i tried all boundaries in the analysis ..can any one advice me what to do....or insert some reference about boundaries in plaxis
Dear Iojain,
In your post, you do not specify what type of boundaries you are interested in or what application you are using.
Therefore, here are some links about boundaries found in our Wiki pages:
https://communities.bentley.com/products/geotech-analysis/w/plaxis-soilvision-wiki/45918/modifying-boundary-conditions
https://communities.bentley.com/products/geotech-analysis/w/plaxis-soilvision-wiki/45984/on-the-use-of-dynamic-boundary-conditions
Note that our Reference manual also contains lots of information about the boundary conditions, which you can find under the menu Help>Manual>Reference manual.