Stability Analysis of the Lining Reinforcement Structure of a Double-Track Heavy-Haul Railway Tunnel

Table 2

Material parameters.

Project	Elastic modulus (GPa)	Poisson ratio	Ultimate tensile value (MPa)	Density (kg/m^3)
Existing concrete lining	15.75	0.2	1.1	2500
Fresh concrete	31.5	0.2	2.2	2500
Steel frame	210	0.3	420	7850