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 ${c_j}/{\tan \phi_j}$.