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Table 2 Mechanical parameters of the numerical model of the generator unit #4

From: Splitting failure in side walls of a large-scale underground cavern group: a numerical modelling and a field study

Rock mass classification Bulk density (kN/m3) Deformation modulus (GPa) Friction angle (°) Cohesion (MPa) Poisson’s ratio Tensile strength (MPa)
II 26.5 23.5 52.4 2.0 0.25 8.0
III 26.5 9.5 47.7 1.4 0.27 6.0
IV 26.5 2.5 38.7 0.7 0.35 4.0
II/III 26.5 16.5 50.2 1.7 0.26 7.0