GeoStudio | PLAXIS - Free field boundaries without compliant base bottom may turn into viscous boundaries

Application	PLAXIS 2D
Issue status	✔ Solved
First Affected Version	PLAXIS 2D AE.00
Found in Version	PLAXIS 2D AE.00
Fixed and Released in Version	PLAXIS 2D AE.02
Issue #	21525
Date created	11 June 2014
Date modified	24 October 2016

Problem description

PLAXIS 2D AE.00 and PLAXIS 2D AE.01: When applying free field boundaries at the vertical model boundaries with a fixed base (Dynamic bottom boundary set to None) and an interface at the bottom of the model, the free field boundaries will change into viscous boundaries during the calculation.

The conditions for free field boundaries to wrongly change into viscous boundaries are:

the dynamic model condition for the bottom boundary (base / ymin) is set to None;
and an interface (active or inactive) is present along this fixed base;

Note there is no problem with compliant base boundaries if an interface is defined at the base and the dynamic boundary condition for the base is set to compliant base.

Solution

This issue is now solved in PLAXIS 2D AE.02