Table 4 Physical parameters of rock mass model (RHT).

Mass density ρ₀ (g/cm³)

2.62

Elastic shear modulus G (GPa)

21.19

Compressive strength f_c (MPa)

158.36

Compressive strain rate exponent βc

0.032

Initial porosity α₀

1.0

Tensile strain rate exponent β_t

0.036

Polynomial coefficient A₁ (GPa)

35.27

Reference compressive strain rate ε̇₀^c (s⁻¹)

3.0 × 10⁻⁵

Polynomial coefficient A₂ (GPa)

39.58

Reference tensile strain rate ε̇₀^t (s⁻¹)

3.0 × 10⁻⁶

Polynomial coefficient A₃ (GPa)

9.04

Break compressive strain rate ε̇^c (s⁻¹)

3.0 × 10²⁵

Parameter for polynomial EOS B₀

1.22

Break tensile strain rate ε̇^t (s⁻¹)

3.0 × 10²⁵

Parameter for polynomial EOS B₁

1.22

Damage parameter D₂

1

Parameter for polynomial EOS T₁ (GPa)

25.7

Porosity exponent N_p

3

Parameter for polynomial EOS T₂ (GPa)

0

Failure surface Parameter N

0.76

Compaction pressure P_comp (GPa)

6.0

Relative tensile strength f_t*

0.1

Relative shear strength f_s*

0.18

Failure surface Parameter A

2.44

Lode angle dependence factor Q₀

0.68

Lode angle dependence factor B

0.0105

Damage parameter D₁

0.04

Shear modulus reduction factor ξ

0.50

Lode angle dependence factor ε_p^m

0.01

Residual surface parameter A_f

1.62

Residual surface parameter N_f

0.61

Crush pressure P_el (MPa)

105.5

Compressive yield surface parameter g_c*

0.53

Tensile yield surface parameter g_t*

0.70