Thanks again Stefane, it sounds a bit complicated, because the embedded-beam nodes (which I believe are created at the intersection with the solid soil elements), do not coincide with the solid-element nodes. It would be appreciated if this was picked…

Dear Zhilong Liu , There are some possible reasons, why PLAXIS gives local failure mechanism. Firstly , we should check soil parameters and phase sequence. Secondly , we should eliminate the impact of mesh. On screenshot I can see relatively fine mesh…