Inversion Study of Mechanical Parameters of Tunnel Surrounding Rock Based on Similar Test

Table 1

Material parameters.

Materials	Weight capacity (kN⋅m^−3)	Modulus of elasticity (MPa)	Cohesion (kPa)	Poisson’s ratio	Internal friction angle (°)
IV perimeter rock	20	5000	1600	0.3	31
Similar materials	20	50	16	0.3	31