Blasting-Induced Vibration Response of the Transition Section in a Branching-Out Tunnel and Vibration Control Measures

Table 1

Optimized blasting design parameters.

Sections	Type of holes	Hole depth (m)	Number of holes	Single-hole explosive quantity (kg)	Maximal segment explosive quantity (kg)
1	Cut-hole	1.3	6	0.35	2.10
3	Cut-hole	1.3	4	0.30	1.20
5	Auxiliary hole	1.0	8	0.20	1.60
7	Auxiliary hole	1.0	11	0.20	2.20
9	Auxiliary hole	1.0	8	0.20	1.60
11	Auxiliary hole	1.0	9	0.20	1.80
13	Auxiliary hole	1.0	10	0.15	1.50
15	Periphery hole	1.0	12	0.15	1.80
17	Floor hole	1.2	11	0.25	2.75
Total			79		16.55