Ensuring Stability of Undermining Inclined Drainage Holes During Intensive Development of Multiple Gas-Bearing Coal Layers
- 1 — Sochi Research Center of the Russian Academy Sciences
- 2 — North Caucasian Institute of Mining and Metallurgy
- 3 — North Caucasian Institute of Mining and Metallurgy
- 4 — North Caucasian Institute of Mining and Metallurgy
At high rates of production face advance, requirements towards reliable operation of undermining drainage holes get raised. The issue of maintaining high intensity of gaseous seams development under naturally increasing gas content, mining depth and capacity of production equipment poses a problem. The greatest threat comes from the loss of hole stability in the bearing pressure affected zone (in front of the face) and in the intensive shift area of overhanging rock corbels (behind the face). Intensification of air leaks due to deformation of borehole channel leads to impoverishment of removed methane-air mixture and an increasing risk to disturb safe aerogas regime in the mining area. The paper describes a mechanism of how coal-face operations affect the state of underground holes and formation of overhanging rock corbels. A typification of basic kinds of borehole deformations is presented. Authors point out critical disadvantages of the most widely-used technological schemes of gaseous seams development under high load on the production face, which hinder normal operation of a gas drainage system. As a result of research, a dependency of shot hole number, as well as the distance between shot hole axes and the borehole, on the stress state of the borehole outline has been defined more precisely. Basing on that, a formula to calculate drilling parameters of the discharge hole system has been suggested. Implementation of these measures will allow to increase the efficiency of underground gas drainage and to maintain growing intensity of gaseous coal seam development.
- Golik V.I., Komashchenko V.I., Razorenov Yu.I. Technology of Rock Mass State Management with Conservation of Ground Surface. Orenburg: Universitet, 2017, p. 554 (in Russian).
- Grebenkin S.S. Tunnel Maintenance and Construction in the Deep Mines of Donetsk Basin. Donetsk: Kashtan, 2005, p. 256 (in Russian).
- Dmitrak Yu.V., Golik V.I., Venigor V.V. Geomechanical Pre-Requisites of Mining Tunnel Stability Maintenance during the Development of Water-Abundant Fields. Izvestiya Tul'skogo gosudarstvennogo universiteta. Nauki o Zemle. 2018. Iss. 1, p. 221-226 (in Russian).
- Zubov V.P. Status and Directions of Improvement of Development Systems of Coal Seams on Perspective Kuzbass Coal Mines. Zapiski Gornogo instituta. 2017. Vol. 225, p. 292-297. DOI: 10.18454/PMI.2017.3.292
- Kazanin O.I. On the Design Features of Underground Multiple Gassy Coal Seam Mining. Zapiski Gornogo instituta. 2015. Vol. 215, p. 38-45 (in Russian).
- Kas'yan H.H. Geomechanical Foundations of Rock Failure Zone Management around Mining Tunnels to Maintain Their Stability at Great Depths: Avtoref. dis. … d-ra tekhn. nauk. Donetskii natsional'nyi tekhnicheskii universitet. Donetsk, 2002, p. 35 (in Russian).
- Litvinenko V.S., Dvoinikov M.V. Justification of the Technological Parameters Choice for Well Drilling by Rotary Steer- able Systems. Journal of Mining Institute. 2019. Vol. 235, p. 24-29. DOl: 10.31897/PMI.2019.1.24
- Mustafin M.G. Modeling of Rock Massif Geomechanical State at Gas Extraction from Coal Seams. Zapiski Gornogo insti- tuta. 2015. Vol. 216, p. 57-61 (in Russian).
- Kostenko V.K., Zinchenko N.N., Brigida V.S., Salikhiradzh L. Justification of Shot Hole Discharge Parameters at the Heads of Gas Drainage Holes. Fiziko-tekhnicheskie problemy gornogo proizvodstva. 2012. N 15, p. 85-91 (in Russian).
- Brodskii V.Sh. Patent 1043320 SSSR. A Gas Drainage Method for Undermined Coal Seams in the Pillar Mining System. Opubl. 1983. Byul. N 35 (in Russian).
- Zuev V.A., Pogudin Yu.M., Kazanin O.I., Bobrovnikov V.N., Vovk A.I., Sal'nikov A.A., Buchatskii V.M., Bocharov I.P. Patent 2 282 030 RU. A Mining Method for Multiple Adjacent Gaseous Coal Seams. Opubl. 20.08.2006. Byul. N 23 (in Russian).
- Kostenko V.K., Brigida V.S., Zinchenko N.M. Utility Model 77829 U. A Gas Drainage Method for the Undermined Coal- Rock Massif. Opubl. 25.02.2013. Byul. N 4 (in Ukrainian).
- Kostenko V.K., Bulgakov Yu.F., Podkopaev S.V. et al. Prevention and Extinguishing of Underground Endogeneous Fires in Remote Locations. Don.: Noulidzh, 2010, p. 253 (in Russian).
- Black D., Aziz N. Actions to improve coal seam gas drainage performance. 11-th Underground Coal Operators' Confer- ence. Wollongong: University of Wollongong and the Australasian Institute of Mining and Metallurgy, 2011, p. 307-314.
- Black D., Aziz N. Improving UIS gas drainage in underground coal mines. Coal Operators' Conference. Wollongong: Uni- versity of Wollongong and the Australasian Institute of Mining and Metallurgy, 2008, p. 186-196.
- Brigida V.S., Zinchenko N.N. Methane release in drainage holes ahead of coal face. Journal of Mining Science. 2014. Vol. 50. N 5, p. 994-1000. DOI: 10.1134/S1062739114010098
- Kachurin N.M., Vorobev S.A., Vasilev P.V. Abandoned coal mines influence on atmosphere, environmental monitoring of coal mining and processing territories and preventive measures resources optimizing. XVIII International Coal Preparation Congress, 2016, p. 609-614. DOI: 10.1007/978-3-319-40943-6_93
- Szlazak N., Swolkiein J. The Effectiveness of the Methane Drainage of Rock-Mass with a U Ventilation System. Archives of Mining Science. 2016. Vol. 61. N 3, p. 617-634. DOI: 10.1515/amsc-2016-0044
- Xue F., Zhang N., Feng X., Zheng X., Kan J. Strengthening Borehole Configuration from the Retaining Roadway for Greenhouse Gas Reduction: A Case Study. PLoS ONE. 2015. N 10(1): e0115874, p.1-12. DOI: 10.1371/journal.pone.0115874