Plot > Strength Factors > SF-ip Strength/Stress
Plot > Strength Factors > SF/ip Stress/Strength
Plot > Strength Factors > Δτip Excess Shear Stress
Plot > Strength Factors > N(Δτip/std) Probability
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Contours the strength for in-plane shear. These components can be accessed via the Strength Factor Components toolbar as follows:
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To calculate the in-plane shear and normal stresses, the stress state at each point on the grid plane is reoriented to determine the maximum shear stress parallel to the grid plane and the stress normal to the grid plane.
In elastic analysis the maximum in-plane shear and normal stresses can be used with the Mohr-Coulomb strength criterion
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.
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
Here we assume that the stress path to failure takes place by increasing tip without loosing confinement.
Strength parameters are set up using
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