Parameters Optimization of Curtain Grouting Reinforcement Cycle in Yonglian Tunnel and Its Application

Table 3

Basic parameters.

Name	Size (m)	Elastic modulus (GPa)	Gravity (KN/m^3)	Poisson’s ratio	Internal friction angle (°)	Cohesion (MPa)	Permeability (m^2)
The fourth grade surrounding rock	200 × 180	1.5	18.5	0.40	24	0.13	5.0 × 10^−11
Grouting reinforcement cycle	d	1.5 M	19	0.21	45	0.65
Lining	0.8 (thickness)	25	25	0.25	50	1.5	5.0 × 10^−13