Optimization of Delay Sequencing in Multi-Row Blast using Single Hole Blast Concepts

• Published in: Journal of the Institution of Engineers (India): Series D Vol. 102; no. 2; pp. 453 - 460
• Main Authors: Sharma, Mukul, Choudhary, Bhanwar Singh, Kumar, Hemant, Agrawal, Hemant
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01.12.2021; Springer Nature B.V
• Subjects: Delay; Design optimization; Design parameters; Engineering; Ground motion; Original Contribution; Reduction; Structural damage; Superposition (mathematics); Vibration; Backbreak; Scaled distance; Single hole; Ground vibration; Delay sequence
• ISSN: 2250-2122; 2250-2130
• DOI: 10.1007/s40033-021-00270-5

The control of blast-induced ground vibration and generation of back break are main concerns of mine management. Because it damages structures near to the blasting face and makes highwall instable. It was observed during prediction of blast-induced ground vibration through scaled distance technique that it does not consider the superimposition effect of waves. Therefore, the predicted values of ground vibration differ from actual value. This study was conducted to see the superimposition effect using single hole blast concept and optimizing the blast design parameters. By this method, it is possible to nullify the chances of superimposition of waves and their influence on generation of blast-induced ground vibration and backbreak. From the study, it was found that at 92 ms delay between rows generate less backbreak compared to 42 ms and 67 ms delay. It has been found that a significant reduction in vibration can be achieved using 92 ms delay between rows, i.e., reduction up to 31% to 61% compare to 42 ms delay between row and 7% to 42% compare to 67 ms delay between rows, when blast intensity generated by single hole was 10 mm/sec.