A new approach in blast vibration analysis and prediction at iron ore mines

Authors: Singh, P. K.; Sirveiya, A. K.; Roy, M. P.; Prasad, Avinash; Mohapatra, Tarapada

Source: Mining Technology, Volume 114, Number 4, 2005 , pp. 209-218(10)

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Abstract:

Uncertainties in vibration analysis from blasts can be attributed to the problem of determining the actual amount of explosive detonating within a specific time interval, and the number of holes effectively contributing to the resulting particle velocity. This paper describes the results of a systematic study carried out to investigate these effects at iron ore mines in India. It involved a total of over 42 blasts, employing one-, two- and three-hole calibration studies, and regular production blasts. In the latter, the bench height varied from 6 m to 14 m, and boreholes loaded with ANFO and Emulsion explosives were 100 mm and 160 mm in diameter. The in-the-hole velocity of detonation of explosives was monitored. Six tri-axial vibration sensors were located on ground surface along a linear array from 25 m to 1·54 km from the blast sites, to investigate the changes in amplitude, frequency, and duration with distance. Responses of various structures (including one- and two-story homes) to blast vibration were taken to investigate the impact of blast wave frequencies on vibration level on the structures. The study compares single-hole blast signatures with multi-hole ones, and provides guidelines on determining the 'effective' charge-weight in vibration analysis of such blasts. Optimum delay intervals between two detonations have been recommended to control vibrations and their impact on the structures.

Keywords: BLAST VIBRATION ANALYSIS; FREQUENCY; IRON ORE MINES

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/037178405X74095

Publication date: 2005-12-01

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