We have a number of nonlinear material modeling options for geomechanic applications of soils, rock and aggregate materials. Refer to MAPDL online help Section 4.9 (Geomechanics) for more details. There is also a simple example illustrating active/passive earth-pressure analysis in Section 48.6 of our Technology Demonstration Guide which might be a good place to start. I am not aware of a worked out simulation for the specific "soil nailed wall" scenario. We do support the inclusion of both smeared and discrete reinforcement, which might be useful here.
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