ANALYSIS OF MAINGATES STABILITY IN STEP COAL SEAMS DURING PROTECTION BY COAL PILLARS

Keywords: steep coal seam, coal pillars, lateral rocks, roof displacement, cross-sectional area, excavation area.

Abstract

The purpose of the work. Studying the stability of haulage drifts of steep coal seams with the method of protecting coal by pillars. An integrated approach was used as research methods, including: a full-scale experiment, analytical studies, interpretation of the results obtained. To assess the durability of mine workings, full-scale experiments were carried out to study the manifestations of rock pressure in the haulage drifts with the method of protecting coal by pillars, when the magnitude of the change in the cross-sectional area and the convergence of side rocks on the contour of the development workings along the length of the excavation section was established. It is fixed that at the maximum relative deformation of coal pillars (ε ≈ 0,7), the loss of the cross-sectional area of the haulage drifts at a distance of l ≥ 60 m behind the working face is more than 50 %, which does not correspond to the operational state of the workings. When studying the deformation properties of protective structures, it was found that after their deformation by 10–20 %, an increase in the convergence of side rocks in the haulage drifts begins, a distortion of the shape and loss of the bearing capacity of coal pillars. The distortion of the shape of the security structures contributes to the intensification of the displacements of the roof on the contour and is accompanied by a deterioration in the durability of the haulage drifts in the excavation areas of the coal mine. It has been proved that on a steep drop, with the method of protecting the haulage drifts with coal pillars, the change in the cross-sectional area of the excavation occurs along a linear relationship with an increase in the length of the excavation section due to the distortion of the shape and loss of the bearing capacity of the security structures. To improve the safety of miners in the excavation areas of coal mines developed steeply falling coal seams, it is recommended to abandon the method of protecting the haulage drifts with coal pillars. To avoid emergencies associated with the collapse of the roof, it seems advisable to use purposeless methods of protection – flexible structures or backfilling of the goaf.

References

Nikolin, V. I., Podkopaev, S. V., Agafonov, A. V., Maleev, N. V. (2005). Snizhenie travmtizma ot proyavleniy gornogo davleniya. Donetsk : Nord-Press, 332 c.

Levkin, N. B. (2002). Preduprezhdenie avariy i travmatizma v ugolnyih shahtah Ukrainyi. Donetsk: Donbass, 396 s.

Levkin, N. B., Kuzmenko, N. S. (2003). Osobennosti obvalov i obrusheniy v ochistnyih zaboyah. Geotehnicheskaya mehanika: Mezhved. sb. nauchn. tr. Vyip. 41 / IGTM NAN Ukrainyi. Dnepropetrovsk, 31–35.

Podkopaiev, S., Gogo, V., Yefremov, I., Kipko1, O., Iordanov, I., Simonova, Yu. (2019). PHENOMENA OF STABILITY OF THE COAL SEAM ROOF WITH A YIELDING SUPPORT. Mining of Mineral Deposits. Vol. 13 Issue 4, 28–41, https://doi.org/10.33271/mining13.04.028

Selezen, A. L., Tomasov, A. G., Andrushko, V. F. (1977). Podderzhanie podgotovitelnyih vyirabotok pri razrabotke krutyih plastov. Moskva : Nedra, 205 s.

Viktorov, S. D., Goncharov, S. A., Iofis, M. A., Zakalinskiy, V. M. (2019). Mehanika sdvizheniya i razrusheniya gornyih porod. In-t problem kompl. osvoeniya nedr im. akad. N. V. Melnikova. RAN. Moskva: RAN, 360 s. ISBN 978-5-907036-13-0. URL: http://www.ras.ru/FStorage/Download.aspx?id=96c79def-d4aa-4145-9116-53f6ac414ebc

Zhukov, V. E. (2001). Ob odnoy strategicheskoy oshibke v razreshenii problemyi razrabotki krutyih plastov. Ugol Ukrainyi. № 7. 6–10.

