Analysis of Acoustic Wave Frequency Spectrum Characters of Rock Mass under Blasting Damage Based on the HHT Method

Table 5

Theoretical and practical time lags of the detonators.

Time-lag level	Theoretical time delay (ms)	Time-lag level	Theoretical time-lag interval (ms)	Practical time-lag interval (ms)	Practical time delay (ms)
1	<13	—	—	—	—
2	25 ± 10	1∼2	2∼35	26	26
3	50 ± 10	2∼3	5∼45	29	55
4	75 ± 15	3∼4	0∼50	31	86
5	110 ± 15	4∼5	5∼65	27	113
7	200 ± 20	5∼7	55∼125	73	186
8	250 ± 25	7∼8	5∼95	24	210