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Output Parameters
In addition to the basic strength criterion parameters, various other parameters are computed by RocData (e.g. tensile strength, uniaxial compressive strength), according to the current strength criterion. The calculated output parameters are displayed in the Sidebar and on the failure envelope plots. The output parameters for each strength criterion are summarized below.
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Output Parameters: Generalized Hoek-Brown
For a given set of input parameters (sigci, GSI, mi and D), RocData calculates the parameters of the Generalized Hoek-Brown failure criterion (mb, s and a), using the equations given in the Generalized Hoek-Brown topic. Results are displayed in the Sidebar as shown below.
Hoek-Brown input and output parameters
The following rock mass parameters are calculated for the Generalized Hoek-Brown criterion:
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Sigt (rock mass tensile strength)
Sigc (uniaxial rock mass compressive strength)
Sigcm (global rock mass compressive strength)
Em (rock mass modulus of deformation)
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NOTE: rock mass modulus is calculated according to the Modulus Estimation Method selected in Project Settings. See the Rock Mass Modulus topic for details.
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Output Parameters: Mohr-Coulomb
For a given set of input parameters (c and phi), RocData calculates the uniaxial compressive strength sigc. On the triaxial failure envelope, sigc is the value of sigma1 when sigma3 = 0.
RocData also calculates the Alpha angle based on the Mohr-Coulomb friction angle. The Alpha angle is the angle between the sigma1 direction and the normal to the plane of failure, and is given by the following expression:
where phi is the Mohr-Coulomb friction angle. For a frictionless material (phi=0) alpha = 45 degrees.
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Output Parameters: Power Curve
For a given set of input parameters (a, b and d), RocData calculates the parameters of the non-dimensional version of the Power Curve criterion (A, T and n), using the user-defined value of the normalizing constant Pa.
RocData also calculates the uniaxial compressive strength sigc, and the tensile strength sigt for the Power Curve envelope. On the triaxial failure envelope:
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sigc is the value of sigma1 when sigma3 = 0
sigt is the value of sigma3 when sigma1 = 0
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Output Parameters: Barton-Bandis
For the Barton-Bandis criterion, the only parameters involved are the basic strength criterion parameters - phi(residual), JRC and JCS. No additional parameters (e.g. tensile strength, uniaxial compressive strength) are computed from the failure envelope, as these parameters are not applicable for the Barton-Bandis criterion.
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