The Effect of Blast-Hole Arrangement, Delay Time, and Decoupling Charge on Rock Damage and Vibration Attenuation in Multihole Blasting

Table 5

Field tests data of blasting vibration [22].

Group	Measurement point	Distance (m)<	Single-hole		Multihole
			Charge quantity (kg)	PPV (cm/s)	Maximum charge per delay (kg)	Delay time (ms)	PPV [cm/s
1	1	18	10	1.765	10	50	1.853
	2	30		1.210			1.453
2	1	18	10	1.839	10	100	2.190
	2	30		1.821			2.043