THE RELATIONSHIP BETWEEN PEAK PARTICLE VELOCITY AND VIBRATION LEVEL ON BLAST VIBRATION

Vibration level (VL) is often used as an evaluation index for intensity of blast vibration on site. However, VL does not indicate an actual wave form of vibration velocity. VL is estimated by peak particle velocity (PPV) obtained from measurements of vibration acceleration, in depending on a relative expression between PPV and VL. On the other hand, differences of blasting methods are not taken into consideration for the relative expression. In this paper, the relative expression between PPV and VL is investigated by means of estimating simulations based on the number of overlapping holes. The A-value of the relative expression is proposed according to such factors as the difference of instantaneous detonator, delay detonator, number of blast-hole, blasting pattern and elapsed time in blast.