Plot > Strength Factors > Ubiquitous Parameters
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Sets up the strength parameters for generating strength factor contour plots in terms of ubiquitous-plane stress components. 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.
Selecting the
To calculate the ubiquitous 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 ubiquitous shear plane and the stress normal to the ubiquitous shear plane.
In elastic analysis the maximum ubiquitous-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 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
Cohesion and Friction Angle the Mohr-Coulomb criterion defines strength in terms of principal stresses as follows:
Tension cutoff, UCS and Cohesion are specified in units of stress (MPa or psi). Friction angle is specified in degrees.
Standard Deviation specifies the uncertainty you have in the failure criterion measured in the τip direction (specified in units of stress, MPa or psi). Dip of plane – specifies the dip of the ubiquitous plane (in degrees). The dip of the normal is automatically adjusted to reflect changes in this value.
Dip Direction – specifies the dip direction of the ubiquitous plane (in degrees).
Dip of Normal – specifies the dip of the normal to the ubiquitous plane (in degrees). The dip of plane is automatically adjusted to reflect changes in this value.
Grid Normal – sets the ubiquitous plane parallel to the currently selected grid plane. In this case all in-plane results will be identical to the ubiquitous plane results.
Acc Dam – plots accumulated damage. Refer to Accumulated Damage
Plot UB DIsks – toggles display of planar contour plot or disks representing the orientation of the UB plane.
Scaled Size – scales the size of the UB disk to the magnitude.
UB DIsk Radius – specifies the radius of the UB disks.
Apply – regenerates the contour plot.
UB#2 & UB#3 – activates strength parameters for ubiquitous plane #2 and/or #3. When checked, the minimum for all active ubiquitous planes is presented for all strength parameters (
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