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

Table 1

Surrounding rock parameters and structural parameters of Taihangshan Mountain Tunnel and Fuyingzi Tunnel.

Structure		Elastic modulus (GPa)	Poisson ratio	Unit weight (kN·m^−3)	Cohesion (MPa)	Friction angle (°)
Surrounding rock	Class V	2.0	0.24	20.3	0.012	38
Taihangshan Mountain/Fuyingzi heavy-haul railway Tunnel	Initial support	23.0	0.20	23.0
	Secondary lining	31.0	0.20	25.0
	Track bed	33.5	0.20	25.0
	Inverting fill	28.5	0.20	23.0
	Inverted arch	31.0	0.20	25.0