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Sensitivity Analysis
In Slide, sensitivity analysis allows the user to determine
the "sensitivity" of the safety factor to variation in the input data
variables. This is done by varying one variable at a time, while keeping
all other variables constant, and plotting a graph of safety factor
versus the variable.
Pick sensitivity analysis in the project settings.
Define the range to vary the parameter over. In this case
vary the horizontal seismic coefficient between 0 and 0.2.
Run the analysis and plot the distribution of factor of
safety with respect to the variable (in this case seismic coefficient).
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Sensitivity Analysis: Multiple Variables
The user can also generate plots with multiple parameters to determine which has the most influence on the factor of safety. In this case, the horizontal axis will be in terms of Percent Change. The Percent Change is the relative difference between the Minimum value of a variable (0 %) and the Maximum value of a variable (100 %).
Pick the variables to plot.
Sensitivity plot of multiple variables.
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Sensitivity Analysis: Determine
Parameter Value For Defined Factor of Safety
The Sampler option allows you to obtain exact values of points on
the sensitivity curves. This can be done graphically or by entering
the desired value in a dialog. This allows you to determine an exact
parameter value which gives a specified factor of safety (eg. FS =
1.0) or the factor of safety which corresponds to a specified parameter
value.
Sensitivity graph with the sampler (the horizontal dotted
line). A cohesion value of 33.69KPa will yield a factor of safety
equal to 1.0.
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