Hello William, Great catch. Indeed, most of the times the boundary and soil conditions are to be blamed for incorrect results. A tip is to always check the Preview of the phase before calculation to ensure that the steady-state pore water pressures…

Dear William, In general, whether to use the Interpolate or a specific Head value depends mostly on the soil permeabilities and how the soil is expected to react to the lowering of the water level in Layer 2. Therefore, the information on the project…

Dear William, The problem you experienced can happen due to a small inaccuracy of the created geometry (usually from import). Most of the times this inaccuracy is too small to be noticed while checking the model, however, the program will indicate…

Dear William , As far as I know, there is no limitations of nodes. PLAXIS has inner settings that controlling finite element (tetrahedron) configuration. In some cases if you use smaller elements (Medium), the mesher could give meshing error. Anyway…

Dear Rushan, Thank you for your big help! I found the way out! It really depends on the boundary of the imported DXF surface. I imported the top soil layer by "structure" and buildup solid/volume, and "connect" to another soil layer, it works and…

Dear William , Great! I am very glad, that your issue has been resolved. You are welcome ;)

Dear William, As you can see, not whole boundary has fixities, only some parts: It means, that all geometry that have green arrows on this error boundary has the different x-coordinates in comparison to the x-coordinate of boundary. Please, check…

Dear William , As you can see, some geometry on the xmin boundary is out of contour: Green arrows (fixed geometry) means, that plate geometry and the geometry between plates are out of of xmin coordinate. Please, check x-coordinate of plate elements…