Research on Effects of Blast Casting Vibration and Vibration Absorption of Presplitting Blasting in Open Cast Mine

Table 5

Actual blast vibration detection data and absorption shock rate of presplit blasting.

Detection point distance to blasting center/m	Velocity of vibration/cm·s^−1
	200	400	600	800	1000	1200	1400
Presplit blasting	5.48	2.21	1.3	0.89	0.66	0.52	0.43
Non-presplit blasting	11.01	3.97	2.18	1.43	1.03	0.79	0.63
Vibration reduction ratio	50.2%	44.3%	40.4%	37.8%	35.9%	34.2%	31.7%