Failure of Estimation of Expected Seismic Speed of Vibration Based on the Valid General Safety Regulation of Blasting

Abstract

Preparing technical description of explosion seismic safety stand-off distance and expected seismic speed of vibration have to be determined in every case. Practical experiences and the examples presented in the study clearly show that the real magnitude of  these values of seismic speed were higher than they were calculated previously based on the correlations given by the General Safety Regulation of Blasting. The differences between the calculated and experienced values derive from the wrongly chosen “K” factor. The characteristic of the rocks and the explosives, the factor of acoustic and geometric join and the physical characteristics of the soil of foundation of the defended building are only partially taken into consideration by the fix values of “K” factor. In the study the following suggestions for transformation in regulations of General Safety Regulation of Blasting were drafted out: standard charge sizes, the maximum scale of speed of vibration generated by industrial and mining blast, and the expected value of the speed of vibration.