We have compared stability analysis methods using SLOPE/W for a block failure geometry in a large rock slope. The problem is a tall slope at roughly 45 degrees which is backed by a fault zone which dips steeper than the slope, and various hypothetical inclined slip surfaces exiting the slope through a broad zone of weaker material that intersects the fault and is also exposed on the slope. The mode of failure is therefore down the fault and out toward the slope through the weak material. What we have found is that Janbu consistently results in lower FOS than Morgenstern-Price or Spencer even if the geology, failure geometry and material properties are identical.
Is there a theoretical basis for this or is the answer found in some nuance of the application?
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