Presplit Blasting for Stabilization of Highwall Slopes and Productivity Enhancement in a Trench-Mining Project
Keywords:
presplit blasting;trench highwall mining;slope angle; controlled blastingAbstract
Stabilization of highwall slope by implementing presplit blasting and productivity enhancement by improving the powder factor using controlled blasting at Sharda project of South Eastern Coalfields Ltd. (SECL) was the endeavour of the research team of CSIR-CIMFR in the first trench highwall mining of India. Good fragmentation was achieved through improved rock-explosive interactions and redefined design parameters in the trench which had restricted width and lesser initial powder factor (in m3/kg) due to varying rock-geologic and rock-explosive characteristics. Through systemic analysis of blast-results and implementation of scientific theories combined with the usage of rock parameters and its physico-mechanical properties, it could possible to achieve around 2.0 m3/kg powder factor instead of 1.3-1.4 m3/kg maintaining stable highwall benches with 700or more slope angle. The work led to huge cost benefits in explosive consumption for the company i.e. M/s Cuprum Bagrodia Ltd. and also markedly reduced the environmental implications from production blastsduring day-to-day operations.
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References
CSIR-CIMFR Report of Investigations. (2014): In-situ trench slope stability study at Sharda opencast highwall mining project, SECL. CNP/N/3715/2013-14, August, p. 30.
CSIR-CIMFR Report of Investigations. (2015): Scientific study for improvement of blasting efficiency and presplit blasting for formation of highwall benches at Sharda highwall mining project. CNP/4012/2014-15, June, p. 15.
Porathur, John Loui, Pal Roy, Pijush, Shen, Baotang & Karekal, Shivakumar, (2017): Highwall Mining: Applicability, Design & Safety (Chapter-4, pp.158-168), Taylor & Francis Group plc. (CRC Press), UK, June, p. 323.
ISEE Blasters’ Handbook (18th Edition). (2011): International Society of Explosives Engineers (ISEE), USA, p. 1040.
Konya, C. J. and Walter, E. J., (1990): Surface blast design, Prentice Hall Int., USA, p. 303.
Olofsson, S. O. (1998): Applied Explosives Technology for Construction and Mining. Pub. Rotterdam: Balkema, pp. 183-186.
Jimeno, L. C., Jimeno, L. E. and Carcedo, A. J. F., (1995): Drilling and Blasting of Rocks, Pub. Balkema: Rotterdam, The Netherlands, p. 391.
Hagan, T. N. and Mercer, J. K., (1983): Safe and efficient blasting in open pit mining. Proceedings of Workshop held by ICI Australian Operation Limited, Karratha, 23-25 November.
Calder, P., (1977): Perimeter Blasting, Pit Slope Manual, CANMET Report 77-14, Chapter 7, p. 82.
Chiapetta, R. F., (2001): The importance of presplitting and field controls to maintain stable high walls, eliminate coal damage and over break, Proc. 10th Hightech Seminar on State of the Art Blasting Technology, Instrumentation and Explosive Application, GI-48, Nashville, Tennessee, USA, 22-26 July.
Persson, P. A., Holmberg, R. and Lee, J., (1994): Rock Blasting and Explosive Engineering, CRC Press, Boca Raton, Florida, p. 540.
Gustafsson, Rune, (1973): Swedish Blasting Techniques, SPI, Guttenberg, Sweden, p.328.