Shallow tunnel face stability analysis using finite elements

Purpose. This work aims to study the tunnel face stability (Algiers subway Tunnel) and evaluate common numerical procedures that are used for analyzing stability. Two-dimensional (2D) three-dimensional (3D) Finite Element (FE) modeling using PLAXIS programs. Methodology. Tunneling is executed by NATM method; two types of calculations used. The first one done reducing applied pressure until collapsed. second calculation method involves Phi-c (the angle internal friction bonding) reduction method, which based on calculating safety factor shear strength soil. Both methods 2D 3D FE-modelling. Findings. It found determining an important consideration avoid failure or excessive deformations with resulting in more precise findings than analytical methods. Originality. originality this use both modelling, combined approaches: structural analysis plastic state Practical value. illustrates much better method. Moreover, result FE-modelling gives a prediction comparing results.