Setting frictional parameters
With the Set Frictional Parameters form (Model > Fault Stability > Set Frictional Parameters) you enter the values for the fault friction coefficient and fault cohesion on a fault by fault basis, required to apply the Mohr-Coulomb failure criterion calculations later in the workflow.
A fault plane cohesion of 0 and a friction coefficient of 0.6 are used as the default values for the most common rock types when you open the form. With clay material in the fault plane ('clay smear'), typical for faults offsetting sand/shale sequences, the fault yields a lower strength and a lower friction coefficient is expected. Cemented faults typically show an increased fault cohesion.
To set frictional parameters
- Open the Set Frictional Parameters form and under Model, select the fault stability model for which you want to set the frictional parameters.
- In the Frictional Parameters table, all faults assigned to the selected model show up. By default, the fault friction coefficient is set to 0.6 and the fault cohesion is set to 0. Enter different values if applicable.
- Click Apply or OK at the base of the form to assign the values and create the fault cohesion and fault friction coefficient properties for each of the faults. The properties are stored in a newly generated folder called 'Frictional Properties', located under your fault stability model in the JewelExplorer.
To enter the same value for all faults in one go, right-mouse click in a cell in the table and select Set fault friction coefficient globally or Set fault cohesion globally. On the 'Set Global Value' dialog that opens, enter the value and click OK.