Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling

Table 5

Material and state equation parameters of the air [28].

Density (kg/m^3)	C0	C1	C2	C3	C4	C5	C6	E0 (GPa)	V0
1.29 × 10^−2	0	0	0	0	0.4	0.4	0	0	1.0

A₀, A₁, and A₂ are yield function constants; PC is the truncation pressure of tensile failure; EPS1∼EPS10 are the characteristic bulk strains; P₁∼P₁₀ are the pressures corresponding to characteristic bulk strains.