Plot > Stress > τub Ubiquitous Shear Stress
Plot > Stress > σub Ubiquitous Normal Stress
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This allows you to contour the maximum shear stress These components can be accessed via the Stress Components toolbar as follows:
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
To calculate the ubiquitous stresses, the stress state at each point on the grid plane is reoriented to determine the maximum shear stress parallel to the ubiquitous plane and the stress normal to the ubiquitous plane. Note that σub is oriented normal to the ubiquitous plane and is not parallel to the direction of a line grid.
•dip direction is measured positive clockwise from the y-axis. •dip of the plane is measured positive down from the horizontal (i.e. the dip direction). •plunge of the normal is measured positive down (i.e. negative up) from the horizontal.
The orientation of the ubiquitous shear plane is set using
In elastic analysis the maximum ubiquitous-plane shear stress is normally used with the ubiquitous-plane normal stress and the Mohr-Coulomb strength criterion
to estimate the amount of slip due to over-stressing, on a fault, joint set or bedding plane at the specified orientation. Since these parameters are orientation dependant, this criterion is representative for anisotropic 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
Backfill-Hyperbolic in DD planes.
Over-stressing can be presented in several forms including:
The contour range is set using
This component can be added to the contour toolbar if desired
The user may find it handy to add the
button to the contouring toolbar for quick access to all stress components.
Related topics:
The orientation of the ubiquitous-plane is specified in
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button on the 
