Shaking Table Tests for Seismic Response of Orthogonal Overlapped Tunnel under Horizontal Seismic Loading

Table 3

Parameters of the shaking table system.

Parameters	Technical specification
Table size (m)	4 × 6
Maximum bearing capacity (t)	25
Loading direction	Horizontal (X), vertical (Z), horizontal–vertical (XZ)
Range of operating frequency (Hz)	X	0.1–70
	Z	0.1–50
	XZ	0.1–50
Maximum acceleration (g)	X	1.7
	Z	1.2
	XZ	1.2
Maximum displacement (mm)	X	±250
	Z	±100
	XZ	±150