Plot > Stress > εsi In-Plane Shear Strain
Plot > Stress > εni In-Plane Normal Strain
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Contours the maximum shear strain acting on the grid plane, and the strain component normal to the grid plane or parallel to a line grid. These components can be accessed via the Strain 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 You can add this button to the Contours toolbar using the configuration
To calculate the in-plane strains, the strain state at each point on the grid plane is reoriented to determine the maximum shear strain parallel to the grid plane and the strain normal to the plane. Note that εip is oriented normal to the grid plane and 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.
In elastic analysis the maximum in-plane shear stress is normally used with the in-plane normal stress and the Mohr-Coulomb strength criterion
to estimate the amount of damage due to over-stressing. 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
to estimate the amount of slip due to over-stressing, on a fault, joint set or bedding plane oriented in the same way as the grid plane. Since these parameters are orientation dependant, this criterion is representative for anisotropic rock mass stability.
Note that there are three components of strain that can be contoured:
There are also two different ways of presenting the strain:
The contour range is set using
Any of these components can be added to the contouring toolbar if desired
The user may find it handy to add the
button to the contouring toolbar for quick access to all strain components.
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