Stability test results are unfavorable, if …
- clean fractures cross the test column
- during the first loading steps.
The short video explains the standard procedures and the interpretation of the test results.
Single stability test results correctly predict slope stability, so stability at the next larger scale, in only 60 – 80 % of the cases. For a better guess, we need to combine snow profile data with the test results.
Only the process-based thinking may allow for extrapolation. Knowing the origin of the problem, e.g. the weak layer type, we may tell how it formed and where the problem is present in the terrain.