My question maybe is some basic but very important. In FLAC Manual (Factor of Safety) is the following text:
“The detection of the boundary between physical stability and instability is based on an objective
criterion in FLAC that decides whether the system is in equilibrium or a state of continuing motion.”
Can you say me please which are these criterion if I used ofr example Solve FoS?
In the practice, I put histories of displacement, velocity, unbalanced forces, etc… and run the model. Then I see if the histories with the plasticity indicators if the model have instability or not (using Strength Reduction Method “manually” in FLAC). I know too that exists some velocities to define more or least instability or stabilty (could be 1e-5 or 1e-6 in FLAC/FLAC3D, obviously verifing with some histories previously). But which is the internal criterion in FLAC to define stabilty or instabilty? Are these criterion used in FLACSLOPE for example? Thanks in advance.