Impact of single-hole and multi-hole blasting on vibration parameters

摘要

Prediction of blast induced ground vibration and their associated parameter is very difficult and still remains unsolved. Magnitude of vibration, at a distance of concern, depends not only on charge per delay (CD) but also on total charge (TC) and the ratio between total charge and charge per delay (TCCD). Considering two case studies of Jaypee Cements viz., Naubasta and Bela mine, the paper emphasized that magnitude of vibration, acceleration, displacement, duration of vibration and time of peak magnitude varies with the variation of charge parameters. The paper also puts forward that for both single-hole and multi-hole blasting, the attenuation characteristics of magnitude of vibration and its associated parameters varied not only with respect to charge per hole or CD but also TC and TCCD. The authors, lastly, emphasized that to minimize the error between the predicted and observed magnitude, vibration data should be categorized with respect to attenuation characteristics i.e., magnitude of vibration under different attenuation characteristics should be predicted by different predictor equation. Moreover, three predictor equations, using the three charge parameters viz., CD, TC and TCCD, in place of Q in USBM equation, should be used for derivation of empirical equation for each range of distance and the equation having least standard error of estimation (SEE) for that range of distance should be selected as the best-fit predictor equation for that range of distance.