After defining the last segment of the foundation profile, the Define failure plane command can be triggered for the stability calculations. As shown in Figure 21, the failure plane can be defined manually by the user or automatically obtained using a linear regression of the foundation profile. As the base plane must be a single segment, the determination of this failure plane is critical for the stability analysis as well as the stresses at the concrete-rock interface. Particular attention must be given to this aspect of foundation modeling.

Figure 21