Dynamic Response of Parallel Overlapped Tunnel under Seismic Loading by Shaking Table Tests

Table 5

Acceleration energy ratio of the crown and invert under different amplitude seismic waves.

Monitoring point		0.2				0.4				0.6
		A3	A4	A5	A6	A3	A4	A5	A6	A3	A4	A5	A6
Energy ratio of each frequency band (%)	E1	79.71	80.60	89.94	77.33	78.10	48.14	87.16	89.96	74.33	48.93	80.52	83.56
	E2	16.94	14.10	6.67	18.58	19.64	40.70	10.28	8.55	22.83	40.73	16.47	14.55
	E3	0.65	0.79	0.67	1.51	0.67	1.36	0.60	0.55	0.81	1.26	0.78	0.65
	E4	1.53	2.79	1.08	1.22	1.28	8.77	1.45	0.52	1.58	7.99	1.78	0.83
	E5	0.06	0.08	0.07	0.06	0.02	0.05	0.02	0.01	0.02	0.05	0.02	0.02
	E6	0.43	0.60	0.57	0.13	0.05	0.23	0.05	0.04	0.07	0.24	0.06	0.04
	E7	0.29	0.43	0.54	0.99	0.18	0.33	0.35	0.33	0.23	0.43	0.29	0.27
	E8	0.39	0.61	0.56	0.17	0.07	0.42	0.10	0.05	0.12	0.37	0.09	0.06