@dgillette
Thank you for your comments. I now have a much better understanding of the field vane shear test. I was basing most of my assumptions on the vane shear text from Spangler and Handy's "Soil Engineering". I now understand that even though the vane shear test results are "sometimes...
@KVgeo
I appreciate your input. Perhaps a little more clarification will help.
In regards to my 1st question, I don't feel that I lack a general understanding of drained and undrained shear, but I more lack experience with the interpretation of the field vane shear test results, more...
As part of a slope stability analysis, we performed field vane shear tests on lean clay soils (PI between 10 and 22) using a Geonor H-70. The vane shear testing was performed as a supplement to previous testing performed on Shelby tube samples which yielded lower than expected results, possibly...