Performance of Super-Large-Span Tunnel Portal Excavated by Upper Bench CD Method Based on Field Monitoring and Numerical Modeling

Table 2

The physical and mechanical parameters of the rock mass.

Rock mass	Deformation modulus, E (GPa)	Poisson ratio, µ	Internal friction angle, φ (°)	Cohesion, C (MPa)	Volume weight (kN/m^3)
V2	3	0.35	23	0.66	18
V2 reinforced area	3	0.35	27.6	0.79	18