ubiquitous-joint

bulk f

elastic bulk modulus, \(K\)

cohesion f

cohesion, \(c\)

dilation f

dilation angle, \(\psi\). The default is 0.0.

dip f

dip angle [degrees] of weakness plane

dip-direction f

dip direction [degrees] of weakness plane

friction f

internal angle of friction, \(\phi\)

poisson f

Poisson’s ratio, \(\nu\)

shear f

elastic shear modulus, \(G\)

tension f

tension limit, \({\sigma}^t\). The default is 0.0.

young f

Young’s modulus, \(E\)

joint-cohesion f

joint cohesion, \(c_j\)

joint-dilation f

joint dilation angle, \({\psi}_j\). The default is 0.0.

joint-friction f

joint friction angle, \({\phi}_j\)

joint-tension f

joint tension limit, \({\sigma}^t_j\). The default is 0.0.

normal v

normal direction of the weakness plane, (\(n_x\), \(n_y\), \(n_z\))

normal-x f

x-component of the normal direction to the weakness plane, \(n_x\)

normal-y f

y-component of the normal direction to the weakness plane, \(n_y\)

normal-z f

z-component of the normal direction to the weakness plane, \(n_z\)

flag-brittle b

[advanced] If true, the tension limit is set to 0 in the event of tensile failure. The default is false.

Notes:

• Only one of the two options is required to define the elasticity: bulk modulus \(K\) and shear modulus \(G\), or, Young’s modulus \(E\) and Poisson’s ratio \(\nu\). When choosing the latter, Young’s modulus \(E\) must be assigned in advance of Poisson’s ratio \(\nu\).
• Only one of the three options is required to define the orientation of the weakness plane: dip and dip-direction; a norm vector (\(n_x, n_y, n_z\)); or, three norm components: \(n_x\), \(n_y\), and \(n_z\).
• The tension cut-off is \({\sigma}^t = min({\sigma}^t, c/\tan \phi)\).
• The joint tension limit used in the model is the minimum of the input \(\sigma^t\) and \({c_j}/{\tan \phi_j}\).

Footnote

Advanced properties have default values and do not require specification for simpler applications of the model.