Problem in UBC3D-PLM model.

Question

For the same model Mohr-Coulomb, HS and Hs small model is giving positive pore water pressure but the UBC3D-PLM model is giving negative results of excess pore water pressure. Is there any problem in software or I am doing something wrong.

Stefanos Papavasileiou · Accepted Answer

Dear Rahul, 
 It is very difficult to comment on your question without knowing anything about what you modelling and how you do it. 
 Did you try with a simple model in a way that you can get a simple result, e.g. undrained response? 
 Note that the UBC3D-PLM is a constitutive model which is capable of simulating the liquefaction behaviour of sands and silty sands under seismic loading, and those capabilities are not included in the other models you mentioned. 
 In order to be able to assist you with your project and identify the reason for the problem you experience, please submit a service request. Then, one of our support engineers can help you in detail: https://apps.bentley.com/srmanager/ProductSupport