Elastoplastic Analysis of Two-Layered Circular Lining Based on the Unified Strength Theory

Table 1

Parameters of examples.

	Single-layered lining	Two-layered lining (Case i)	Two-layered lining (Case ii)
Radii, R (m)	R0=0.3, R2=0.5	R0=0.3, R1=0.4, R2=0.5	R0=0.3, R1=0.4, R2=0.5
Young’s modulus, E (GPa)	E1=E2=41 (K=41/41)	E1=25, E2=41 (K=25/41)	E1=41, E2=25 (K=41/25)
Poisson’s ratio, μ	0.24	0.24	0.24
UCS, (MPa)	50	==50	==50