Application | PLAXIS 2D PLAXIS 3D |
Version | PLAXIS 2D 2017 PLAXIS 3D 2017 |
Date created | 05 July 2017 |
Date modified | 17 February 2022 |
For the case of semi-permeable interfaces, the output program shows the resulting specific groundwater flow through the interface elements (qn for 2D and 3D).
These output results and their plots are not available in the case of fully impermeable or fully permeable interface elements.
Specifically, in the case of fully permeable interface elements, the pore pressure degrees of freedom are fully coupled in the calculation kernel. Since the nodes of the interfaces are fully coupled there is no difference in head and as a result, Darcy's law is not applied and the specific groundwater flow cannot be calculated.
A workaround for this specific case is to specify a very low value for the hydraulic resistance (d/k) for the interface cross permeability.