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 to the model. These user must then WELD the 2 models together before creating the excavation volume for the extended structure.

MDL,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
MDL,2
WRITE,SoilMesh.pre 
MDL,1
INP,SoilMesh.pre
WELD
EXCAV,3 * create new excavation volume
MDL,4
MERGESOIL,1,3 * Megre the model

Notes: MERGE command could be used to combine the models but Merge will offset the nodes of SOILMESH model which has already has been offset from the original model. All interaction nodes and boundary conditions should be (checked/reapplied) after the models have been merged.