6.5.6 Failure Surface
Once unstable or steady plastic flow has been identified, the location of failure surface can be judged by plasticity indicators, displacement field and localization of shear strain. The extent of the zone of actively yielding elements forms the outer limit where failure surface can develop. By looking at the displacement pattern in the model, a more precise estimate can be made (figure 20).
Figure 20: shear strain rate in slope after simulation by finite