Krukovskyi O.P., Krukovska V.V., Kurnosov S.А., Yanzhula O.S., Bulich Yu.Yu. Study of permanent workings stability when they are driven through the gob of relieving longwall
- Details
- Parent Category: Geo-Technical Mechanics, 2023
- Category: Geo-Technical Mechanics, 2023, Issue 165
Geoteh. meh. 2023, 165, 51-63
https://doi.org/10.15407/geotm2023.165.051
STUDY OF PERMANENT WORKINGS STABILITY WHEN THEY ARE DRIVEN THROUGH THE GOB OF RELIEVINGLONGWALL
1Krukovskyi O.P., 1Krukovska V.V., 1Kurnosov S.А.,2Yanzhula O.S., 1Bulich Yu.Yu.
1M.S. Poliakov Institute of Geotechnical Mechanics of the National Academy of Sciences of Ukraine, 2Coal Directorate METINVEST HOLDING LLC
UDC 622.831.24
Language: English
Abstract. The method of permanent workings construction, the type of supporting, as well as their location relatively to the boundaries of stopping operations zones greatly affect their stability. In this work, a numerical simulation of the stress state of the layered rock mass with permanent workings located in the gob of previously mined longwall was completed to study these mine workings stability outside the influence of stopping operations and in the zone of their influence. As an example, the mining and geological conditions were considered for the central panel of block 11 in PJSC Colliery Group "Pokrovske", where four permanent mine workings are planned. A series of calculations were performed with variations of such technological parameters as the distance between mine workings, the impact of stopping operations, and the pillar size between the gob of the relieving longwall and the active front of working face.
It is shown that a change in the distance between permanent mine workings in the range of 50–70 m does not affect the lack of mutual influence between these mine workings. When the front of stopping operations in the adjacent longwall approaches the permanent workings, the load on the support pillar between the boundary of stopping operations and the gob of relieving longwall, as well as on support of first permanent mine working, increases considerably. If the support pillar size is 80 m, the impact of the stopping operations spreads close to the first permanent working and affects the stability of the second permanent working. The approach of active longwall leads to an additional lowering of the first mine roof by 120–208% compared to the level at the stage of stabilization of the stress-strain state. The region of increased difference in main stresses around the first permanent working occupies a large area; its stability deteriorates, although thanks to the bolting, the monolithic rock-bolt arch is still preserved in its roof. However, the pillar size of 80 m is critical (for the mining and geological conditions adopted in this work); further reduction of the pillar size will lead to loss of stability of the first permanent mine working. An increase in the depth of permanent workings by 300 m, in addition to a natural increase in the initial stress state of the rock mass, also leads to a 10–12% increase in the boundaries of the influence of the abutment pressure.
|Keywords: gob of relieving longwall, numerical simulation, rock bolting, stopping operations, support of permanent workings.
REFERENCES
1. Lin’kov, A. (2001), “On the Theory of Pillar Design”, Journal of Mining Science, vol. 37, no. 1, pp. 10–27. https://doi.org/10.1023/A:1016724616864.
2. Hodyrev, E.D. (2010), “Determination of the limiting dimensions of protective coal pillars and the stresses acting in them”, Transactions of UkrNDMI NAN Ukraine, no. 6, pp. 170–180.
3. Krukovskyi,O.,Bulich, Y., Kurnosov,S., Yanzhula, A. and Dyomin,V. (2022), “Substantiating the parameters for selecting a pillar width to protect permanent mine workings at great depths”, IOP Conference Series: Earth and Environmental Science, no. 970, 012049. https://doi.org/10.1088/1755-1315/970/1/012049.
4. Zborshchyk, M.P. and Nazymko, V.V. (1991), Ohrana vyirabotok glubokih shaht v zonah razgruzki [Protection of deep mine workings in unloading zones], Tekhnika, Kyiv, Ukraine.
