Gneiss Rock parameters

Value

Density

2.7

Young’s modulus E (GPa)

E₁ = 12.5; E₂ = 12; E₃ = 12.5

Poisson’s ratio ν

ν₁ = 0.35; ν₂ = 0.24; ν₃ = 0.3

Shear modulus G (GPa)

G₁ = 4.6; G₂ = 4.75; G₃ = 4.86

Tensile strength is σ_t (MPa)

10.9

Mode 1 fracture toughness (MPa.mm^1/2)

0.3