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Breakage assessment through cluster analysis of joint set orientations of exposed benches of opencast mines

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Summary

This paper substantiates, through three different case studies, that the breakage assessment of opencast bench blasting can be made scientifically through the analysis of joint set orientations of different exposed benches in association with the corresponding face direction. Joint orientations, dip and strike of bedding planes have a significant influence on rock breakage. They can have decelerating effects on blasting performance, which may be rectified by geological mapping, and subsequently modifying the blast design parameters.

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References

  • Pal Roy, P. and Singh, V.K. (1990) Slope stability studies by analysing fracture orientations of discontinuous rock at Chandmari Copper Project, Khetri, Rajasthan, Journal of Mines, Metals and Fuels, April–May, 81–3.

  • Pal Roy, P., Singh, R.B., Barman, B.K., Rao, D.G., Singh, M.M., Singh, S.K., Mondal, S.K., Jagdish, Pingua, B.M.K. and Dhar, B.B. (1993) Investigations into the causes of ‘cut-offs’ and remedies thereof and also to establish optimum and safe blast design for better fragmentation in Chasnalla OCP, SAIL. CMRI Report EC/64/92, May 1993, pp. 29.

  • Pal Roy, P., Barman, B.K., Singh, R.B. and Dhar, B.B. (1994a) Assessment of ground vibration and air overpressure due to blasting in limestone of Rajashree Cement, Indian Rayon and Industries Ltd., and advice for suitable measures to control them. CMRI Report GC/84/93, Feb. 1994, pp. 20.

  • Pal Roy, P., Singh, R.B., Mondal, S.K., Barman, B.K., Rao, D.G., Singh, S.K. and Dhar, B.B. (1994b) Optimisation of blasting pattern for better fragmentation at Bonjemehary OCP of Salanpur Area, ECL. CMRI Report GC/36/93, March 1994, pp. 19.

  • Knoya C.J. and Walter E.J. (1990) Surface Blast Design, Prentice Hall pp. 303.

  • Mahatab, M.A., Bolstad, D.D., Alldredge, J.R. and Shanley, R.J. (1972) Analysis of fracture orientations for input to structural models of discontinuous rock, US Bureau of Mines Report 7669, pp. 76.

  • Worsey, P.N. (1984) The effects of discontinuity orientation on the success of presplit blasting, Proceedings of 10th Conference on Explosives and Blasting Technique, Society of Explosives Engineers, Montville, OH, pp. 197–217.

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Authors and Affiliations

  1. Blasting Department, Central Mining Research Institute, Barwa Road, 826001, Dhandab, Bihar, India

    P. Pal Roy

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  1. P. Pal Roy
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Pal Roy, P. Breakage assessment through cluster analysis of joint set orientations of exposed benches of opencast mines. Geotech Geol Eng 13, 79–92 (1995). https://doi.org/10.1007/BF00421874

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  • DOI: https://doi.org/10.1007/BF00421874

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