechanics, no. 166, pp. 95–108. https://doi.org/10.15407/geotm2023.166.095

21. Labuz, J.F. and Zang, A. (2012), “Mohr-Coulomb Failure Criterion”, Rock Mechanics and Rock Engineering, no. 45, pp. 975–979. https://doi.org/10.1007/s00603-012-0281-7

22. Jiang, H. (2015), “Failure criteria for cohesive-frictional materials based on Mohr-Coulomb failure function”, International Journal for Numerical and Analytical Methods in Geomechanics, no. 39, pp. 1471–1482. https://doi.org/10.1002/nag.2366

23. Krukovskyi, O.P., Mineev, S.P., Krukovska, V.V. and Belikov, I.B. (2021), “The influence of working seam thickness on permeability of barrier pillars near isolated fire sections”, Geо-Technical Mechanics, no. 158, pp. 3–15. https://doi.org/10.15407/geotm2021.158.003

24. Krukovska, V.V. and Kocherga, V.M. (2022), “Influence of the method of gate road protection on the operating efficiency of methane drainage boreholes“, IOP Conference Series: Earth and Environmental Science, no. 970, 012045. https://doi.org/10.1088/1755-1315/970/1/012045

25. Rust, W. (2012), Non-Linear Finite Element Analysis in Structural Mechanics, Springer, Hannover, Germany.

26. de Borst, R., Crisfield, M.A., Remmers, J.J.C. and Verhoosel, C.V. (2012), Non-linear finite element analysis of solids and structures, John Wiley & Sons, London, UK. https://doi.org/10.1002/9781118375938

27. Zienkiewicz, O.C., Taylor, R.L. and Zhu, J.Z. (2013), The Finite Element Method: Its Basis and Fundamentals, Butterworth-Heinemann, Amsterdam, Netherlands.

28. Shkuro, L.L. (2005), “Studies of basic indexes collector properties, which to influence on methanogenetiс sandstones”, Geо-Technical Mechanics, no. 59, pp. 170–175. http://dspace.nbuv.gov.ua/handle/123456789/141314

29. Lukinov, V.V., Toropchyn, O.S., Hunia, D.P., Kaplanets, M.E. and Radovanov, S.V. (2005), “Problems of superficial degassing on the coal deposits”, Geо-Technical Mechanics, no. 53, pp. 138–143.

 

About the authors:

Krukovska Viktoriia, Doctor of Technical Sciences (D.Sc.), Senior Researcher, Senior Researcher in Department of Dynamic Manifestations of Rock Pressure, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-7817-4022

Krukovskyi Oleksandr, Corresponding Member of NAS of Ukraine, Doctor of Technical Sciences (D.Sc.), Deputy Director of the Institute, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0000-0002-2659-5095

Yanzhula Oleksii, Candidate of Technical Sciences (Ph.D.), Director for Technical Development and Investments, Coal Directorate METINVEST HOLDING LLC, Pokrovsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. , ORCID 0009-0000-8906-0656

Kostrytsia Andrii, Postgraduate Student, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Kocherga Viktor, Candidate of Technical Sciences (Ph. D), Сhief Technologist in Department of Pressure Dynamics Control in Rocks, M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine (IGTM of the NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

• < Prev
• Next >