Study on Internal Vibration Law and Vibration Reduction of Xiaoxiku Tunnel Blasting

Table 2

Vibration reduction rate under different delay time intervals.

Delay time (ms)	Positive peak vibration (cm/s)	Negative peak vibration velocity (cm/s)	Positive vibration reduction rate	Negative vibration reduction rate
0	1.820	2.122	0	0
1	1.623	1.906	10.82%	10.18%
2	1.477	1.545	18.85%	27.19%
3	1.392	1.484	23.52%	30.07%
4	1.283	1.359	29.51%	35.96%
5	0.844	0.898	53.63%	57.68%
6	0.493	0.458	72.91%	78.42%
7	0.271	0.199	85.11%	90.62%
8	0.398	0.191	78.13%	91.00%
9	0.521	0.231	71.37%	89.11%
10	0.482	0.258	73.52%	87.84%
11	0.369	0.325	79.73%	84.68%
12	0.392	0.378	78.46%	82.19%
13	0.374	0.318	79.45%	85.01%
14	0.464	0.356	74.51%	83.22%
15	0.378	0.487	79.23%	77.05%