Numerical Simulation of Deformation and Failure Process of Tunnel Surrounding Rock Based on Different Constitutive Models

Abstract Based on five different constitutive models, the progressive failure process of deep hard rock was simulated, and plastic zone, shear strain increment high-value horizontal displacement, maximum principal stress distribution surrounding were obtained. The calculation results show that zone calculated by MCSS HBSS models is mainly concentrated in floor vault cavern, sidewall not damaged. There no rock, magnitude displacement 10 -4 . In L-CWFS model, hysteresis cohesion friction strengthening weakened, initial angle 0. runs through whole section destroyed. order extremum -3 MC-HB model simulates spalling side wall, localization wall obvious, band formed inside deeply. N-CWFS-TSS buckling straight plate crack. A at bottom penetrates into interior rock. obvious -2 are consistent with laboratory tests field observations, mechanism compression-shear-tensile-shear composite clarified.