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

Table 6

State equation parameters of stemming materials [28].

Density (kg/m^3)	Shear modulus (GPa)	Bulk modulus (GPa)	A0	A1	A2	PC	EPS1	EPS2	EPS3	EPS4	EPS5	EPS6	EPS7	EPS8	EPS9	EPS10	P1 (GPa)	P2 (GPa)	P3 (GPa)	P4 (GPa)	P5 (GPa)	P6 (GPa)	P7 (GPa)	P8 (GPa)	P9 (GPa)	P10 (GPa)
1800	1.60E − 2	1.328	0.0033	1.31E − 7	0.1232	0.0	0.0	0.05	0.09	0.11	0.15	0.19	0.21	0.221	0.25	0.30	0.0	3.42	4.53	6.76	12.70	20.80	27.10	39.20	56.60	123.0

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.