3D Mesoscale Model ------ Arch-Backfill Interaction Model FE mesh in ADAPTIC 15-noded wedge elements for the backfill 20-noded Brick elements for brick units Continuum domain with no interface elements Vertical Line load P ADAPTIC mesoscale FE mesh (interfaces) 16-noded interface elements For mortar joints 16-noded interface elements for the interface between arch barrel and the backfill
{}