How can I include the effect of in-situ stress (clamping stress) on the wedge safety factor?

The default Unwedge analysis is based upon the assumption that the wedges are subjected to gravitational loading only (i.e. self-weight of the wedges). The actual stress field in the rock mass surrounding the excavation is not taken into account. The Field Stress option in Unwedge allows you to include the effect of in-situ stress (clamping stress) on the wedge safety factor.

Field Stress Tutorial (click to view PDF file of tutorial)

Topics Covered in this Tutorial include:

  • Stress analysis overview

  • Defining field stress

  • Safety factor with field stress

  • Viewing stress contours

  • Stress contour data tips

  • Advanced stress options

Normal stress contours computed on wedge planes