I am trying to run coupled flow-deformation analysis for slope subjected to rainfall infiltration with multiple time duration (i.e 1h, 3h, 6h, 12h, 24h & 36h).
For initial steps, I put maximum number of steps as 10000 to complete analysis, but after completing 3 stages, it gives me error that "Prescribed Ultimate time not reached". When I try to increase number of steps more than 10000, software doesn't allow me to do this.
Is there any Solution for this????
Dear Sohaib,
Without knowing more about the calculation, the error you experience is probably related to soil failure (from Reference manual appendix), as this is not about not having enough load steps. In order to find out what the mechanism for failure is, and so possibly determining the cause, these Output plots should be inspected:
A combination of these plots will usually give insight into what is happening.
I really like the incremental deviatoric stress plot for finding convergence issue. I usually have to rescale the min and max range so you can see where all the action is. I usually set the minimum to 0, and incremental reduce the max, usually have to reduce it by a lot, but this really shows where the solver is spending a lot of concentrated effort to try reach equilibrium.
Martin
Dear Martin,
Thanks for the recommendation with zero.
In some cases, translating the legend into a logarithmic formulation helps us. Danger zones become more distinct. It also helps in safety calculations.
For example, Soil body seems to collapse:
Automatic scaling ↑
Logarithmic scaling ↑
Another phase:
Hi Martin, I am also struggling in identify the failure mechanisms of my models. I am using incremental shear strain to define the failure mechanisms by rescaling from zero to maximum, but it varies for each model. How can I adjust the reliable or proper scale for my models.
THANKS