Singh, P.K. and Roy, M.P. (2008) Low Frequency Vibrations Produced by Coal Mine Blasting and their Impact on Structures. Blasting and Fragmentation , 2 (1). pp. 71-89. ISSN 1937-6359

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Abstract

The measured response of residential structures is a critical indicator of troublesome or potentially damaging ground vibrations. A study was conducted to evaluate the response of structures situated in the periphery of four open-pit coal mines in India. Although, most of the structures were at far-off distances from the present blasting sites, an attempt was made to document the response of structures to blast vibration for future applications to optimize the blast designs for the safety of the structures. The study involved a total 215 blasts, employing one-, two- and three-hole calibration study, and production blasts. The bench height varied from 7.5 m to 42 m, and boreholes loaded with emulsion and slurry explosives were 250, 260, 270 and 310 mm in diameter. The explosive detonated in a blast were between 300-198400 kg whereas in a delay it was 33-24800 kg. Up to 12 tri-axial vibration sensors were located in overburden along a linear array from 25 m to 6.5 km distance from the blasts. Altogether, 1512 blast vibration signatures were recorded. Production and specially fired single-charge blasts allowed the determination of natural ground frequency. The fundamental frequency of the structures ranged between 3.13 to 10.6 Hz, the same as those of the ground vibrations. The amplification of vibration in the structures was in the range of 1.6 to 5.6. The study details the interaction between ground vibrations and selected structures, and the means to reduce amplification of vibrations in the structures and persistence of vibrations through improved blast design.

Item Type:	Article
Subjects:	Blasting
Divisions:	UNSPECIFIED
Depositing User:	Dr. Satyendra Kumar Singh
Date Deposited:	21 Dec 2011 05:54
Last Modified:	21 Dec 2011 05:54
URI:	http://cimfr.csircentral.net/id/eprint/434

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