Define Material Statistics
In order to define Material Properties as Random Variables:
- Select Statistics > Define Material Statistics
- This will display the Joint Material Statistics dialog.
The Joint Material Statistics dialog can also be accessed through the Define Materials dialog by selecting the Statistics button.
- Choose the Material Property that you wish to define with Random Variable(s) form the listed Joint Properties
- For the selected Material Property:
- Click the Add button to add random variables.
- Select the row(s) and click Delete button to delete random variables.
- In the Add Random Variables dialog:
- Select any parameters that you wish to set as a Random Variable
- Select the Distribution (e.g., Normal, Uniform, Triangular, Beta, Exponential, Lognormal, Gamma) for the selected Random Variables.
- Click OK to add them to the selected Material Property.
- The Distribution and Mean values can be modified for any Property.
- To finish defining the Random Variable(s), set the Std. Dev. (if applicable) and Rel. Min. and/or Rel. Max. to non-zero values for all Properties.
Rel. Min. and Rel. Max. are relative to the Mean and are not the absolute range values. The absolute range is (Mean - Rel. Min.) to (Mean + Rel. Max.)
- Click OK to save the changes.
Random Variable Properties
The following parameters can be modeled as random variables:
- Unit Weight
- Ru Value (if Groundwater Method = Ru Coefficient)