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Persistence Analysis
Joint Persistence Analysis is a feature of the Swedge Probabilistic Analysis, which allows you to define statistical distributions for joint persistence (i.e. the maximum continuous joint length). For a given wedge size, randomly generated values of persistence are used as a filter to determine if a wedge can actually form.
Input dialog for Persistence analysis
If the wedge dimensions exceed the allowable persistence, then the
wedge cannot exist.
If the wedge dimensions are smaller than the allowable persistence, then
the wedge can form and a safety factor is calculated.
This process is repeated for the specified number of random trial
samples.
The Persistence Analysis can be applied to the maximum wedge size, or to a randomly generated wedge size. The random variation of wedge size simulates the random variation of the wedge location (i.e. the intersection of two joint planes may daylight anywhere on a slope face).
The Persistence Analysis option is a refinement to the Swedge Probabilistic analysis. It can be used on its own, or simultaneously with any other Probabilistic analysis options in Swedge (i.e. you can define any other input random variables, in addition to the joint persistence).
In general, by checking for allowable joint persistence in a probabilistic analysis, this can only decrease the calculated probability of failure. The Persistence Analysis option should give more realistic estimates of probability of failure for slopes where the joint planes are not continuous.
Exponential distribution of joint persistence
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