Question
What are the input parameters used in the Jointed Rock Mass model? How does it differ in the case of 2D/3D modeling?
Answer
Following is a snip showing the input parameters used in the Jointed Rock Mass model:
Following is the explanation for the input parameters used in the Jointed Rock Mass model:
The Elastic Modulus, Poisson's Ratio, and Shear Modulus are input based on a similar explanation about Transversely Isotropic materials, as shown in the following picture:
Maximum number of three Joint sets can be defined.
For each Joint set: Cohesion, Friction Angle, Alpha1 and Alpha2 are to be input.
For use in 3D:
Declination in 3D models is used to specify North in the numerical model with respect to the Global X axis.
Alpha 2 defines Strike direction with respect to the defined North in the model.
Alpha 1 is the value of the Joint Dip Angle.
For use in 2D:
Declination is not used, hence, it is to be entered as zero in 2D analysis.
Alpha 2 should also be entered as zero.
Alpha 1 is the value of the Joint Dip angle from the horizontal (X axis).
The input Dilatancy Angle and Tensile Strength data for the joint sets is optional. For additional details on the input parameters, kindly refer to the online help manual.
If the engineer is interested in checking results using Mohr Coulomb Failure criteria, the Intact Parameter can be used.