The prediction of the necessary support pressure at the tunnel face is a prerequisite for safe machine driven construction of tunnels. Among other methods, the finite element method (FEM) employing the Strength Reduction Technique (SRT) has been proven to be a powerful tool in assessing the factor of safety against collapse of the tunnel face. However, since the kinematics of standard finite elements is insufficient to predict shear failure modes we evaluate the capability of the Enhanced Assumed Strain (EAS) formulation in capturing strain localization, and compare their performance to conventional finite elements in the context of comparative 3D tunnel face stability analyses.
Investigation of Computational Approaches for the Assessment of Tunnel Face Stability
CALLARI, Carlo;
2017-01-01
Abstract
The prediction of the necessary support pressure at the tunnel face is a prerequisite for safe machine driven construction of tunnels. Among other methods, the finite element method (FEM) employing the Strength Reduction Technique (SRT) has been proven to be a powerful tool in assessing the factor of safety against collapse of the tunnel face. However, since the kinematics of standard finite elements is insufficient to predict shear failure modes we evaluate the capability of the Enhanced Assumed Strain (EAS) formulation in capturing strain localization, and compare their performance to conventional finite elements in the context of comparative 3D tunnel face stability analyses.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
