Nongravity walls derive their capacity through lateral resistance, either by embedment
of vertical wall elements into firm ground, by anchorages provided by tiebacks,
by dowel actions provided by piles, or by caissons drilled into a stabilized zone. They
can be classified into, first, an externally stabilized system with embedded cantilever
wall elements, sheet piles, drilled shafts, or slurries; second, similar embedded walls
utilizing multiple anchorage tieback systems; and third, internally stabilized systems
such as creeping slopes externally covered with multianchored facings and internally
doweled with pile or caisson inclusions