A Preliminary Study on the Design Method for Large-Diameter Deep-Hole Presplit Blasting and Its Vibration-Isolation Effect

Table 4

Monitoring data and vibration-isolation effect during presplit blasting.

Monitoring point	Point location	Rb (m)	Qd (kg)	(cm/s)		Vibration-isolation ratio (%)
				S = 4.0 m	S = 3.4 m
H1	Rear	100	10000	9.48	6.72	29.1
H2	Rear	200	10000	5.51	4.59	16.7
H3	Rear	300	10000	3.65	3.09	15.3
H4	Rear	400	10000	2.87	2.44	15.0
H5	Rear	500	10000	1.34	1.05	21.6
Y1	Side	200	10000	5.74	4.77	16.9
Y2	Side	250	10000	4.65	3.92	15.7
Y3	Side	350	10000	1.85	1.47	20.5
Y4	Side	450	10000	1.48	1.23	16.9
Y5	Side	550	10000	1.28	0.91	28.9
Y6	Side	850	10000	1.03	0.78	24.3