Effect of Initiation Location within Blasthole on Blast Vibration Field and Its Mechanism

Table 6

Measured PPVs in the production blasting experiment.

Sensor no.	R (m)	PPV (cm/s)
		S1 (top initiated)				S2 (bottom initiated)
		Radial	Tangential	Vertical	Vector	Radial	Tangential	Vertical	Vector
#1	26	3.21	6.63	9.62	12.12	6.26	11.38	35.46	37.76
#2	42.5	2.51	2.96	7.13	8.12	6.39	3.29	9.89	12.23
#3	53.1	1.55	1.6	2.67	3.48	4.98	2.88	5.08	7.67
#4	61.2	1.57	1.17	2.5	3.18	3.38	2.51	5.14	6.64
#5	83.4	1.08	0.90	1.45	2.02	2.19	1.27	2.05	3.26