Large-Scale Shaking Table Test of Seismic Response Laws for a Shallow Double-Arch Tunnel under Unsymmetrical Pressure with a Damping Layer

Table 2

The main similarity constants of the model to prototype.

Physical quantity	Similar relation	Similar constants
L (m)		20
ρ (kg·m^−3)		1
E (MPa)		20
ε		1
σ (kPa)		20
Μ		1
T (s)		4.47
A (m·s^−2)		1
U (mm)		20
(mm·s^−1)		4.47
ω (Hz)		0.224
φ (°)		1
γ (kN·m^−3)		1
C (kN·m^−2)		20

L: length, ρ; density, E: elastic modulus, ε: strain, σ: stress, μ: Poisson ratio, T: time, a: acceleration, u: displacement, : velocity, ω: frequency, : internal friction angle, γ: specific weight, C: cohesion.