Determination of Constitutive Parameters of Crystalline Limestone Based on Improved RHT Model

Table 3

Values of RHT constitutive parameters.

Parameter symbols	Parameter description	Value	Parameter symbols	Parameter description	Value
	Density (g·cm^−3)	2.68		Failure surface index	0.714
	Pressure in gap compression (GPa)	0.0147		Shear modulus	17.46
	Pressure in gap compression (GPa)	6		Pull pressure meridian ratio	0.6805
	Failure surface parameters	2.47		Compression strain rate index	0.0262
	Rankine-Hugoniot coefficient (GPa)	48.06		Tensile strain rate index	0.0311
	Rankine-Hugoniot coefficient (GPa)	43.26		Reference compressive strain rate (ms^−1)	3 × 10^−8
	Rankine-Hugoniot coefficient (GPa)	4.44		Reference tensile strain rate (ms^−1)	3 × 10^−8
	Lode angle-related parameters	0.0105		Failure compression strain rate	3 × 10^22
	Equation of state parameters	0.9		Failure tensile strain rate	3 × 10^22
	Equation of state parameters	0.9		Minimum residual strain of damage	0.01
	Equation of state parameters (GPa)	48.06		Initial damage parameters	0.04
	Equation of state parameters (GPa)	0		Damage parameters	1
	Porosity index	3		Shear modulus reduction factor	0.5
	Initial porosity	1.1884		Compression yield surface parameters	0.88
	Uniaxial compressive strength (GPa)	0.0442		Tensile yield surface parameters	0.72
	Relative tensile strength	0.12		Residual stress strength parameters	1.62
	Relative shear strength	0.40		Residual stress strength index	0.6