Drag Load variation along the pile and how to stimulate this on Plaxis 2D

Question

Hi all, 
 
 Dotted line shows the capacity if there is no any NSF

My question is how to stimulate these things in Plaxis 2D and if any ways to find the neutral plane through analysis? 
 
 Thanks.

Dennis Waterman · Answer

Dear Nitharshan, 
 Soil stresses on a pile are caused by the difference in displacement between the soil and the pile. If the soil and the pile would have exactly the same displacement, there would be no additional force on the pile as the soil and the pile move together as one single block. I'm not sure what is further to explain on this, it's just how it works and PLAXIS takes that into account. 
 With kind regards, 
 Dennis Waterman