ID_PLOT_STRESS_S1MS3   Plot > Stress > τmax   Maximum Shear Stress

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This allows you to principal stress components τmax=½(σ1 - σ3).

This component can be accessed via the Stress Components toolbar as follows:

 

clip0288

 

This toolbar can be changed to a vertical orientation by dragging is against either the right or left hand edge of the main window.

It can be changed back to a horizontal orientation by dragging is against either the top or bottom edge of the main window.

 

Selecting the clip0290 button on the Contours toolbar activates the Stress Components toolbar.

 

clip0291

 

In elastic analysis, the maximum shear stress is normally used with the minor principal stress and the Mohr-Coulomb or Hoek-Brown strength criterion

 

ID_PLOT_MODIFY_FC Plot > Strength Factors > Strength Parameters

 

to estimate the amount of damage due to over-stressing. Since none of the parameters have any orientation sensitivity, this criterion is representative for homogeneous rock mass stability.

 

 

By contrast, in non-linear analysis the stresses can never exceed the strength unless some creep is used. In this latter case, viscous creep can allow stress states above the failure criterion, thus indicating a lack of static equilibrium. Hence for non-linear analysis one normally directly considers the amount of non-linear strain or the strain rate predicted by the model

 

Mohr-Coulomb in 3D FF blocks.

 

Over-stressing can be presented in several forms including:

 

ID_PLOT_FC_A ID_PLOT_FC_A_INV Plot > Strength Factor > SF-A   Strength/Stress

ID_PLOT_FC_B ID_PLOT_FC_B_INV Plot > Strength Factor > SF-B   Strength/Stress

ID_PLOT_FC_C ID_PLOT_FC_C_INV Plot > Strength Factors > SF-C   Strength/Stress

ID_PLOT_EXCESS_S1 Plot > Strength Factors > dS1   Excess Stress

ID_PLOT_EXCESS_SMAX Plot > Strength Factors > dTmax   Excess Stress

 

The contour range is set using

 

ID_RANGE Plot > Range

 

Any of these components can be added to the contouring toolbar if desired

 

ID_VIEW_BAR_OPTIONS Tools > Configure Contouring Toolbar > Stress

 

The user may find it handy to add the

 

ID_PLOT_STRESS_SPECIAL More Stress Components

 

button to the contouring toolbar for quick access to all stress components.