5. Ju, J., Xu, J. and Zhu, W. (2015), “Longwall chock sudden closure incident below coal pillar of adjacent upper mined coal seam under shallow cover in the Shendong coalfield”, International Journal of Rock Mechanics and Mining Sciences, no. 77, pp. 192–201. https://doi.org/10.1016/j.ijrmms.2015.04.004
6. Kovalevska, I., Samusia, V., Kolosov, D., Snihur, V. and Pysmenkova, T. (2020), “Stability of the overworked slightly metamorphosed massif around mine working”, Mining of Mineral Deposits, vol. 14, no. 2, pp. 43–52. https://doi.org/10.33271/mining14.02.043
7. Zborshchik, M., Kasian, N., Kliuev, A. and Azamatov, R. (1996), “Geomechanical processes in the zone of destroyed rocks in the vicinity of supported workings”, Coal of Ukraine, no. 4, pp. 7–9.
8. Nehrii, S., Nehrii, T. and Piskurska, H. (2018), “Physical simulation of integrated protective structures”, E3S Web Conf., Ukrainian School of Mining Engineering, no. 60, pp. 00038. https://doi.org/10.1051/e3sconf/20186000038
9. Tripolski, V.N., Buryak, N.A. and Vojtovich, Т.G. (2018), “Technological schemes for supporting reused gate roads by the cast strips”, Geo-Technical Mechanics, no. 140, pp. 13–22. https://doi.org/10.15407/geotm2018.03.013
10. Vinogradov, V. (1989), Geomehanika kontrolja sostojanija gornyh massivov vblizi gornyh rabot [Geomechanics of Massif Condition Control Near Mine Working], Naukjva Dumka, Kyiv, Ukraine.
11. Krukovskyi, O.P. (2011), “Modeliuvannia zminy napruzheno-deformovanoho stanu prykonturnoho masyvu pry vidkhodi zaboiu hirnychoi vyrobky” [Modelling changes of stress-strain state of solid edge during the distance of working face of mine workings], Problemy obchysliuvalnoi mekhaniky i mitsnosti konstruktsii, no. 17, pp. 175–181.
12. 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
13. Wang, H.C., Zhao, W.H., Sun, D.S. and Guo, B.B. (2012), “Mohr-Coulomb yield criterion in rock plastic mechanics”, Chinese Journal of Geophysics, no. 55, pp. 733–741. https://doi.org/10.1002/cjg2.1767
14. Bulat, A.F. and Vynohradov, V.V. (2002), Oporno-ankerne kriplennia hirnychykh vyrobok vuhilnykh shakht [Bearing-bolt supporting of mine workings in coal mines], IGTM NAS of Ukraine, Dnipropetrovsk, Ukraine.
15. Zienkiewicz, O.C., Taylor, R.L. and Zhu, J.Z. (2013), The Finite Element Method: Its Basis and Fundamentals, Butterworth-Heinemann. https://doi.org/10.1016/C2009-0-24909-9
16. 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. https://doi.org/10.1002/9781118375938
17. Eslami, M.R. (2014), Finite Elements Methods in Mechanics, Springer International Publishing. https://doi.org/10.1007/978-3-319-08037-6
18. Krukovskyi, O.P., Krukovska, V.V., Bulich, Yu.Yu. and Zemlianaia, Yu.V. (2020), “Some aspects of development and application of the bearing-bolt supporting technology”, Resource-saving technologies of raw-material base development in mineral mining and processing. Multi-authored monograph, Universitas Publishing, Petroșani, Romania, pp. 123–142. https://doi.org/10.31713/m908
19. Krukovskyi, O.P., Krukovska, V.V., Adorska, L.H. and Bulich, Yu.Yu. (2022), “Development and application of the bearing-bolt supporting technology in the conditions of Ukrainian coal mines”, Journal of Donetsk Mining Institute, vol. 2, no. 51, pp. 55–68. https://doi.org/10.31474/1999-981X-2022-2-54-66
About the authors:
Krukovskyi Oleksandr Petrovych, Corresponding Member of the NAS of Ukraine, Doctor of Technical Sciences (D. Sc), Deputy Director of the Іnstitute, 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. .
Krukovska Viktoriia Viktorivna, Doctor of Technical Sciences (D. Sc), Senior Researcher, Senior Researcher 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. .
Kurnosov Serhii Anatoliovych, Doctor of Technical Sciences (Sci.D), Senior Researcher, Senior Researcher in Department of Mineral Mining at Great Depths, 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. .
Yanzhula Oleksii Serhiovych, 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. .
Bulich Yurii Yuriiovуch, Master of Science, Researcher in Department of Rock Mechanics, 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. .