Influence of Base Rock Deterioration on Tunnel Bottom Structure Damage under Train Excitation

Table 4

Calculation conditions of a discrete element.

Working condition number	Surrounding rock classification	Train axle (kN)	High-speed flow (m/s)	Service time
1	V	300	2 m/s∼14 m/s	One month
2			2 m/s∼15 m/s	Six months
3			2 m/s∼16 m/s	Two years
4			2 m/s∼17 m/s	Four years