A Comparative Study of Ground and Underground Vibrations Induced by Bench Blasting

Table 2

Vibration measurements taken in tunnel.

Blast	Bench	, maximum charge by delay (kg)	, distance (m)	PPV (mm/s)	Frequency (Hz)
1	628	174	313	0.7	14.6
2	628	175	102	15.1	31.1
		175	132	14.3	32.3
		175	172	6.3	32.3
3	628	175	262	1.3	32.9
		175	217	2.1	33.9
		175	141	5.2	32.9
		175	120	3.1	32.3
4	628	175	107	15.0	32.9
		175	144	4.7	32.9
		175	186	5.8	32.9
5	628	175	335	2.3	31.7
		175	228	2.1	32.9
		175	207	6.3	32.9
6	628	173	267	1.6	30.5
7	628	175	205	6.2	16.5
		175	132	4.3	31.7
		175	141	7.6	33.6
8	628	175	259	1.5	29.9
		175	211	5.4	33.6
9	628	175	236	2.9	34.3
		175	154	3.9	35.4
10	628	175	176	4.5	35.4
11	616	175	140	5.1	35.4
		175	127	15.9	33.5
12	628	175	175	3.8	35.4
		175	171	3.2	33.6
13	628	173	104	3.9	62.0
		173	252	7.1	33.6
14	616	174	141	5.7	32.3
		174	108	6.2	35.0
		174	95	13.5	33.6
15	628	175	202	4.8	34.2
16	628	173	230	5.5	61.0
		173	107	24.5	88.8
		173	99	12.5	95.2
17	628	175	194	3.9	34.2