Singh, P.K. and Roy, M.P. (2005) A New Approach in blast vibration analysis and prediction at iron ore mines. transactions of the Institution of Mining & Metallurgy Sec. A, Mining Technology, 114 (4). pp. 209-218. ISSN 0371-7844

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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.

Item Type: Article
Uncontrolled Keywords: Blast vibration analysis, iron ore mines, frequency
Subjects: Blasting
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 22 Feb 2012 09:43
Last Modified: 22 Feb 2012 09:43

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