New possibilities of reducing blasting vibrations with an improved prognosis

Abstract The standard charge weight scaling laws consider the distance and the maximum charge per delay interval as the only technological factors influencing the peak particle velocity (PPV). Practical experience, however, indicates that drilling- and blasting technology significantly contribute to the PPV. For that reason an attempt is made to improve the prognosis by including a well-known empirical evaluation procedure generally used for the quantification of the specific blasting effect. A correlation between these parameters was derived on the basis of numerous large hole blastings carried out under normal working conditions. Then the vibration immission of the blasts was statistically evaluated under consideration of the measurement site and the comparability of the conditions. The result of this analysis allows the following three fundamental conclusions: 1. Vibrations can significantly be reduced by improving the ignition frequency, and by optimising the delay interval and the ignition in the bor...