*Examine3D* can be used for near surface excavations. However to ensure the proper modeling and analysis of results, the following should be kept in mind:

1. The extent of the surface is extremely important. Models done by both customers and Rocscience indicate that the extent of the surface should range between 10 and 50 typical diameters. A typical diameter would be the maximum dimension of a box placed around your zone of interest. The best way to ensure you have gone out far enough is to vary the extents of the surface until there is no practical change in the results.

2. Non-horizontal ground surfaces must be analyzed with a two step process if you ar interested in displacements. The first step is modeling of just the ground surface. The second step is modeling the excavations with the ground surface. To see the displacements due to the excavation only, you must then use the dstress utility to subtract the displacements from the first step. This process is necessary for non-horizontal ground surfaces because there are displacements in the first step due to elastic rebound or settlement (depending on where the defined ground surface elevation for initial gravitational stresses is with reference to the ground surface boundary elements), and you generally want to factor these displacements out of the analysis. If you are just interested in stresses, this process is not necessary.

3. *Examine3D* has a isotropic single material, elastic material model. All the assumptions which go with this statement apply.