[GeoMechanicsApplication] The excavation example with Mohr-Coulomb

[indigocoral]

All related info for this issue is in the parent issue.

The Kratos model can be found here:
https://github.com/KratosMultiphysics/Kratos/tree/geo/add-submerged-construction-of-excavation-case/applications/GeoMechanicsApplication/tests/submerged_construction_of_excavation

The built-in Mohr-Coulomb Plaxis model can be found here:

Submerged construction of an excavation MOHR COULOMB.p2dxdat.zip

[indigocoral]

Refinement 21/10/2025

The creation of the model for both Kratos and Plaxis is done by 21/10/2025. From now on, it will be more of an investigation of the calculation that we are seeing when running Kratos Mohr-Coulomb and then finally comparing the results.

Current status:
Stages 1 and 2 seem to run without problems: with and without the load stepping scheme.
Stage 3 converges without the load stepping scheme (consistently—not so fast). For the load stepping scheme, interfaces and the Timoshenko beam are new (It is being worked on, but still does not work.)
Stage 4 without the load stepping scheme doesn't converge.

To do:

Complete the load stepping scheme for the following (as a prototype):

• Interface elements
• Timoshenko beam
• Truss elements.

These changes will be done in another branch since they will be a prototype.

(Estimated time for this prototype: 7 days)