Performance of Slurry Shield Tunnelling in Mixed Strata Based on Field Measurement and Numerical Simulation

Table 3

Summary of lining, grout, and shield machine properties.

Specification	Reinforced concrete lining	Backfill grout		Shield machine
Bulk density (kN/m^3)	25	22		76
Young’s modulus (MPa)	35500	I level	36	210000
		II level	50
		III level	60
Poisson’s ratio	0.25	0.25		0.2
Thickness (m)	0.55	0.22		0.22