Modeling of Tunnel Excavations In 3D FEA

This session focuses on numerical analysis of shallow tunnels in uneven terrains, which frequently cause soil-structure interaction and slope stability problems. Such complex soil-structure interaction problems can only be solved by numerical analysis, which provides complete information on the stress-strain conditions of the tunnel, the surrounding soil mass and slope. The stress state induced by construction of a shallow tunnel (secondary stress state) is three-dimensional (3D) in general. The correct simulation of the 3D load transfer, occurring ahead of and behind the tunnel face and resulting in transverse and longitudinal arching around the unsupported section at the tunnel face, is of particular importance.