[Retracted] Numerical Simulation Research on Optimization of Large Deformation Control Parameters in Layered Slate Tunnel

Table 1

Physical and mechanical parameters of main materials.

Category	Elastic modulus E/Gpa	Poisson’s ratio	Severe	Friction angle	Cohesion C/MPa
Mezzanine	0.185	0.24	1800	37	0.5
Surrounding rock	39.54	0.19	2702	—	—
Initial lining	20	0.2	2201	—	—
Second lining	25	0.2	2201	—	—