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

Table 1

Parameters of shaking table system.

Parameters	Technical specification
Table size (m)	3 × 2
Loading direction	Horizontal (X)
Working frequency (Hz)	0.2∼50
Maximum load (t)	0.5
Maximum acceleration (g)	1.0
Maximum overturning moment (kN·m)	10
Maximum eccentric moment(kN·m)	5
Maximum velocity (m/s)	2
Maximum displacement (mm)	51