Liashok, Ya., Iordanov, I., Chepiga, D., Podkopaiev, S. (2018). Experimrntal studies of the seam openings competence in different methods of protection under pitch and steep coal seams development. Mining of Mineral Deposits. Vol. 12, Issue 4, 9–19. doi: 10.1547// mining 12.04.009. URL: http://mining.in.ua/2018vol12_4_2.html

Vlasenko, D. S., Rodichev, A. S. (2014). Opredelenie intensivnosti gornogo davleniya pri ohrane vyirabotok tselikami shirinoy menee 15 m. Gornyiy informatsionno-analiticheskiy byulleten. № 3, 135–139. URL: https://cyberleninka.ru/article/n/opredelenie-intensivnosti-gornogo-davleniya-pri-ohrane-vyrabotok-tselikami-shirinoy-menee-15- m/viewer

Iordanov, I., Novikova, Yu., Simonova, Yu., Korol, A., Podkopayev, Ye., Kayun, O., Dovgal, V., Boychenko, H., Hryhorets, M. (2020). Determining stability conditions for haulage drifts protected by coal pillars. Eastern-European Journal of Enterprise Technologies 6/1 (108). 72–81. DOI: 10.15587/1729-4061.2020.216530

Hartman, H. L. (1987). Introductory Mining Engineering. Wiley, Interscience Publication., 622 p.

Koshelev, K. V., Petrenko, Yu. A., Novikov, A. O. (1990). Ohrana i remont gornyih vyirabotok. Moskva: Nedra, 256 s.

Shashenko, A. N., Pustovoytenko, V. P., Sdvizhikova, E. A. (2016). Geomehanika. Kiev: Novyiy druk, 528 s. ISBN 978- 617-635-088-0

Chernyaev, V. I. (1987). Raschet napryazheniy i smescheniy porod pri razrabotke svityi plastov. Kiev: Tehnika, 148 s.

Sturzhanov, V. V., Burmasheva, N. V. (2019). Teoriya uprugosti: osnovanie polozheniya. Ekaterinburg: Izd-vo Ural. un-ta, 204 s. ISBN 978-5-7996-2541-2. URL : http://elar.urfu.ru/handle/10995/68501

Meshkov, Yu. Ya. (2001). Kontseptsiya kriticheskoy plotnosti energii v modelyah razrusheniya tverdyih tel. Uspehi fiz. met./ Usp.Fiz.Met., t. 2., 7–50. URL: https://ufm.imp.kiev.ua/ru/abstract/v02/i01/007.html

Kochergarov, G. G. (2007). Energiya i mehanizm kvazimikroplasticheskoy deformatsii tverdyih tel. Pisma v ZhTF, tom 26, Vyip.11, 41–46.

Sadd, M. H. (2014). Elasticity: Theory, Applications, and Numerics. 3rd Ed. Academic Press, Elsevier. ISBN: 978-0-12- 408136-9. URL: https://www.twirpx.com/file/1362060/

Semenov, V. A. (2013). Teoriya veroyatnosti i matematicheskaya statistika. Sankt-Peterburg: Piter, 192 s. ISBN 978-5- 496-00120-5. URL: https://www.studmed.ru/semenov-v-a-teoriya-veroyatnostey-i-matematicheskaya-statistika_11044b029e5.html

Sveshnikov, A. (2012). Prikladnyie metodyi teorii veroyatnosti. Sankt-Peterburg: Izd-vo Lan, 480 s. ISBN 978-5-8114- 1219-8. URL: https://e.lanbook.com/book/3184

Ahn, H. (Ed.) (2017). Probability and Statistics for Science and Engineering with Examples in R. USA: Cognella Inc. 337 p. ISBN 1496374959. URL: https://www.twirpx.com/file/2661680/

Akanbay, N. (2020). Probability theory and mathematical statistics. Book 1. Almaty: Qazaq University, 359 p. ISBN 978- 601-04-4563-5. URL: https://www.twirpx.com/file/3332504/

Taboga, M. (2017). Lectures on Probability Theory and Mathematical Statistics - 3rd Edition. CreateSpace Independent Publishing Platform, р. 670. URL: https://www.amazon.com/Lectures-Probability-Theory-Mathematical-Statistics/dp/1981369198

Polyanskiy, A. D., Zaytsev, V. F. (2018). Spravochnik po nelineynyim uravneniyam matematicheskoy fiziki. Moskva: Fizmatlit, 688 s. ISBN 978-5-457-96-5904. URL: https://www.twirpx.com/file/114870/

Borovkov, A. (2010). Matematicheskaya statistika. Sankt-Peterburg: Izd-vo Lan, 704 s. ISBN 978-5-8114-1013-2. URL: https://e.lanbook.com/book/3810

Published
2021-03-31
How to Cite
Iordanov, I., Kohtieva, O., Simonova, Y., Dovgal, V., Boichenko, H., Hryhorets, M., & Buleha, I. (2021). ANALYSIS OF MAINGATES STABILITY IN STEP COAL SEAMS DURING PROTECTION BY COAL PILLARS. Labour Protection Problems in Ukraine, 37(1), 16-27. https://doi.org/10.36804/nndipbop.37-1.2021.16-27