PLAXIS 3D Tunnel crossing with volume elements

Hi all,

First question here :) For a project I'm working on I am modelling a set of access tunnels used to allow construction of an underground structure (in PLX 3D 22.02). Starting out from an initial 2D project which works well I tried extending the geometry to 3D using the built-in converter.

2D situation

Unfortunately, at the crossing of the tunnel and the two supporting walls there is a narrow triangular overlap which cannot be meshed with any level of refinement I've tried so far.

2D-3D conversion

As an alternative I've tried manually re-drawing the geometry and intersecting/reclustering/snapping shapes to avoid the overlap altogether. This has not resolved the meshing issue.

Manual re-draw

Are there any known issues with intersecting volumes generated by the tunnel designer and regular volumes? Do you have any advice on how to proceed with this?

Kind regards,