Study on Optimization of Delay Method of Wedge Cut Blasting in Tunnel

Table 3

Limestone HJC model parameters.

Parameter	Value	Parameter	Value
Mass density (kg/m^3)	2 300	Crushing pressure (MPa)	20
Shear modulus (MPa)	10 093	Fracture volume strain	0.00125
Standardized bond strength	0.55	Locking pressure (GPa)	2
Normalized pressure hardening	1.23	Locked volume strain	0.174
Strain rate factor	0.009 7	Damage constant D1	0.04
Pressure hardening index	0.89	Damage constant D2	1
Quasistatic uniaxial compressive strength (MPa)	60	Pressure constant K1 (GPa)	39
Maximum stretching hydrostatic pressure (MPa)	4	Pressure constant K2 (GPa)	−223
Plastic strain before fracture (MPa)	0.01	Pressure constant K3 (GPa)	550