*SOFT ROCK PLASTICITY

Optional parameters

DEPENDENCIES: Set this parameter equal to the number of field variable dependencies, in addition to temperature, included in the definition of the soft rock parameters. If this parameter is omitted, the soft rock parameters may depend only on temperature. See Material Data Definition for more information.
ECCENTRICITY: This parameter is used to define the eccentricity, $ϵ$ . The default value of $ϵ$ is 0.001.

Data lines to define soft rock plasticity

First line

Friction angle, $β$ , in the p–t plane. Give the value in degrees. The friction angle can range from $0^{\circ} \leq β \leq {89.9}^{\circ}$ .
Dilation angle, $ψ$ , in the p–t plane. Give the value in degrees. The dilation angle can range from $0^{\circ} \leq ψ \leq {89.9}^{\circ}$ .
Material parameter, $n_{y}$ . If this value is left blank or set to zero, a value of 1.6 is assumed.
Deviatoric plane correction parameter, $f_{0}$ . This value must be greater than or equal to zero.
Deviatoric plane correction parameter, $f_{1}$ . This value must be greater than or equal to zero.
Deviatoric plane correction parameter, $α$ . This value must be greater than or equal to zero.
Absolute value of the initial compressive volumetric plastic strain, ${ε_{vol}^{p l} |}_{0}$ .
Temperature.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than zero)

First field variable.
Second field variable.
Third field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the dependence of the soft rock parameters on temperature and other predefined field variables.