Influence of Arch Foot Defect of Primary Support on Mechanical Behaviors of an Arch Frame in Underground Tunnels

Table 2

Mechanical parameters of granite.

Surrounding rock	Young’s modulus, (MPa)	Poisson’s ratio,	Cohesion, (MPa)	Internal friction angle, (°)	Density, (kg/m^3)
Strongly weathered	1300	0.35	0.1	27	2250
Moderately weathered	1600	0.35	0.2	27	2300
Slightly weathered	2000	0.34	0.2	30	2400