Research Article

Numerical Analysis of Vibration Responses in High-Speed Railways considering Mud Pumping Defect

Table 1

Dynamic properties of the vehicle, slab track, and subgrade system.

ItemsValues

Vehicle system
Car body mass (kg)41600
Bogie mass (kg)3200
Wheelset mass (kg)2000
Primary suspension stiffness (N/m)1.176 × 106
Primary suspension damping (N·s/m)1.96 × 104
Secondary suspension stiffness (N/m)6 × 105
Secondary suspension damping (N·s/m)9.8 × 103
Track system
Young’s modulus of the rail (N/m2)2.059 × 1011
Area moment of inertia of the rail (m4)3.217 × 10−5
Mass per unit length of the rail (kg/m)60.64
Stiffness of rail pad (N/m)5.0 × 107
Damping of rail pad (N·s/m)7.0 × 104
Density of the slab (kg/m3)2500
Young’s modulus of the slab (N/m2)3.6 × 1010
Poisson’s ratio of the slab0.2
Stiffness of the CA mortar (N/m)3 × 105
Damping of the CA mortar (N·s/m2)3.46 × 104
Density of the concrete base (kg/m3)2500
Young’s modulus of the concrete base (N/m2)3.25 × 1010
Poisson’s ratio of the concrete base0.2
Subgrade system
Density of the upper layer of subgrade bed (kg/m3)2140
Young’s modulus of the upper layer of subgrade bed (N/m2)2 × 108
Poisson’s ratio of the upper layer of subgrade bed0.3
Density of the bottom layer of subgrade bed (kg/m3)1900
Young’s modulus of the bottom layer of subgrade bed (N/m2)1.5 × 108
Poisson’s ratio of the bottom layer of subgrade bed0.3
Density of the subgrade body (kg/m3)1900
Young’s modulus of the subgrade body (N/m2)1 × 108
Poisson’s ratio of the subgrade body0.35