Tunnel Excavation

Model ID: 9750


This model provides an estimation of the behavior of the soil during a tunnel excavation. The surface settlement and the width of the plastic region around the tunnel are important parameters needed to predict the reinforcements to use during the excavation.

Two study steps are used. The first computes the stress state of the soil before excavating the tunnel. The second computes the elastoplastic behavior after removing the soil inside the tunnel, and uses the in situ stresses calculated from the first step. In the first step, the soil is considered elastic and in the second step, a soil plasticity feature with Drucker-Prager criterion is added. The model is solved in 2D plane strain.