Plot > Strength Factors > SF-A Strength/Stress
Plot > Strength Factors > SF/A Stress/Strength
Plot > Strength Factors > Δσ1 Excess Stress
Plot > Strength Factors > N(Δσ1 /std) Probability
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Contours the excess major principal stress and strength factor using method "A". These components can be accessed via the Strength Factor 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.
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In elastic analysis the major and minor principal stresses can be used with the Mohr-Coulomb or Hoek-Brown strength criteria
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
Method "A" assumes that the stress path to failure takes place by increasing σ1 without loss of confinement. This is representative of a pillar failure where σ1 is considered to be the driving force.
the same as in method "B".
the same as in method "B".
Drucker-Prager is only defined using method "C".
Strength parameters are setup using
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