Research on Design Parameters and Fatigue Life of Tunnel Bottom Structure of Single-Track Ballasted Heavy-Haul Railway Tunnel with 40-Ton Axle Load

Table 2

The physical and mechanical parameters of materials.

Structure	Elastic modulus (GPa)	Poisson’s ratio	Density (kN·m^-3)	Cohesion (kPa)	Friction angle (°)
Ballast	32.0	0.18	25.0
Filling layer	29.0	0.18	25.0
Invert	30.0	0.18	25.0
Second lining	30.0	0.18	25.0
Primary lining	27.5	0.18	25.0
Surrounding rock	1.5	0.36	19.5	200	42