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Tunnel Excavation

Application 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.

This model is included as an example in the following products:

Geomechanics Module

The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.