Improving Rock Fragmentation Using Airdeck Blasting Technique

S. Saqib, S. M. Tariq, Z. Ali

Abstract


The airdeck blasting technique has been used in the past to reduce the explosive charge and to improve the rock fragmentation. The mining and construction industry of Pakistan has always been reluctant to use airdecks in their blasting operations. This is due to the fact that researchers and practitioners have a divided opinion about the efficiency of this technique. The present research work addresses the fundamental question regarding the technical and economic efficiency of the airdeck blasting technique. A series of experiments was conducted using concrete blocks to find out the proper position and optimized length of the airdeck. It is found that an improved rock fragmentation is achieved when the airdeck is placed at the middle position of the explosive column. Moreover, it is also observed that the mean blasted rock fragment size increases with the increase of airdeck size.

Full Text:

PDF

References


John. L. Floyd (2004). A report on power deck optimization prepared by blast dynamics, Inc.

Holloway D.C., Wilson W.H.(1986).A Study of bench blasting in instrumented concrete blocks. University of Maryland Final Report, prepared for U.S. Bureau of Mines, Twin Cities Research Center, Contract No.SO245046.

Bjarnholt G., Skalare H.(1983).Instrumented model scale blasting in concrete. In First International symposium on Rock Fragmentation by Blasting Holmberg R. and Rustan A. eds (Lulea: Lulea University), Vol.2, pp799-814.

Applied Explosives Technology for Construction and Mining; Applex, Arla,(1990).

Jhanwar J. C., Jethwa J. L., Reddy A.H. (2000). Influence of airdeck blasting on fragmentation in jointed rocks in an open pit manganese mine. Engineering Geology 57, 13-29.

Chiappetta R. F., (2004). New blasting techniques to eliminate sub-grade drilling improve fragmentation; reduce explosive consumption and lower ground vibration. Journal of Explosive Engineering.

Hayat and Tariq. (2012) Optimization of Bench Blasting using Airdeck Blasting Technique, MSc. thesis, The University of Engineering and Technology Lahore, Pakistan.

Mel’nikove, N.V., Marchenko, L.N.(1971). Effective Methods of Applications of Explosive Energy in Mining and Construction, 12th U.S. Symposium Dynamic Rock Mechanics (New York, AIME), chap. 18, pp35-378.

Fourney W.L., Barker D.B. and Holloway D.C. (1981). Model Studies of explosives well stimulation techniques. Int. j. Rock Mech.& Min. Sci. 18, pp113-27.

Jhanwer J.C., Jethwa J.L. (2000). The use of airdeck in production blasting in an open pit coal mine. Geotechnical and Geological Engineering.18, pp269-287.

Thote N.R., Singh D.P. (2000). Effect of airdecking on fragmentation: A few case studies of Indian mining. Explosives and Blasting Technique. Rotterdam, ISBN 90 5809 1 686.

Moxon, N.T., Mead D. Richardson, S.B.(1993) Airdecked blasting techniques: some collaborative experiments. Transaction of the institution of Mining and Metallurgy. Section A. Mining Industry. Vol. 102,pp. A25-30.

Jhanwar, J. C. (2011). Theory and practice of airdeck blasting in mines and surface excavation, A Review, Geotechnical and Geological Engineering. 10.1007/s10706-011- 9425-x.

Jhanwer J. C.: Cakarborty A.K. : Anireddy H. R.: and Jethwa J.L: (1999) Application of airdecks in production blasting to improve fragmentation and economics of an open pit mine, Geotechnical and Geological Engineering 17: pp. 37-57.

Liu L, Katsabanis PD (1996) numerical modeling of the effects of airdecking/decoupling in production and controlled blasting. Rock fragmentation by blasting, Monhanty (ed.) Balkema, Rotterdam.pp319-330.






Copyright (c) 2016 S. Saqib

Powered By KICS