Shaking Table Tests for Seismic Response of Oblique Overlapped Tunnel

Table 3

Orthogonal design of similar material ratios.

Mechanical parameters	Material ratio
	E (GPa)	ρ (kg∗m^−3)	C (kPa)	ϕ (°)
1. Cement: coarse sand: soil: water = 1 : 15 : 5 : 2	0.32	2420	11.26	39.61
2. Cement: coarse sand: soil: water = 2 : 15 : 5 : 2	0.23	2440	23.95	42.64
3. Cement: coarse sand: soil: water = 1 : 12 : 5 : 2	0.10	2260	24.42	35.85
4. Cement: coarse sand: soil: water = 0.5 : 12 : 5 : 2	0.14	2270	10.47	34.80
5. Cement: coarse sand: soil: water = 0.5 : 10 : 5 : 2	0.19	2350	11.76	36.09
Prototype (grade IV surrounding rock)	1.3–6	2000–2300	200–700	27–39