A Numerical Analysis of Ground Vibration Induced by Typical Rail Corrugation of Underground Subway

Table 3

Calculation parameters of track and tunnel.

Element	Parameter	Notation	Unit	Value
Rail	Mass per unit length	Mr	kg/m	60.64
	Young’s modulus	Er	GPa	210
	Moment of inertia	Ir	m^4	3.22 × 10^−5
Rail pad	Support spacing	—	m	0.625
	Stiffness	Kp	MN/m	35
	Damping	Cp	kN·m/s	20
Slab	Length	L	m	5.6
	Width		m	2.5
	Thickness	h	m	0.4
	Density	ρs	kg/m^3	2500
	Young’s modulus	Es	GPa	35
Tunnel	Outside diameter	R	m	3.0
	Inside diameter	R	m	2.7
	Density	ρt	kg/m^3	2500
	Young’s modulus	Et	GPa	32.5