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

Table 2

Monitoring data of blasting-induced vibration at different points.

Monitoring points	Position of monitoring points	Maximal segment explosive quantity (kg)	Distance from explosive sources (m)	Peak velocity (cm/s)
				Radial	Tangential	Vertical
1	Haunch	2.75	17.2	1.61	1.45	1.44
	Spandrel	2.75	17.9	2.23	2.04	2.02
	Arch foot	2.75	18.6	0.91	0.96	1.02
2	Haunch	2.75	14.1	3.07	2.91	2.88
	Spandrel	2.75	14.4	4.32	4.10	4.08
	Arch foot	2.75	15.9	2.13	2.06	2.00
3	Haunch	2.75	11.9	8.01	7.92	5.05
	Spandrel	2.75	12.5	8.36	7.91	7.21
	Arch foot	2.75	14.2	4.54	4.39	4.34
4	Haunch	2.75	12.9	3.42	3.27	3.34
	Spandrel	2.75	13.5	3.67	3.43	3.46
	Arch foot	2.75	15.1	2.07	1.95	1.85
5	Haunch	2.75	15.6	1.98	1.80	1.13
	Spandrel	2.75	16.2	2.50	1.79	1.11
	Arch foot	2.75	17.4	0.86	0.76	0.75