For non-linear soil simulations the excavation volume and soil structure may need to be extended for proper simulation. The SOILMESH command will used extend the excavation cavity for Soil Pressure can be to extend the excavation. This model can then be merged with the original model to provide the extended structural elements for the model. These user must then WELD the 2 models together before creating the excavation volume for the extended structure.

ACTM,1 *Set Place for the Original Model 
INP,OrginalModel.pre *Create Soil Mesh in model 2
SOILMESH,... *Create Soil Mesh to model 2
* Get Soil mesh and load on top of the original model
ACTM,2
WRITE,SoilMesh.pre 
ACTM,1
INP,SoilMesh.pre
WELD
EXCAV,3 * create new excavation volume
ACTM,4
MERGESOIL,1,3 * Megre the model

Notes: All interaction nodes and boundary conditions should be (checked/reapplied) after the models have been merged.