Field Investigation of Blasting-Induced Vibration in Concrete Linings during Expansion of Old Highway Tunnel

Table 2

Observed main vibration frequency for the examined case history.

Test number	TNT weight per delay (kg)	Distance to blasting source (m)	Main vibration frequency of new concrete lining (Hz)			Distance to blasting source (m)	Main vibration frequency of old concrete lining (Hz)
			FX	FY	FZ		FX	FY	FZ
1	50.4	R2 = 20.3	45.62	117.14	89.65	R3 = 29.6	123.25	93.95	113.28
		R1 = 42.7	40.25	23.53	18.90	R4 = 110.8	11.72	23.43	23.45
2	27.3	R2 = 19.7	119.61	127.97	64.52	R3 = 20.0	118.60	83.32	108.76
		R1 = 52.6	27.35	35.87	54.60	R4 = 74.2	37.45	27.62	18.55
3	31.2	R2 = 22.7	62.55	112.36	108.42	R3 = 40.4	28.98	127.65	105.26
		R1 = 44.0	44.68	50.29	72.68	R4 = 95.7	22.92	69.30	20.15
4	27.3	R2 = 31.6	75.69	67.45	25.68	R3 = 50.8	87.82	65.05	49.60
		R1 = 98.0	35.89	20.58	26.50	R4 = 70.9	17.87	35.65	28.37
5	31.2	R2 = 48.9	56.67	69.85	29.62	R3 = 37.2	122.05	78.62	60.25
		R1 = 109.5	29.68	25.46	19.60	R4 = 70.8	35.80	42.68	39.07
6	27.3	R2 = 29.9	39.83	67.79	130.34	R3 = 42.4	55.54	65.06	46.58
		R1 = 117.2	19.62	15.67	22.18	R4 = 101.5	22.15	32.58	28.40
7	31.2	R2 = 26.5	127.65	86.20	147.45	R3 = 55.3	78.52	65.43	45.09
		R1 = 71.3	38.66	42.18	19.57	R4 = 135.2	12.56	24.11	19.50
8	27.3	R2 = 36.2	83.34	69.22	74.05	R3 = 44.8	85.62	76.53	55.45
		R1 = 79.2	23.80	56.49	79.52	R4 = 156.6	13.68	17.98	26.80
9	31.2	R2 = 28.4	112.36	56.26	78.32	R3 = 87.0	25.68	102.60	39.86
		R1 = 78.6	42.32	65.24	25.60	R4 = 114.2	25.64	22.30	32.05
10	27.3	R2 = 42.9	57.29	61.07	87.00	R3 = 98.1	72.58	45.62	19.82
		R1 = 140.4	17.85	24.68	20.55	R4 = 120.4	42.26	22.80	21.09