ubiquitous-anisotropic

dip f

dip angle [degrees] of weakness plane

dip-direction f

dip direction [degrees] of weakness plane

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, \(n_z\)

poisson-normal f

Poisson’s ratio characterizing lateral contraction in the plane of isotropy when tension is applied normal to the plane, \({\nu}'\) = \(\nu_{13}\) = \(\nu_{23}\)

poisson-plane f

Poisson’s ratio characterizing lateral contraction in the plane of isotropy when tension is applied in the plane, \(\nu\) = \(\nu_{12}\)

shear-normal f

shear modulus for any plane normal to the plane of isotropy, \(G'\) = \(G_{13}\) = \(G_{23}\)

young-plane f

Young’s modulus in the plane of isotropy, \(E\) = \(E_1\) = \(E_2\)

young-normal f

Young’s modulus normal to the plane of isotropy, \(E'\) = \(E_3\)

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 \({c_j}/{\tan \phi_j}\).