Analysis of Three-Dimensional Vibration Characteristics of Single-Circle Double-Track Subway Tunnel under Moving Load

Table 1

Physical and mechanical parameters of soil layer.

Layer	Thickness (m)	Density (kg·m^−3)	Compression modulus (MPa)	Poisson’s ratio (ν)	Cohesion (kPa)	Internal friction angle (°)	Damping ratio (ζ)	Rayleigh damping (α)	Rayleigh damping (β)
Filling	4	1800	5.3	0.32	9	12.5	0.08	0.2391	0.02675
Clay	12	1830	6.2	0.28	35.2	25.1	0.068	0.2033	0.00274
Silty	34	1970	6.9	0.29	41	18.1	0.06	0.1794	0.02006