In the Field Stress dialog, you may configure advanced settings relating to the stress analysis, by selecting the Advanced button. In the Advanced Settings dialog you may define:
Rock mass Young's modulus
Rock mass Poisson's ratio
Matrix solution technique
Element type
Number of elements
Number of joint sample points
Number of intervals for contours
Apply pressures as boundary conditions
The boundary element stress analysis used in Unwedge, is based on the analysis engine used in the Rocscience program Examine2D. For more information about Examine2D, you can click the following link:
http://www.rocscience.com/products/Examine2D.asp
The Examine2D reference manual can be downloaded, which contains information on the various analysis parameters.