Issue 51

G. Ramaglia et alii, Frattura ed Integrità Strutturale, 51 (2020) 288-312; DOI: 10.3221/IGF-ESIS.51.23 301 (a) (b) Figure 8 : Comparison between experimental results and Mohr-Coulomb models: a) experimental and theoretical results comparison, b) confinement curve comparison for α =-0.1 (black solid line) and α =-0.2 (black dashed line). Statistical parameter Stassi- D’Alia Drucker-Prager Henky-Von Mises Mohr-Coulomb MAPE 0.225 1.324 0.289 0.855 MSE 0.328 12.481 0.535 5.075 R 2 0.820 -1.86 0.603 -0.512 Table 2 : Statistical parameters to comparison the theoretical and the experimental results, with a confined lateral stresses, , l eff f calculated according to Eqn. (13). Statistical parameter Stassi- D’Alia Drucker-Prager Henky-Von Mises Mohr-Coulomb MAPE 0.243 1.375 0.280 0.887 MSE 0.311 13.342 0.496 5.419 R 2 0.833 -1.954 0.800 -0.563 Table 3 : Statistical parameters to comparison the theoretical and the experimental results, with a confined lateral stresses, , l eff f calculated according to Eqn. (18).