Dear Support Team,
In PLAXIS Reference Manual, section 9.3.3 (i. e. PLAXIS 2D CE manual) we can find the hint:
Particularly when the soil strength has been defined by means of effective strength parameters (Undrained (A) it is useful to plot the mobilised shear strength τmob in a vertical cross section and to check this against a known shear strength profile.
So the results for Undrained A should be checked by comparing the mobilised strength, τmob.
On the other hand, in Tips and Tricks (https://communities.bentley.com/products/geotechnical1/w/wiki/46010/how-to-check-undrained-shear-strength-using-undrained-a) we can see the picture with circles that refer to the limit line, which means that it is the maximum strength, τmax, not τmob:
Could you please inform us which strength should be used for checking: maximum or minimum?
Best regards,Rushan Gizzatullin