Dynamic Analysis of Metro Train-Monolithic Bed Track System under Tunnel Differential Settlement

Table 3

Material and geometric parameters of the metro train-monolithic track system.

Parameter	Value	Parameter	Value
Mass of carriage (t)	39.54	Mass of bogie (t)	3.52
Moment of inertia of carriage (t·m^2)	1328	Moment of inertia of bogie (t·m^2)	1.76
Length of carriage (m)	19	Mass of a wheel axle (t)	1.539
Distance between two bogies of a carriage (m)	12.6	Distance between two wheelsets of a bogie (m)	2.3
Stiffness of primary suspension (kN·m^−1)	1700	Damping of primary suspension (kN·s·m^−1)	60
Stiffness of secondary suspension (kN·m^−1)	450	Damping of secondary suspension (kN·s·m^−1)	60
Linear mass density of rail (kN·m^−1)	121.28	Bending stiffness of rail (kN·m^2)	12400
Stiffness of rail pad (kN·m^−1)	100000	Damping of rail pad (kN·s·m^−1)	50
Stiffness of wheel/rail interaction (kN·m^−1)	1.2 × 10^6	Linear mass density of monolithic track bed-tunnel lining system (t·m^−1)	18.6
Bending stiffness of monolithic track bed-tunnel lining system (kN·m^2)	2.23 × 10^8	Shear stiffness of monolithic track bed-tunnel lining system (kN·m^2)	1.74 × 10^7
Stiffness of soil foundation (MN·m^−1)	100	Damping of soil foundation (kN·s·m^−1)	3750