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An Analytical Approach to Measure the Probable Overlapping of Holes Due to Scattering in Initiation System and Its Effect on Blast-Induced Ground Vibration in Surface Mines

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Abstract

Rock breakage using blasting is one of the important operations of the mining industry. The delay timing decides the initiation sequence of holes in the blasts and is a crucial factor to improve the overall blast performance. Blast-induced ground vibration is an undesired yet unavoidable outcome of blasting. Peak particle velocity (PPV) is commonly used to measure the magnitude of blast-induced ground vibration. Channelization and better utilization of explosive energy delay are provided between blast holes using initiating systems. The use of different initiation systems even on the same site results in a very significant difference in the values of PPV generated. Due to scattered delay timings of pyrotechnic detonators, the scaled distance predictor equations obtained become unreliable. The error/scatter in delay timing leads to overlapping of holes and hence increases in maximum charge per delay. In this paper, an analytical approach has been discussed to measure the overlapping of holes during blasting with initiation systems having inherent cap scatter. The analytical approach will be calculating the probable overlapping of holes due to scatter in delay timing and will help blasting engineers to understand the variation in maximum charge per delay due to pyrotechnic based initiating systems. In this study, a total number of 102 blasts were conducted using different initiation systems at two different opencast coal mine and 221 corresponding blast vibrations events were recorded.

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Acknowledgments

The authors express their thankfulness to the mine management of “Amalgamate Joyrampur Colliery Lodna Area of Bharat Coking Coal Limited (BCCL)” and “Gondudih Colliery, BCCL” for allowing us to conduct the study in the mines. The study was conducted with the appropriate permission of the competent authority in presence of blasting officers of the mines.

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Authors and Affiliations

  1. Central Mine Planning and Design Institute Limited, Coal India Limited, Ranchi, India

    Hemant Agrawal

  2. Department of Mining Engineering, Indian Institute of Technology (ISM), Dhanbad, India

    Arvind Kumar Mishra

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  1. Hemant Agrawal
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  2. Arvind Kumar Mishra
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Correspondence to Hemant Agrawal.

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Agrawal, H., Mishra, A.K. An Analytical Approach to Measure the Probable Overlapping of Holes Due to Scattering in Initiation System and Its Effect on Blast-Induced Ground Vibration in Surface Mines. Mining, Metallurgy & Exploration 38, 485–495 (2021). https://doi.org/10.1007/s42461-020-00350-2

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